Nikolai Piskunov

The Tartu Observatory Fiber-fed Echelle Spectrograph (TOFES) Data Reduction Pipeline

Borthakur, Sandipan P. D.; Eenmäe, Tõnis; Piskunov, Nikolai; Fossati, Luca et al.

Part of Publications of the Astronomical Society of the Pacific, 2026

• DOI for The Tartu Observatory Fiber-fed Echelle Spectrograph (TOFES) Data Reduction Pipeline
• Download full text (pdf) of The Tartu Observatory Fiber-fed Echelle Spectrograph (TOFES) Data Reduction Pipeline

VLT/CRIRES plus observations of warm Neptune WASP-107 b: Challenges in detecting molecules with ground-based transmission spectroscopy of cooler and cloudy exoplanets

Boldt-Christmas, Linn; Rains, Adam; Piskunov, Nikolai; Nortmann, L. et al.

Part of Astronomy and Astrophysics, 2026

• DOI for VLT/CRIRES plus observations of warm Neptune WASP-107 b: Challenges in detecting molecules with ground-based transmission spectroscopy of cooler and cloudy exoplanets
• Download full text (pdf) of VLT/CRIRES plus observations of warm Neptune WASP-107 b: Challenges in detecting molecules with ground-based transmission spectroscopy of cooler and cloudy exoplanets

PySME v1.0: Improved modelling of stellar spectra for survey-scale applications

Jian, Mingjie; Piskunov, Nikolai; Valenti, Jeff; Xi Wang, Ella et al.

Part of Astronomy and Astrophysics, 2026

• DOI for PySME v1.0: Improved modelling of stellar spectra for survey-scale applications
• Download full text (pdf) of PySME v1.0: Improved modelling of stellar spectra for survey-scale applications

Mass determination of the ultra-short-period planet LHS 3844 b First K-band radial velocity measurements with CRIRES+

Nagel, E.; Kohler, J.; Zechmeister, M.; Rains, Adam et al.

Part of Astronomy and Astrophysics, 2026

• DOI for Mass determination of the ultra-short-period planet LHS 3844 b First K-band radial velocity measurements with CRIRES+
• Download full text (pdf) of Mass determination of the ultra-short-period planet LHS 3844 b First K-band radial velocity measurements with CRIRES+

51 Peg b revisited with VLT/CRIRES+: Constraints on atmospheric thermal structure, chemical composition, and an alternative orbital solution

Cont, D.; Nortmann, L.; Lesjak, F.; Seemann, U. et al.

Part of Astronomy and Astrophysics, 2026

• DOI for 51 Peg b revisited with VLT/CRIRES+: Constraints on atmospheric thermal structure, chemical composition, and an alternative orbital solution
• Download full text (pdf) of 51 Peg b revisited with VLT/CRIRES+: Constraints on atmospheric thermal structure, chemical composition, and an alternative orbital solution

The Tartu Observatory Fiber-fed Echelle Spectrograph (TOFES) Data Reduction Pipeline

Borthakur, Sandipan P. D.; Eenmäe, Tõnis; Piskunov, Nikolai; Fossati, Luca et al.

Part of Publications of the Astronomical Society of the Pacific, 2026

• DOI for The Tartu Observatory Fiber-fed Echelle Spectrograph (TOFES) Data Reduction Pipeline
• Download full text (pdf) of The Tartu Observatory Fiber-fed Echelle Spectrograph (TOFES) Data Reduction Pipeline

VLT/CRIRES plus observations of warm Neptune WASP-107 b: Challenges in detecting molecules with ground-based transmission spectroscopy of cooler and cloudy exoplanets

Boldt-Christmas, Linn; Rains, Adam; Piskunov, Nikolai; Nortmann, L. et al.

Part of Astronomy and Astrophysics, 2026

• DOI for VLT/CRIRES plus observations of warm Neptune WASP-107 b: Challenges in detecting molecules with ground-based transmission spectroscopy of cooler and cloudy exoplanets
• Download full text (pdf) of VLT/CRIRES plus observations of warm Neptune WASP-107 b: Challenges in detecting molecules with ground-based transmission spectroscopy of cooler and cloudy exoplanets

PySME v1.0: Improved modelling of stellar spectra for survey-scale applications

Jian, Mingjie; Piskunov, Nikolai; Valenti, Jeff; Xi Wang, Ella et al.

Part of Astronomy and Astrophysics, 2026

• DOI for PySME v1.0: Improved modelling of stellar spectra for survey-scale applications
• Download full text (pdf) of PySME v1.0: Improved modelling of stellar spectra for survey-scale applications

Mass determination of the ultra-short-period planet LHS 3844 b First K-band radial velocity measurements with CRIRES+

Nagel, E.; Kohler, J.; Zechmeister, M.; Rains, Adam et al.

Part of Astronomy and Astrophysics, 2026

• DOI for Mass determination of the ultra-short-period planet LHS 3844 b First K-band radial velocity measurements with CRIRES+
• Download full text (pdf) of Mass determination of the ultra-short-period planet LHS 3844 b First K-band radial velocity measurements with CRIRES+

51 Peg b revisited with VLT/CRIRES+: Constraints on atmospheric thermal structure, chemical composition, and an alternative orbital solution

Cont, D.; Nortmann, L.; Lesjak, F.; Seemann, U. et al.

Part of Astronomy and Astrophysics, 2026

• DOI for 51 Peg b revisited with VLT/CRIRES+: Constraints on atmospheric thermal structure, chemical composition, and an alternative orbital solution
• Download full text (pdf) of 51 Peg b revisited with VLT/CRIRES+: Constraints on atmospheric thermal structure, chemical composition, and an alternative orbital solution

Cloudy with a chance of metals: Indications of CO2 in the atmosphere of GJ 1214 b from high-resolution K-band spectroscopy

Nortmann, L.; Cont, D.; Lesjak, F.; Rains, Adam et al.

Part of Astronomy and Astrophysics, 2026

• DOI for Cloudy with a chance of metals: Indications of CO2 in the atmosphere of GJ 1214 b from high-resolution K-band spectroscopy
• Download full text (pdf) of Cloudy with a chance of metals: Indications of CO2 in the atmosphere of GJ 1214 b from high-resolution K-band spectroscopy

Small-scale magnetic field effects on individual spectral line radial velocities in the photosphere and chromosphere of the Sun

Dorval, Patrick; Piskunov, Nikolai; de la Cruz Rodríguez, J.

Part of Astronomy and Astrophysics, 2026

• DOI for Small-scale magnetic field effects on individual spectral line radial velocities in the photosphere and chromosphere of the Sun
• Download full text (pdf) of Small-scale magnetic field effects on individual spectral line radial velocities in the photosphere and chromosphere of the Sun

Abundance analysis of benchmark M dwarfs

Olander, Terese; Heiter, Ulrike; Piskunov, Nikolai; Köhler, Jana et al.

Part of Astronomy and Astrophysics, 2025

• DOI for Abundance analysis of benchmark M dwarfs
• Download full text (pdf) of Abundance analysis of benchmark M dwarfs

Retrieving wind properties from the ultra-hot dayside of WASP-189 b with CRIRES⁺

Lesjak, F.; Nortmann, L.; Cont, D.; Yan, F. et al.

Part of Astronomy and Astrophysics, 2025

• DOI for Retrieving wind properties from the ultra-hot dayside of WASP-189 b with CRIRES⁺
• Download full text (pdf) of Retrieving wind properties from the ultra-hot dayside of WASP-189 b with CRIRES⁺

Retrieving day- and nightside atmospheric properties of the ultra-hot Jupiter TOI-2109b Detection of Fe and CO emission lines and evidence for inefficient heat transport

Cont, D.; Nortmann, L.; Lesjak, F.; Yan, F. et al.

Part of Astronomy and Astrophysics, 2025

• DOI for Retrieving day- and nightside atmospheric properties of the ultra-hot Jupiter TOI-2109b Detection of Fe and CO emission lines and evidence for inefficient heat transport
• Download full text (pdf) of Retrieving day- and nightside atmospheric properties of the ultra-hot Jupiter TOI-2109b Detection of Fe and CO emission lines and evidence for inefficient heat transport

viper: High-precision radial velocities from the optical to the infrared Reaching 3 m/s in the K band of CRIRES⁺ with telluric modelling

Koehler, J.; Zechmeister, M.; Hatzes, A.; Chamarthi, S. et al.

Part of Astronomy and Astrophysics, 2025

• DOI for viper: High-precision radial velocities from the optical to the infrared Reaching 3 m/s in the K band of CRIRES⁺ with telluric modelling
• Download full text (pdf) of viper: High-precision radial velocities from the optical to the infrared Reaching 3 m/s in the K band of CRIRES⁺ with telluric modelling

Comparative study of small-scale magnetic fields on ξ Boo A using optical and near-infrared spectroscopy

Hahlin, Axel; Kochukhov, Oleg; Chaturvedi, P.; Guenther, E. et al.

Part of Astronomy and Astrophysics, 2025

• DOI for Comparative study of small-scale magnetic fields on ξ Boo A using optical and near-infrared spectroscopy
• Download full text (pdf) of Comparative study of small-scale magnetic fields on ξ Boo A using optical and near-infrared spectroscopy

CRIRES⁺ transmission spectroscopy of WASP-127 b: Detection of the resolved signatures of a supersonic equatorial jet and cool poles in a hot planet

Nortmann, L.; Lesjak, F.; Yan, F.; Cont, D. et al.

Part of Astronomy and Astrophysics, 2025

• DOI for CRIRES⁺ transmission spectroscopy of WASP-127 b: Detection of the resolved signatures of a supersonic equatorial jet and cool poles in a hot planet
• Download full text (pdf) of CRIRES⁺ transmission spectroscopy of WASP-127 b: Detection of the resolved signatures of a supersonic equatorial jet and cool poles in a hot planet

Optimising spectroscopic observations of transiting exoplanets

Boldt-Christmas, Linn; Lesjak, Fabio; Wehrhahn, Ansgar; Piskunov, Nikolai et al.

Part of Astronomy and Astrophysics, 2024

• DOI for Optimising spectroscopic observations of transiting exoplanets
• Download full text (pdf) of Optimising spectroscopic observations of transiting exoplanets

The overflowing atmosphere of WASP-121 b High-resolution He I λ10833 transmission spectroscopy with VLT/CRIRES⁺

Czesla, S.; Nail, F.; Lavail, A.; Cont, D. et al.

Part of Astronomy and Astrophysics, 2024

• DOI for The overflowing atmosphere of WASP-121 b High-resolution He I λ10833 transmission spectroscopy with VLT/CRIRES⁺
• Download full text (pdf) of The overflowing atmosphere of WASP-121 b High-resolution He I λ10833 transmission spectroscopy with VLT/CRIRES⁺

A conclusive non-detection of magnetic field in the Am star o Peg with high-precision near-infrared spectroscopy

Kochukhov, O.; Amarsi, A. M.; Lavail, A.; Ruh, H. L. et al.

Part of Astronomy and Astrophysics, 2024

• DOI for A conclusive non-detection of magnetic field in the Am star o Peg with high-precision near-infrared spectroscopy
• Download full text (pdf) of A conclusive non-detection of magnetic field in the Am star o Peg with high-precision near-infrared spectroscopy

Secular stability of surface abundance structures in the rapidly rotating Ap star 56 Ari

Potravnov, I.; Piskunov, Nikolai; Ryabchikova, T.

Part of Astronomy and Astrophysics, 2024

• DOI for Secular stability of surface abundance structures in the rapidly rotating Ap star 56 Ari
• Download full text (pdf) of Secular stability of surface abundance structures in the rapidly rotating Ap star 56 Ari

The mean longitudinal magnetic field and its uses in radial-velocity surveys

Rescigno, F; Mortier, A; Dumusque, X; Lakeland, B S et al.

Part of Monthly notices of the Royal Astronomical Society, p. 2741-2762, 2024

• DOI for The mean longitudinal magnetic field and its uses in radial-velocity surveys
• Download full text (pdf) of The mean longitudinal magnetic field and its uses in radial-velocity surveys

Exploring the ultra-hot Jupiter WASP-178b

Cont, D.; Nortmann, L.; Yan, F.; Lesjak, F. et al.

Part of Astronomy and Astrophysics, 2024

• DOI for Exploring the ultra-hot Jupiter WASP-178b

Continuous ultraviolet to blue-green astrocomb

Cheng, Yuk Shan; Dadi, Kamalesh; Mitchell, Toby; Thompson, Samantha et al.

Part of Nature Communications, 2024

• DOI for Continuous ultraviolet to blue-green astrocomb
• Download full text (pdf) of Continuous ultraviolet to blue-green astrocomb

Retrieval of the dayside atmosphere of WASP-43b with CRIRES⁺

Lesjak, F.; Nortmann, L.; Yan, F.; Cont, D. et al.

Part of Astronomy and Astrophysics, 2023

• DOI for Retrieval of the dayside atmosphere of WASP-43b with CRIRES⁺
• Download full text (pdf) of Retrieval of the dayside atmosphere of WASP-43b with CRIRES⁺

Determination of small-scale magnetic fields on Sun-like stars in the near-infrared using CRIRES+

Hahlin, Axel; Kochukhov, Oleg; Rains, Adam; Lavail, Alexis et al.

Part of Astronomy and Astrophysics, 2023

• DOI for Determination of small-scale magnetic fields on Sun-like stars in the near-infrared using CRIRES+
• Download full text (pdf) of Determination of small-scale magnetic fields on Sun-like stars in the near-infrared using CRIRES+

Doppler imaging of a southern ApSi star HD 152564

Potravnov, I.; Ryabchikova, T.; Piskunov, Nikolai; Pakhomov, Y. et al.

Part of Monthly notices of the Royal Astronomical Society, p. 10376-10387, 2023

• DOI for Doppler imaging of a southern ApSi star HD 152564
• Download full text (pdf) of Doppler imaging of a southern ApSi star HD 152564

CRIRES+ detection of CO emissions lines and temperature inversions on the dayside of WASP-18b and WASP-76b

Yan, F.; Nortmann, L.; Reiners, A.; Piskunov, Nikolai et al.

Part of Astronomy and Astrophysics, 2023

• DOI for CRIRES+ detection of CO emissions lines and temperature inversions on the dayside of WASP-18b and WASP-76b
• Download full text (pdf) of CRIRES+ detection of CO emissions lines and temperature inversions on the dayside of WASP-18b and WASP-76b

CRIRES+ on sky at the ESO Very Large Telescope: Observing the Universe at infrared wavelengths and high spectral resolution

Dorn, R. J.; Bristow, P.; Smoker, J. V.; Rodler, F. et al.

Part of Astronomy and Astrophysics, 2023

• DOI for CRIRES+ on sky at the ESO Very Large Telescope: Observing the Universe at infrared wavelengths and high spectral resolution
• Download full text (pdf) of CRIRES+ on sky at the ESO Very Large Telescope: Observing the Universe at infrared wavelengths and high spectral resolution

PySME: Spectroscopy Made Easier

Wehrhahn, Ansgar; Piskunov, Nikolai; Ryabchikova, Tanja

Part of Astronomy and Astrophysics, 2023

• DOI for PySME: Spectroscopy Made Easier
• Download full text (pdf) of PySME: Spectroscopy Made Easier

Using Molecular Lines to Determine Carbon and Nitrogen Abundances in the Atmospheres of Cool Stars

Ryabchikova, Tatiana; Piskunov, Nikolai; Pakhomov, Yury

Part of Atoms, 2022

• DOI for Using Molecular Lines to Determine Carbon and Nitrogen Abundances in the Atmospheres of Cool Stars
• Download full text (pdf) of Using Molecular Lines to Determine Carbon and Nitrogen Abundances in the Atmospheres of Cool Stars

Accurate Short-Characteristics Radiative Transfer in A Numerical Tool for Astrophysical RESearch (ANTARES)

Kostogryz, Nadiia M.; Kupka, Friedrich; Piskunov, Nikolai; Fabbian, Damian et al.

Part of Solar Physics, 2021

• DOI for Accurate Short-Characteristics Radiative Transfer in A Numerical Tool for Astrophysical RESearch (ANTARES)
• Download full text (pdf) of Accurate Short-Characteristics Radiative Transfer in A Numerical Tool for Astrophysical RESearch (ANTARES)

Optimal extraction of echelle spectra: Getting the most out of observations

Piskunov, Nikolai; Wehrhahn, Ansgar; Marquart, Thomas

Part of Astronomy and Astrophysics, 2021

• DOI for Optimal extraction of echelle spectra: Getting the most out of observations
• Download full text (pdf) of Optimal extraction of echelle spectra: Getting the most out of observations

Evolution of brightness and magnetic features of young solar-type stars - I. The young G star HIP 89829

Perugini, G. M.; Marsden, S. C.; Waite, I. A.; Jeffers, S. et al.

Part of Monthly notices of the Royal Astronomical Society, p. 3304-3320, 2021

• DOI for Evolution of brightness and magnetic features of young solar-type stars - I. The young G star HIP 89829

A Decade with VAMDC: Results and Ambitions

Albert, Damien; Antony, Bobby K.; Ba, Yaye Awa; Babikov, Yuri L. et al.

Part of Atoms, 2020

• DOI for A Decade with VAMDC: Results and Ambitions
• Download full text (pdf) of A Decade with VAMDC: Results and Ambitions

Starspot activity of HD199178 Doppler images from 1994-2017

Hackman, T.; Ilyin, I.; Lehtinen, J. J.; Kochukhov, Oleg et al.

Part of Astronomy and Astrophysics, 2019

• DOI for Starspot activity of HD199178 Doppler images from 1994-2017

Model-free inverse method for transit imaging of stellar surfaces: Using transit surveys to map stellar spot coverage

Aronson, Erik; Piskunov, Nikolai

Part of Astronomy and Astrophysics, 2019

• DOI for Model-free inverse method for transit imaging of stellar surfaces: Using transit surveys to map stellar spot coverage

Hyperfine Splitting in the VALD Database of Spectral-line Parameters

Pakhomov, Yu; Ryabchikova, T. A.; Piskunov, Nikolai

Part of Astronomy reports (Print), p. 1010-1021, 2019

• DOI for Hyperfine Splitting in the VALD Database of Spectral-line Parameters

Evaluation of the Recent Atomic Data for Fe i Lines Based on Solar and Stellar Spectra

Ryabchikova, T.; Piskunov, Nikolai; Sitnova, T.

Part of Solar Physics, 2019

• DOI for Evaluation of the Recent Atomic Data for Fe i Lines Based on Solar and Stellar Spectra

Spot evolution on LQ Hya from 2006-2017: temperature maps based on SOFIN and FIES data

Cole-Kodikara, Elizabeth M.; Kaepylae, Maarit J.; Lehtinen, Jyri J.; Hackman, Thomas et al.

Part of Astronomy and Astrophysics, 2019

• DOI for Spot evolution on LQ Hya from 2006-2017: temperature maps based on SOFIN and FIES data
• Download full text (pdf) of Spot evolution on LQ Hya from 2006-2017: temperature maps based on SOFIN and FIES data

Long-term spot monitoring of the young solar analogue V889 Herculis

Willamo, T.; Hackman, T.; Lehtinen, J. J.; Kapyla, M. J. et al.

Part of Astronomy and Astrophysics, 2019

• DOI for Long-term spot monitoring of the young solar analogue V889 Herculis

VALD: The Meeting Point of Data Producers and Data Users

Ryabchikova, Tatiana; Pakhomov, Yury; Piskunov, Nikolai

Part of Galaxies, 2018

• DOI for VALD: The Meeting Point of Data Producers and Data Users
• Download full text (pdf) of VALD: The Meeting Point of Data Producers and Data Users

Model-independent Exoplanet Transit Spectroscopy

Aronson, Erik; Piskunov, Nikolai

Part of Astronomical Journal, 2018

• DOI for Model-independent Exoplanet Transit Spectroscopy

Inside a VAMDC data node-putting standards into practical software

Regandell, Samuel; Marquart, Thomas; Piskunov, Nikolai

Part of Physica Scripta, 2018

• DOI for Inside a VAMDC data node-putting standards into practical software

Spectroscopy Made Easy: Evolution

Piskunov, Nikolai; Valenti, Jeff A.

Part of Astronomy and Astrophysics, 2017

• DOI for Spectroscopy Made Easy: Evolution

The virtual atomic and molecular data centre (VAMDC) consortium

Dubernet, M. L.; Antony, B. K.; Ba, Y. A.; Babikov, Yu L. et al.

Part of Journal of Physics B, 2016

• DOI for The virtual atomic and molecular data centre (VAMDC) consortium
• Download full text (pdf) of The virtual atomic and molecular data centre (VAMDC) consortium

Spectral Properties Of Cool Stars: Extended Abundance Analysis Of 1,617 Planet-Search Stars

Brewer, John M.; Fischer, Debra A.; Valenti, Jeff A.; Piskunov, Nikolai

Part of Astrophysical Journal Supplement Series, 2016

• DOI for Spectral Properties Of Cool Stars: Extended Abundance Analysis Of 1,617 Planet-Search Stars

Accuracy of atmospheric parameters of FGK dwarfs determined by spectrum fitting

Ryabchikova, T.; Piskunov, Nikolai; Pakhomov, Yu.; Tsymbal, V. et al.

Part of Monthly notices of the Royal Astronomical Society, p. 1221-1234, 2016

• DOI for Accuracy of atmospheric parameters of FGK dwarfs determined by spectrum fitting

Scientific problems addressed by the Spektr-UV space project (world space Observatory-Ultraviolet)

Boyarchuk, A. A.; Shustov, B. M.; Savanov, I. S.; Sachkov, M. E. et al.

Part of Astronomy reports (Print), p. 1-42, 2016

• DOI for Scientific problems addressed by the Spektr-UV space project (world space Observatory-Ultraviolet)

The EChO science case

Tinetti, Giovanna; Drossart, Pierre; Eccleston, Paul; Hartogh, Paul et al.

Part of Experimental astronomy, p. 329-391, 2015

• DOI for The EChO science case
• Download full text (pdf) of The EChO science case

Magnetic field topology and chemical spot distributions in the extreme Ap star HD 75049

Kochukhov, Oleg; Rusomarov, Naum; Valenti, J. A.; Stempels, H. C. et al.

Part of Astronomy and Astrophysics, 2015

• DOI for Magnetic field topology and chemical spot distributions in the extreme Ap star HD 75049

A major upgrade of the VALD database

Ryabchikova, T.; Piskunov, Nikolai; Kurucz, R. L.; Stempels, Eric H. C. et al.

Part of Physica Scripta, 2015

• DOI for A major upgrade of the VALD database

Doppler imaging of LQ Hydrae for 1998-2002

Cole, E. M.; Hackman, T.; Kapyka, M. J.; Ilyin, I. et al.

Part of Astronomy and Astrophysics, 2015

• DOI for Doppler imaging of LQ Hydrae for 1998-2002

Serendipitous Discovery of a Dwarf Nova in the Kepler Field Near the G Dwarf Kic 5438845

Brown, Alexander; Neff, James E.; Ayres, Thomas R.; Kowalski, Adam et al.

Part of Astronomical Journal, 2015

• DOI for Serendipitous Discovery of a Dwarf Nova in the Kepler Field Near the G Dwarf Kic 5438845

Stellar activity as noise in exoplanet detection - I. Methods and application to solar-like stars and activity cycles

Korhonen, H.; Andersen, J. M.; Piskunov, Nikolai; Hackman, T. et al.

Part of Monthly notices of the Royal Astronomical Society, p. 3038-3052, 2015

• DOI for Stellar activity as noise in exoplanet detection - I. Methods and application to solar-like stars and activity cycles

Accurate Gravities of F, G, and K Stars from High Resolution Spectra Without External Constraints

Brewer, John M.; Fischer, Debra A.; Basu, Sarbani; Valenti, Jeff A. et al.

Part of Astrophysical Journal, 2015

• DOI for Accurate Gravities of F, G, and K Stars from High Resolution Spectra Without External Constraints

Using near-infrared spectroscopy for characterization of transiting exoplanets

Aronson, Erik; Waldén, P.; Piskunov, Nikolai

Part of Astronomy and Astrophysics, 2015

• DOI for Using near-infrared spectroscopy for characterization of transiting exoplanets

Three-dimensional magnetic and abundance mapping of the cool Ap star HD 24712 II. Two-dimensional magnetic Doppler imaging in all four Stokes parameters

Rusomarov, Naum; Kochukhov, Oleg; Ryabchikova, T.; Piskunov, Nikolai

Part of Astronomy and Astrophysics, 2015

• DOI for Three-dimensional magnetic and abundance mapping of the cool Ap star HD 24712 II. Two-dimensional magnetic Doppler imaging in all four Stokes parameters
• Download full text (pdf) of Three-dimensional magnetic and abundance mapping of the cool Ap star HD 24712 II. Two-dimensional magnetic Doppler imaging in all four Stokes parameters

Doppler images of DI Piscium during 2004-2006

Lindborg, M.; Hackman, T.; Mantere, M. J.; Korhonen, H. et al.

Part of Astronomy and Astrophysics, 2014

• DOI for Doppler images of DI Piscium during 2004-2006

Exploring the magnetic field complexity in M dwarfs at the boundary to full convection

Shulyak, D.; Reiners, A.; Seemann, U.; Kochukhov, Oleg et al.

Part of Astronomy and Astrophysics, 2014

• DOI for Exploring the magnetic field complexity in M dwarfs at the boundary to full convection

Are there tangled magnetic fields on HgMn stars?

Kochukhov, Oleg; Makaganiuk, Vitalii; Piskunov, Nikolai; Jeffers, S. V. et al.

Part of Astronomy and Astrophysics, 2013

• DOI for Are there tangled magnetic fields on HgMn stars?
• Download full text (pdf) of Are there tangled magnetic fields on HgMn stars?

Radial velocity signatures of Zeeman broadening

Reiners, A.; Shulyak, D.; Anglada-Escude, G.; Jeffers, S. V. et al.

Part of Astronomy and Astrophysics, 2013

• DOI for Radial velocity signatures of Zeeman broadening

Delo-bezier formal solutions of the polarized radiative transfer equation

Rodriguez, Jaime de la Cruz; Piskunov, Nikolai

Part of Astrophysical Journal, p. 33, 2013

• DOI for Delo-bezier formal solutions of the polarized radiative transfer equation

Magnetically Controlled Accretion on the Classical T Tauri Stars GQ Lupi and TW Hydrae

Johns-Krull, Christopher M.; Chen, Wei; Valenti, Jeff A.; Jeffers, Sandra V. et al.

Part of Astrophysical Journal, p. 11, 2013

• DOI for Magnetically Controlled Accretion on the Classical T Tauri Stars GQ Lupi and TW Hydrae

Three-dimensional magnetic and abundance mapping of the cool Ap star HD 24712: I. Spectropolarimetric observations in all four Stokes parameters

Rusomarov, Naum; Kochukhov, Oleg; Piskunov, Nikolai; Jeffers, S. V. et al.

Part of Astronomy and Astrophysics, 2013

• DOI for Three-dimensional magnetic and abundance mapping of the cool Ap star HD 24712: I. Spectropolarimetric observations in all four Stokes parameters
• Download full text (pdf) of Three-dimensional magnetic and abundance mapping of the cool Ap star HD 24712: I. Spectropolarimetric observations in all four Stokes parameters

M-dwarf metallicities: A high-resolution spectroscopic study in the near infrared

Önehag, Anna; Heiter, Ulrike; Gustafsson, Bengt; Piskunov, Nikolai et al.

Part of Astronomy and Astrophysics, 2012

• DOI for M-dwarf metallicities: A high-resolution spectroscopic study in the near infrared

Magnetism, chemical spots, and stratification in the HgMn star ϕ Phoenicis

Makaganiuk, Vitalii; Kochukhov, Oleg; Piskunov, Nikolai; Jeffers, Sandra et al.

Part of Astronomy and Astrophysics, 2012

• DOI for Magnetism, chemical spots, and stratification in the HgMn star ϕ Phoenicis

Doppler images of II Pegasi for 2004-2010

Hackman, T.; Mantere, M. J.; Lindborg, M.; Ilyin, I. et al.

Part of Astronomy and Astrophysics, 2012

• DOI for Doppler images of II Pegasi for 2004-2010

M2K. II. A Triple-Planet System Orbiting Hip 57274

Fischer, Debra A.; Gaidos, Eric; Howard, Andrew W.; Giguere, Matthew J. et al.

Part of Astrophysical Journal, p. 21, 2012

• DOI for M2K. II. A Triple-Planet System Orbiting Hip 57274

Multi-element Doppler imaging of the CP2 star HD 3980

Nesvacil, N.; Lüftinger, T.; Shulyak, D.; Obbrugger, M. et al.

Part of Astronomy and Astrophysics, 2012

• DOI for Multi-element Doppler imaging of the CP2 star HD 3980

THE NASA-UC ETA-EARTH PROGRAM. III. A SUPER-EARTH ORBITING HD 97658 AND A NEPTUNE-MASS PLANET ORBITING G1 785

Howard, Andrew W.; Johnson, John Asher; Marcy, Geoffrey W.; Fischer, Debra A. et al.

Part of Astrophysical Journal, p. 10, 2011

• DOI for THE NASA-UC ETA-EARTH PROGRAM. III. A SUPER-EARTH ORBITING HD 97658 AND A NEPTUNE-MASS PLANET ORBITING G1 785

The search for magnetic fields in mercury-manganese stars

Makaganiuk, Vitalii; Kochukhov, Oleg; Piskunov, Nikolai; Jeffers, S. V. et al.

Part of Astronomy and Astrophysics, 2011

• DOI for The search for magnetic fields in mercury-manganese stars

Doppler images of the RS CVn binary II Pegasi during the years 1994-2002

Lindborg, M.; Korpi, M. J.; Hackman, T.; Tuominen, I. et al.

Part of Astronomy and Astrophysics, 2011

• DOI for Doppler images of the RS CVn binary II Pegasi during the years 1994-2002

The Exoplanet Orbit Database

Wright, J. T.; Fakhouri, O.; Marcy, G. W.; Han, E. et al.

Part of Publications of the Astronomical Society of the Pacific, p. 412-422, 2011

The NASA-UC Eia-earth program. II. a planet orbiting HD 156668 with a minimum mass of four earth masses

Howard, Andrew W.; Johnson, John Asher; Marcy, Geoffrey W.; Fischer, Debra A. et al.

Part of Astrophysical Journal, p. 73, 2011

• DOI for The NASA-UC Eia-earth program. II. a planet orbiting HD 156668 with a minimum mass of four earth masses

No magnetic field in the spotted HgMn star mu Leporis

Kochukhov, Oleg; Makaganiuk, Vitalii; Piskunov, Nikolai; Jeffers, S. V. et al.

Part of Astronomy and Astrophysics, 2011

• DOI for No magnetic field in the spotted HgMn star mu Leporis

Analyzing low signal-to-noise FUSE spectra Confirmation of Lyman continuum escape from Haro 11

Leitet, Elisabet; Bergvall, Nils; Piskunov, Nikolai; Andersson, B. -G

Part of Astronomy and Astrophysics, 2011

• DOI for Analyzing low signal-to-noise FUSE spectra Confirmation of Lyman continuum escape from Haro 11

Chemical spots in the absence of magnetic field in the binary HgMn star 66 Eridani

Makaganiuk, Vitalii; Kochukhov, Oleg; Piskunov, Nikolai; Jeffers, S. V. et al.

Part of Astronomy and Astrophysics, 2011

• DOI for Chemical spots in the absence of magnetic field in the binary HgMn star 66 Eridani

Analyzing low signal-to-noise FUSE spectra: Confirmation of Lyman continuum escape from Haro 11

Leitet, Elisabet; Bergvall, Nils; Piskunov, Nikolai; Andersson, B.-G.

Part of Astronomy and Astrophysics, p. 107, 2011

• DOI for Analyzing low signal-to-noise FUSE spectra: Confirmation of Lyman continuum escape from Haro 11

Spot activity of II Peg

Hackman, T.; Mantere, M. J.; Jetsu, L.; Ilyin, I. et al.

Part of Astronomical Notes - Astronomische Nachrichten, p. 859-865, 2011

• DOI for Spot activity of II Peg

Rotation, magnetism and metallicity of M dwarf systems

Shulyak, D.; Seifahrt, A.; Reiners, A.; Kochukhov, Oleg et al.

Part of Monthly notices of the Royal Astronomical Society, p. 2548-2557, 2011

• DOI for Rotation, magnetism and metallicity of M dwarf systems

HARPSpol - The New Polarimetric Mode for HARPS

Piskunov, Nikolai; Snik, F.; Dolgopolov, A.; Kochukhov, Oleg et al.

Part of The Messenger, p. 7-10, 2011

First detection of linear polarization in the line profiles of active cool stars

Kochukhov, Oleg; Makaganiuk, Vitalii; Piskunov, Nikolai; Snik, F. et al.

Part of Astrophysical Journal Letters, 2011

• DOI for First detection of linear polarization in the line profiles of active cool stars

Virtual atomic and molecular data centre

Dubernet, M. L.; Boudon, V.; Culhane, J. L.; Dimitrijevic, M. S. et al.

Part of Journal of Quantitative Spectroscopy and Radiative Transfer, p. 2151-2159, 2010

• DOI for Virtual atomic and molecular data centre

Magnetic Doppler imaging of the roAp star HD 24712

Lueftinger, T.; Kochukhov, Oleg; Ryabchikova, T.; Piskunov, Nikolai et al.

Part of Astronomy and Astrophysics, 2010

• DOI for Magnetic Doppler imaging of the roAp star HD 24712

Surface structure of the CoRoT CP2 target star HD50773

Lueftinger, T.; Froehlich, H. -E; Weiss, W. W.; Petit, P. et al.

Part of Astronomy and Astrophysics, 2010

• DOI for Surface structure of the CoRoT CP2 target star HD50773

Least-squares deconvolution of the stellar intensity and polarization spectra

Kochukhov, Oleg; Makaganiuk, Vitalii; Piskunov, Nikolai

Part of Astronomy and Astrophysics, 2010

• DOI for Least-squares deconvolution of the stellar intensity and polarization spectra

Modelling the molecular Zeeman-effect in M-dwarfs: methods and first results

Shulyak, D.; Reiners, A.; Wende, S.; Kochukhov, Oleg et al.

Part of Astronomy and Astrophysics, 2010

• DOI for Modelling the molecular Zeeman-effect in M-dwarfs: methods and first results

Time-resolved photometric and spectroscopic analysis of the luminous Ap star HD 103498

Joshi, S.; Ryabchikova, T.; Kochukhov, Oleg; Sachkov, M. et al.

Part of Monthly notices of the Royal Astronomical Society, p. 1299-1307, 2010

• DOI for Time-resolved photometric and spectroscopic analysis of the luminous Ap star HD 103498

Detection of dusty plasma near the E-ring of Saturn

Wahlund, J.-E.; André, M.; Eriksson, A. I. E.; Lundberg, M. et al.

Part of Planetary and Space Science, p. 1795-1806, 2009

• DOI for Detection of dusty plasma near the E-ring of Saturn

THE NASA-UC ETA-EARTH PROGRAM:  I. A SUPER-EARTH ORBITING HD 7924

Howard, Andrew W.; Johnson, John Asher; Marcy, Geoffrey W.; Fischer, Debra A. et al.

Part of Astrophysical Journal, p. 75-83, 2009

• DOI for THE NASA-UC ETA-EARTH PROGRAM:  I. A SUPER-EARTH ORBITING HD 7924

VALD — an atomic and molecular database for astrophysics

Heiter, Ulrike; Barklem, Paul; Fossati, L.; Kildiyarova, R. et al.

Part of Journal of Physics, Conference Series, 2008

• DOI for VALD — an atomic and molecular database for astrophysics

A comparative analysis of the laboratory and theoretical transition probabilities of the Fe-peak elements for a new release of VALD

Ryabchikova, T.; Kildiyarova, R.; Piskunov, Nikolai; Heiter, Ulrike et al.

Part of Journal of Physics, Conference Series, 2008

• DOI for A comparative analysis of the laboratory and theoretical transition probabilities of the Fe-peak elements for a new release of VALD

Weather in stellar atmosphere revealed by the dynamics of mercury clouds in alpha Andromedae

Kochukhov, Oleg; Adelman, S.J.; Gulliver, A.F.; Piskunov, Nikolai

Part of Nature Physics, p. 526-529, 2007

• DOI for Weather in stellar atmosphere revealed by the dynamics of mercury clouds in alpha Andromedae

Atomic Diffusion and Mixing in Old Stars: I. Very Large Telescope FLAMES-UVES Observations of Stars in NGC 6397

Korn, Andreas; Grundahl, Frank; Richard, Olivier; Mashonkina, Lyudmila et al.

Part of Astrophysical Journal, p. 402-419, 2007

• DOI for Atomic Diffusion and Mixing in Old Stars: I. Very Large Telescope FLAMES-UVES Observations of Stars in NGC 6397

A probable stellar solution to the cosmological lithium discrepancy

Korn, Andreas; Grundahl, Frank; Richard, O.; Barklem, Paul et al.

Part of Nature, p. 657-659, 2006

• DOI for A probable stellar solution to the cosmological lithium discrepancy

Inhomogeneous distribution of mercury on the surfaces of rapidly rotating HgMn stars

Kochukhov, Oleg; Piskunov, Nikolai; Sachkov, M.; Kudryavtsev, D.

Part of Astronomy & Astrophysics, p. 1093, 2005

The influence of magnetic fields on the hydrostatic structure of the atmospheres of chemically peculiar stars

Valyavin, G.; Kochukhov, Oleg; Piskunov, Nikolai

Part of Astronomy & Astrophysics, p. 933, 2004

Magnetic Doppler imaging of 53 Camelopardalis in all four Stokes parameters

Kochukhov, Oleg; Bagnulo, S.; Wade, G. A.; Sangalli, L. et al.

Part of Astronomy & Astrophysics, p. 613, 2004

Multi-element abundance Doppler imaging of the rapidly oscillating Ap star HR 3831

Kochukhov, Oleg; Drake, N.; Piskunov, Nikolai; de la Reza, R.

Part of Astronomy & Astrophysics, p. 935, 2004

No magnetic field variation with pulsation phase in the roAp star gamma Equulei

Kochukhov, Oleg; Ryabchikova, T.; Piskunov, Nikolai

Part of Astronomy & Astrophysics, p. 13, 2004

Near-Polar Starspots and Polar Dynamo Waves

Novikov, S.V.; Piskunov, Nikolai; Sokoloff, D.D.

Part of Astronomy Reports, p. 522, 2004

He and Si surface inhomogeneities of four Bp variable stars

Briquet, M.; Aerts, C.; Lüftinger, T.; De Cat, P. et al.

Part of Astronomy & Astrophysics, p. 273, 2004

The Photosphere and Veiling Spectrum of T Tauri Stars

Stempels, Eric H.C.; Piskunov, Nikolai

Part of Astronomy and Astrophysics, p. 693-706, 2003

• DOI for The Photosphere and Veiling Spectrum of T Tauri Stars

PEPSI spectro-polarimeter for the LBT

Strassmeier, K.G.; Hofmann, A.; Woche, M.; Rice, J. et al.

Part of SPIE: Polarimetery in Astronomy, p. 180, 2003

Doppler Imaging of the Ap star epsilon Ursae Majoris: Ca, Cr, Fe, Mg, Mn, Ti, Sr

Lueftinger, T.; Kuschnig, R.; Piskunov, Nikolai; Weiss, W. W.

Part of Astronomy & Astrophysics, p. 1033, 2003

Doppler Imaging of stellar magnetic fields. II. Numerical experiments

Kochukhov, Oleg; Piskunov, Nikolai

Part of Astronomy and Astrophysics, p. 868-888, 2002

Detailed analysis of Balmer lines in cool dwarf stars

Barklem, Paul; Stempels, H.C.; Allende Prieto, C.; Kochukhov, Oleg et al.

Part of Astronomy & Astrophysics, p. 951, 2002

Doppler Imaging of stellar magnetic fields. III. Abundance distribution and magnetic field geometry of alpha 2 CVn

Kochukhov, Oleg; Piskunov, Nikolai; Ilyin, I.; Ilyina, S. et al.

Part of Astronomy and Astrophysics, p. 420-438, 2002

Spectroscopy of T Tauri stars with UVES. Observations and analysis of RU Lup

Stempels, H.C.; Piskunov, Nikolai

Part of Astronomy & Astrophysics, p. 595, 2002

Nonaxisymmetric cool spot distributions and dynamo action in close binaries

Moss, D.; Piskunov, Nikolai; Sokoloff, D.

Part of Astronomy & Astrophysics, p. 885, 2002

Swing excitation and magnetic activity in close binary systems

Sokoloff, D.; Piskunov, Nikolai

Part of Monthly Notices of RAS, p. 925, 2002

Spectropolarimetry of starspots

Piskunov, Nikolai

Part of Astronomische Nachrichten, p. 257-259, 2002

New algorithms for reducing cross-dispersed echelle spectra

Piskunov, Nikolai; Valenti, J.

Part of Astronomy & Astrophysics, p. 1095, 2002

Abundance stratification and pulsation in the atmosphere of the roAp star gamma Equulei

Ryabchikova, T.; Piskunov, Nikolai; Kochukhov, Oleg; Tsymbal, V. et al.

Part of Astronomy & Astrophysics, p. 545, 2002

Doppler Imaging of stellar magnetic fields. I. Techniques

Piskunov, Nikolai; Kochukhov, Oleg

Part of Astronomy & Astrophysics, p. 736, 2002

LTE spectrum synthesis in magnetic stellar atmospheres - The interagreement of three independent polarised radiative transfer codes

Wade, GA; Bagnulo, S; Kochukhov, Oleg; Landstreet, JD et al.

Part of Astronomy & Astrophysics, p. 265-279, 2001

Formation of Fe x-Fe XIV coronal lines in the accretion shock of T Tauri stars

Lamzin, SA; Stempels, HC; Piskunov, Nikolai

Part of Astronomy & Astrophysics, p. 965-970, 2001

Model atmospheres with individualized abundances

Piskunov, Nikolai; Kupka, F

Part of Astrophysical Journal, p. 1040-1056, 2001

The core-wing anomaly of cool Ap stars - Abnormal Balmer profiles

Cowley, C.R.; Hubrig, S.; Ryabchikova, T.A.; Mathys, G. et al.

Part of Astronomy & Astrophysics, p. 939-942, 2001

The Three-dimensional Structure of the Warm Local Interstellar Medium. I. Methodology

Linsky, J. L; Redfield, S; Wood, B. E; Piskunov, Nikolai

Part of Astrophysical Journal, p. 756, 2000

• DOI for The Three-dimensional Structure of the Warm Local Interstellar Medium. I. Methodology

A list of data for the broadening of metallic lines by neutral hydrogen collisions

Barklem, Paul; Piskunov, Nikolai; O'Mara, BJ

Part of ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES, p. 467-473, 2000

Self broadening of hydrogen lines: initial results

Barklem, Paul; Piskunov, Nikolai; O'Mara, BJ

Part of ASTRONOMY AND ASTROPHYSICS, 2000

Self-broadening in Balmer line wing formation in stellar atmospheres

Barklem, Paul; Piskunov, Nikolai; O'Mara, BJ

Part of ASTRONOMY AND ASTROPHYSICS, p. 1091-1105, 2000

VALD-2: Progress of the Vienna Atomic Line Data Base

Kupka, F.; Piskunov, Nikolai; Ryabchikova, T. A.; Stempels, H. C. et al.

Part of Astronomy and Astrophysics Supplement Series, p. 119-133, 1999

• DOI for VALD-2: Progress of the Vienna Atomic Line Data Base

The Vienna Atomic Line Data Base - a status report

Ryabchikova, T. A.; Piskunov, Nikolai; Stempels, H. C.; Kupka, F. et al.

Part of Physica scripta. T, p. 162-173, 1999

• DOI for The Vienna Atomic Line Data Base - a status report

Multi element Doppler imaging of Ap stars I. He, Mg, Si, Cr and Fe surface distribution for CU Virginis

Kuschnig, R; Ryabchikova, TA; Piskunov, Nikolai; Weiss, WW et al.

Part of Astronomy & Astrophysics, p. 924-932, 1999

Eu III identification and Eu abundance in CP stars

Ryabchikova, T; Piskunov, Nikolai; Savanov, I; Kupka, F et al.

Part of Astronomy & Astrophysics, p. 229-236, 1999

Spectral synthesis of TiO lines

Valenti, JA; Piskunov, Nikolai; Johns-Krull, CM

Part of Astrophysical Journal, p. 851-862, 1998

Local interstellar medium properties and deuterium abundances for the lines of sight toward HR 1099, 31 Comae, beta Ceti, and beta Cassiopeiae

Piskunov, Nikolai; Wood, BE; Linsky, JL; Dempsey, RC et al.

Part of Astrophysical Journal, p. 315-328, 1997

Spectroscopy made easy: A new tool for fitting observations with synthetic spectra

Valenti, JA; Piskunov, Nikolai

Part of Astronomy & Astrophysics Supplement Series, p. 595-603, 1996

New Abundances for Old Stars – Atomic Diffusion at Work in NGC 6397

Korn, Andreas J.; Grundahl, Frank; Richard, Olivier; Barklem, Paul et al.

Part of The Messenger, p. 6-10, 2006

Continuous Ultraviolet to Blue-Green Astrocomb

Cheng, Yuk Shan; Dadi, Kamalesh; Mitchell, Toby; Thompson, Samantha et al.

Part of Proceedings, 2024

• DOI for Continuous Ultraviolet to Blue-Green Astrocomb

The Polarimetric Performance of HARPS3 and Its Impact on the Terra Hunting Experiment Scheduling

Dorval, Patrick; Politopoulos, Ioannis; Nicholson, Belinda; ter Horst, Rik et al.

Part of Ground-Based and Airborne Instrumentation for Astronomy X, 2024

• DOI for The Polarimetric Performance of HARPS3 and Its Impact on the Terra Hunting Experiment Scheduling

ANDES, the high resolution spectrograph for the ELT: evolution of the Fiber-Link subsystem after the System Architecture Review

Brucalassi, A.; Tozzi, A.; Oliva, E.; Araiza-Duran, J. A. et al.

Part of Ground-Based and Airborne Instrumentation for Astronomy X, 2024

• DOI for ANDES, the high resolution spectrograph for the ELT: evolution of the Fiber-Link subsystem after the System Architecture Review

MOSAIC at the ELT: a unique instrument for the largest ground-based telescope

Pello, Roser; Puech, Mathieu; Prieto, Eric; Rodrigues, Myriam et al.

Part of Ground-Based and Airborne Instrumentation for Astronomy X, 2024

• DOI for MOSAIC at the ELT: a unique instrument for the largest ground-based telescope

ANDES, the high resolution spectrograph for the ELT: science goals, project overview and future developments

Marconi, A.; Abreu, M.; Adibekyan, V; Alberti, V et al.

Part of Ground-Based and Airborne Instrumentation for Astronomy X, 2024

• DOI for ANDES, the high resolution spectrograph for the ELT: science goals, project overview and future developments

ANDES, the high-resolution spectrograph for the ELT: a 30 GHz UB-band astrocomb from 390-470 nm

Cheng, Yuk Shan; Dadi, Kamalesh; Mitchell, Toby; Thompson, Samantha et al.

Part of Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation VI, 2024

• DOI for ANDES, the high-resolution spectrograph for the ELT: a 30 GHz UB-band astrocomb from 390-470 nm

End-to-End simulation framework for astronomical spectrographs: SOXS, CUBES and ANDES

Scaudo, A.; Genoni, M.; Li Causi, G.; Cabona, L. et al.

Part of Modeling, Systems Engineering, and Project Management for Astronomy XI, 2024

• DOI for End-to-End simulation framework for astronomical spectrographs: SOXS, CUBES and ANDES

CRIRES+ on sky: High spectral resolution at infrared wavelength enabling better science at the ESO VLT

Dorn, Reinhold J.; Bristow, Paul; Smoker, Jonathan; Rodler, Florian et al.

Part of Ground-Based And Airborne Instrumentation For Astronomy IX, 2022

• DOI for CRIRES+ on sky: High spectral resolution at infrared wavelength enabling better science at the ESO VLT

CRIRES+: Characterisation and preparation during the pandemic

Bristow, Paul; Baruffolo, Andrea; Smoker, Jonathan; Rodler, Florian et al.

Part of Ground-based and Airborne Instrumentation for Astronomy IX, 2022

• DOI for CRIRES+: Characterisation and preparation during the pandemic

ELT-HIRES, the high resolution spectrograph for the ELT: Phase A study and path to construction

Marconi, Alessandro; Abreu, M.; Adibekyan, V; Aliverti, M. et al.

Part of Ground-based and Airborne Instrumentation for Astronomy VIII, 2020

• DOI for ELT-HIRES, the high resolution spectrograph for the ELT: Phase A study and path to construction

A unique infrared spectropolarimetric unit for CRIRES+

Piskunov, Nikolai; Stempels, Eric; Lavail, Alexis; Escuti, Michael et al.

Part of GROUND-BASED AND AIRBORNE INSTRUMENTATION FOR ASTRONOMY VII, 2018

• DOI for A unique infrared spectropolarimetric unit for CRIRES+

ELT-HIRES, the high resolution spectrograph for the ELT: results from the Phase A study

Marconi, A.; Prieto, C. Allende; Amado, P. J.; Amate, M. et al.

Part of GROUND-BASED AND AIRBORNE INSTRUMENTATION FOR ASTRONOMY VII, 2018

• DOI for ELT-HIRES, the high resolution spectrograph for the ELT: results from the Phase A study

Analysis of the polarimetric performance of the HARPS3 Cassegrain adaptor unit

Dorval, Patrick; Snik, Frans; Piskunov, Nikolai; Navarro, Ramon et al.

Part of Ground-Based And Airborne Instrumentation For Astronomy VII, 2018

• DOI for Analysis of the polarimetric performance of the HARPS3 Cassegrain adaptor unit

Full System Test and early Preliminary Acceptance Europe results for CRIRES

Brucalassi, Anna; Dorn, Reinhold J.; Follert, Roman; Hatzes, Artie et al.

Part of Ground-Based And Airborne Instrumentation For Astronomy VII, 2018

• DOI for Full System Test and early Preliminary Acceptance Europe results for CRIRES

Deriving stellar parameters with the SME software package

Piskunov, Nikolai

Part of Second brite-constellation science conference, p. 209-213, 2017

Main High-Resolution Near-IR Spectrometer for the VLT

Piskunov, Nikolai

Part of Stars, p. 514-517, 2017

VALD3: Current Developments

Pakhomov, Yu; Piskunov, Nikolai; Ryabchikova, T

Part of Stars, p. 518-521, 2017

Program Package for the Analysis of High Resolution High Signal-To-Noise Stellar Spectra

Piskunov, Nikolai; Ryabchikova, T.; Pakhomov, Yu.; Sitnova, T. et al.

Part of Stars, p. 509-513, 2017

Characterizing the cross dispersion reflection gratings of CRIRES

Follert, Roman; Taubert, Dieter; Hollandt, Joerg; Monte, Christian et al.

Part of Advances In Optical And Mechanical Technologies For Telescopes And Instrumentation Ii, 2016

• DOI for Characterizing the cross dispersion reflection gratings of CRIRES

EELT-HIRES the high-resolution spectrograph for the E-ELT

Marconi, A.; Di Marcantonio, P.; D'Odorico, V.; Cristiani, S. et al.

Part of GROUND-BASED AND AIRBORNE INSTRUMENTATION FOR ASTRONOMY VI, 2016

• DOI for EELT-HIRES the high-resolution spectrograph for the E-ELT

4MOST: the 4-metre Multi-Object Spectroscopic Telescope project at preliminary design review

de Jong, Roelof S.; Barden, Samuel C.; Bellido-Tirado, Olga; Brynnel, Joar G. et al.

Part of GROUND-BASED AND AIRBORNE INSTRUMENTATION FOR ASTRONOMY VI, 2016

• DOI for 4MOST: the 4-metre Multi-Object Spectroscopic Telescope project at preliminary design review

The " plus " for CRIRES: enabling better science at infrared wavelength and high spectral resolution at the ESO VLT

Dorn, Reinhold J.; Follert, Roman; Bristow, Paul; Cumani, Claudio et al.

Part of GROUND-BASED AND AIRBORNE INSTRUMENTATION FOR ASTRONOMY VI, 2016

• DOI for The " plus " for CRIRES: enabling better science at infrared wavelength and high spectral resolution at the ESO VLT

HARS3 for a Roboticized Isaac Newton Telescope

Thompson, Samantha J.; Queloz, Didier; Baraffe, Isabelle; Brake, Martyn et al.

Part of GROUND-BASED AND AIRBORNE INSTRUMENTATION FOR ASTRONOMY VI, 2016

• DOI for HARS3 for a Roboticized Isaac Newton Telescope

On the Accuracy of Atmospheric Parameter Determination in BAFGK Stars

Ryabchikova, T.; Piskunov, Nikolai; Shulyak, D.

Part of PHYSICS AND EVOLUTION OF MAGNETIC AND RELATED STARS, p. 308-319, 2015

Magnetic fields of Ap stars from full Stokes spectropolarimetric observations

Rusomarov, Naum; Kochukhov, Oleg; Piskunov, Nikolai

Part of PUTTING A STARS INTO CONTEXT, p. 380-385, 2014

Wavelength calibration from 1-5 mu m for the CRIRES plus high-resolution spectrograph at the VLT

Seemann, U.; Anglada-Escude, G.; Baade, D.; Bristow, P. et al.

Part of GROUND-BASED AND AIRBORNE INSTRUMENTATION FOR ASTRONOMY V, 2014

• DOI for Wavelength calibration from 1-5 mu m for the CRIRES plus high-resolution spectrograph at the VLT

Methodology for measuring fundamental parameters and associated uncertainties for middle and cool main-sequence stars

Piskunov, Nikolai; Ryabchikova, T.; Titarenko, A.; Pakhomov, Yu et al.

Part of PUTTING A STARS INTO CONTEXT, p. 130-135, 2014

CRIRES plus: a cross-dispersed high-resolution infrared spectrograph for the ESO VLT

Follert, R.; Dorn, R. J.; Oliva, E.; Lizon, J. L. et al.

Part of GROUND-BASED AND AIRBORNE INSTRUMENTATION FOR ASTRONOMY V, 2014

• DOI for CRIRES plus: a cross-dispersed high-resolution infrared spectrograph for the ESO VLT

HIRES: The High Resolution Spectrograph for E-ELT

Zerbi, F. M.; Bouchy, F.; Fynbo, J.; Maiolino, R. et al.

Part of Ground-based and Airborne Instrumentation for Astronomy V, 2014

• DOI for HIRES: The High Resolution Spectrograph for E-ELT

Concept and optical design of the cross-disperser module for CRIRES+

Oliva, E.; Tozzi, A.; Ferruzzi, D.; Origlia, L. et al.

Part of GROUND-BASED AND AIRBORNE INSTRUMENTATION FOR ASTRONOMY V, 2014

• DOI for Concept and optical design of the cross-disperser module for CRIRES+

Novel infrared polarimeter for the ESO CRIRES plus instrument

Lockhart, Matthew; Piskunov, Nikolai; Stempels, Eric; Escuti, Michael et al.

Part of GROUND-BASED AND AIRBORNE INSTRUMENTATION FOR ASTRONOMY V, 2014

• DOI for Novel infrared polarimeter for the ESO CRIRES plus instrument

Upgrading CRIRES-VLT to cross-dispersed mode

Oliva, E.; Hatzes, A.; Piskunov, Nikolai; Reiners, A. et al.

Part of Proceedings of SPIE, 2012

• DOI for Upgrading CRIRES-VLT to cross-dispersed mode

Magnetic Fields of M-Dwarfs from the Molecular and Atomic Diagnostics

Shulyak, D.; Reiners, A.; Wende, S.; Kochukhov, Oleg et al.

Part of Magnetic Stars, p. 280-290, 2011

The HARPS Polarimeter

Snik, F.; Kochukhov, Oleg; Piskunov, Nikolai; Rodenhuis, M. et al.

Part of Solar Polarization 6, 2011

VAMDC: The Virtual Atomic and Molecular Data Center

Walton, N. A.; Dubernet, M. L.; Mason, N. J.; Piskunov, Nikolai et al.

Part of Astronomical Data Analysis Software and Systems XX, 2011

The search for magnetic fields in mercury-manganese stars

Makaganiuk, Vitalii; Kochukhov, Oleg; Piskunov, Nikolai; Jeffers, Sandra V. et al.

Part of Active OB stars, p. 202-203, 2011

• DOI for The search for magnetic fields in mercury-manganese stars

Kepler Observations of Starspot Evolution, Differential Rotation, and Flares on Late-Type Stars

Brown, A.; Korhonen, H.; Berdyugina, S.; Walkowicz, L. et al.

Part of American Astronomical Society Meeting Abstracts #218, 2011

Starspot variability and evolution from modeling Kepler photometry of active late-type stars

Brown, A.; Korhonen, H.; Berdyugina, S.; Tofany, B. et al.

Part of IAU Symposium 273 (The Physics of Sun and Star Spots), p. 78-82, 2011

• DOI for Starspot variability and evolution from modeling Kepler photometry of active late-type stars

VAMDC: The Virtual Atomic and Molecular Data Centre: a Service Orientated Data Infrastructure for e- Research

Mason, N. J.; Dubernet, M. L.; Benson, K. M.; Bureau, J. et al.

Part of European Planetary Science Congress 2010, 2010

Magnetic fields in M dwarf stars from high-resolution infrared spectra

Kochukhov, Oleg; Heiter, Ulrike; Piskunov, Nikolai; Ryde, N. et al.

Part of COOL STARS, STELLAR SYSTEMS AND THE SUN: Proceedings of the 15th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun, p. 124-129, 2009

• DOI for Magnetic fields in M dwarf stars from high-resolution infrared spectra

Optimal Extraction of Echelle Spectra

Piskunov, Nikolai

Part of Precision Spectroscopy in Astrophysics, p. 129-132, 2007

• DOI for Optimal Extraction of Echelle Spectra

3-D Hydrodynamic Simulation of Convection in A Stars

Kochukhov, Oleg; Freytag, Bernd; Piskunov, Nikolai; Steffen, M.

Part of IAUS 239, Convection in Astrophysics, p. 68-70, 2007

• DOI for 3-D Hydrodynamic Simulation of Convection in A Stars

Pinning Down Gravitational Settling

Korn, Andreas; Piskunov, Nikolai; Barklem, Paul; Gustafsson, Bengt

Part of Chemical Abundances and Mixing in Stars in the Milky Way and its Satellites, p. 294, 2006

• DOI for Pinning Down Gravitational Settling

Magnetic Doppler Imaging of Active Stars

Kochukhov, Oleg; Piskunov, Nikolai

Part of Solar and Stellar Activity Cycles, 26th meeting of the IAU, Joint Discussion 8, 2006

Cool stars in the Gaia photometric system

Heiter, Ulrike; Piskunov, Nikolai; Gustafsson, Bengt; Jordi, C. et al.

Part of 13th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun, p. 635, 2005

Magnetic Fields and Stellar Surface Structures

Piskunov, Nikolai

Part of High Resolution Infrared Spectroscopy in Astronomy, p. 315, 2005

Magnetic Doppler Imaging: Mathematical Basis

Piskunov, Nikolai

Part of EAS Publication series, vol. 17, p. 245, 2005

Magnetic Doppler imaging of early-type stars

Piskunov, Nikolai; Kochukhov, Oleg

Part of Magnetic Fields in O, B and A Stars: Origin and Connection to Pulsation, Rotation and Mass Loss, ASP. Conf. Ser., vol. 305, p. 83, 2003

Magnetic Doppler Imaging of Chemically Peculiar Stars

Kochukhov, Oleg; Piskunov, Nikolai; Bagnulo, S.; Landstreet, J.D. et al.

Part of The 3rd Solar Polarization Workshop, ASP conf. Ser., vol. 307, p. 549, 2003

Balmer lines and effective temperatures in cool stars

Barklem, Paul; Stempels, H.C.; Kochukhov, Oleg; Piskunov, Nikolai et al.

Part of 12th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun, p. 1103, 2003

Magnetic Doppler imaging of solar-type stars

Piskunov, Nikolai; Kochukhov, Oleg

Part of The 3rd Solar Polarization Workshop, ASP conf. Ser., vol. 307, p. 539, 2003

The influence of global magnetic field evolution on the structure of atmospheres of early-type stars

Valyavin, G.; Kochukhov, Oleg; Piskunov, Nikolai

Part of IAUS 210, Modelling of stellar atmospheres, 2003

Probing Magnetospheric Infall onto CTTS with Time-resolved Veiling Measurements

Stempels, H.C.; Piskunov, Nikolai

Part of 12th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun, p. 735, 2003

Hydrogen Balmer Lines as Probes of Stellar Atmospheres

Barklem, Paul; Piskunov, Nikolai

Part of IAUS 210, Modelling of stellar atmospheres, 2003

Parametric Resonance and Magnetic Activity in Close Binary Systems

Sokoloff, D.D.; Piskunov, Nikolai

Part of IAUS 210, Modelling of stellar atmospheres, 2003

Tools and Methods for Abundance Analysis

Knoglinger, P.; Nesvacil, N.; Kupka, F.; Mittermayer, P. et al.

Part of IAUS 210, Modelling of stellar atmospheres, 2003

Spectroscopy of rapidly oscillating Ap stars

Piskunov, Nikolai; Kochukhov, Oleg

Part of Radial and Nonradial Pulsations as Probes of Stellar Physics, ASP Conf. Ser., vol. 259, p. 280, 2002

The Search and Modelling of Magnetic Fields on M Dwarfs

Kochukhov, Oleg; Piskunov, Nikolai; Valenti, J.; Johns-Krull, C.

Part of Magnetic Fields Across the Hertzsprung-Russell Diagram, Conference Proceedings, p. 219, 2001

Time-Resolved Spectroscopy of the roAp Star gamma Equ

Kochukhov, Oleg; Ryabchikova, T.; Piskunov, Nikolai

Part of Magnetic Fields Across the Hertzsprung-Russell Diagram, Conference Proceedings, p. 341, 2001

Hydrogen Line Formation in Cool Stars

Barklem, Paul; Kochukhov, Oleg; Piskunov, Nikolai; O'Mara, B. J. et al.

Part of 11th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun, p. 766, 2001

Magnetic Doppler Imaging of alpha2 CVn

Kochukhov, O; Piskunov, Nikolai; Ilyin, I.; Ilyina, S. et al.

Part of Magnetic Fields Across the Hertzsprung-Russell Diagram, Conference Proceedings, p. 321, 2001

Recent Developments of the VALD Database

Stempels, H.C.; Piskunov, Nikolai; Barklem, Paul

Part of 11th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun, p. 878, 2001

New Measurements of T Tauri Magnetic Fields: Testing Magnetospheric Accretion

Johns-Krull, C.M.; Valenti, J.A.; Piskunov, Nikolai; Saar, S. et al.

Part of Magnetic Fields Across the Hertzsprung-Russell Diagram, ASP Conf. Ser., vol. 248, p. 527, 2001

Magnetic Doppler Imaging of Chemically Peculiar Stars

Piskunov, Nikolai; Kochukhov, Oleg

Part of Astrotomography, Indirect Imaging Methods in Observational Astronomy, Lecture Notes in Physics, p. 238, 2001

Chemical Stratification in Magnetic Ap Stars

Wade, G.A.; Ryabchikova, T.; Bagnulo, S.; Piskunov, Nikolai

Part of Magnetic Fields Across the Hertzsprung-Russell Diagram, ASP Conf. Ser., vol. 248, p. 373, 2001

Doppler Imaging of Eclipsing Binary Systems ER Vul and TY Pyx

Piskunov, Nikolai; Vincent, A.; Duemmler, R.; Ilyin, I. et al.

Part of 11th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun, ASP Conf. Ser., vol. 223, p. 1285, 2001

Using FeH to Measure Magnetic Fields on Cool Stars and Brown Dwarfs

Valenti, J.A.; Johns-Krull, C.M.; Piskunov, Nikolai

Part of 11th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun, ASP Conf. Ser., vol. 223, p. 1579, 2001

Magnetic Doppler Imaging of CP Stars

Piskunov, Nikolai

Part of Magnetic Fields Across the Hertzsprung-Russell Diagram, ASP Conf. Ser., vol. 248, p. 293, 2001

A Fiber-Linked Four Stokes-Parameter Polarimeter for the SOFIN Spectrometer on the Nordic Optical Telescope

Pettersson, Bertil; Stempels, Eric; Piskunov, Nikolai

Part of Fiber Optics in Astronomy III, p. 343, 1998

Modelling of Stellar Atmospheres

Piskunov, Nikolai; Gray, D.F.; Weiss, W.W.

2003

CRIRES+ detection of H₂O and CO in the transmission spectra of WASP-107 b

Wehrhahn, Ansgar; Boldt-Christmas, Linn; Rains, Adam D.; Piskunov, Nikolai et al.

2022

VLT/CRIRES+ observations of warm Neptune WASP-107 b: Molecular detections and challenges in ground-based transmission spectroscopy of cooler and cloudy exoplanets

Boldt-Christmas, Linn; Rains, Adam D.; Piskunov, Nikolai; Nortmann, L. et al.

Detectability of a habitable TRAPPIST-1 e: Simulated climate scenarios as seen through transmission spectroscopy with ELT and JWST

Boldt-Christmas, Linn; Krilanovic, Marija; Way, Michael J.; Piskunov, Nikolai