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.

Ingår i Publications of the Astronomical Society of the Pacific, 2026

• DOI för The Tartu Observatory Fiber-fed Echelle Spectrograph (TOFES) Data Reduction Pipeline
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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.

Ingår i Astronomy and Astrophysics, 2026

• DOI för VLT/CRIRES plus observations of warm Neptune WASP-107 b: Challenges in detecting molecules with ground-based transmission spectroscopy of cooler and cloudy exoplanets
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PySME v1.0: Improved modelling of stellar spectra for survey-scale applications

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

Ingår i Astronomy and Astrophysics, 2026

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

Ingår i Astronomy and Astrophysics, 2026

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

Ingår i Astronomy and Astrophysics, 2026

• DOI för 51 Peg b revisited with VLT/CRIRES+: Constraints on atmospheric thermal structure, chemical composition, and an alternative orbital solution
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The Tartu Observatory Fiber-fed Echelle Spectrograph (TOFES) Data Reduction Pipeline

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

Ingår i Publications of the Astronomical Society of the Pacific, 2026

• DOI för The Tartu Observatory Fiber-fed Echelle Spectrograph (TOFES) Data Reduction Pipeline
• Ladda ner fulltext (pdf) av 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.

Ingår i Astronomy and Astrophysics, 2026

• DOI för VLT/CRIRES plus observations of warm Neptune WASP-107 b: Challenges in detecting molecules with ground-based transmission spectroscopy of cooler and cloudy exoplanets
• Ladda ner fulltext (pdf) av 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.

Ingår i Astronomy and Astrophysics, 2026

• DOI för PySME v1.0: Improved modelling of stellar spectra for survey-scale applications
• Ladda ner fulltext (pdf) av 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.

Ingår i Astronomy and Astrophysics, 2026

• DOI för Mass determination of the ultra-short-period planet LHS 3844 b First K-band radial velocity measurements with CRIRES+
• Ladda ner fulltext (pdf) av 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.

Ingår i Astronomy and Astrophysics, 2026

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

Ingår i Astronomy and Astrophysics, 2026

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

Ingår i Astronomy and Astrophysics, 2026

• DOI för Small-scale magnetic field effects on individual spectral line radial velocities in the photosphere and chromosphere of the Sun
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Abundance analysis of benchmark M dwarfs

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

Ingår i Astronomy and Astrophysics, 2025

• DOI för Abundance analysis of benchmark M dwarfs
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Retrieving wind properties from the ultra-hot dayside of WASP-189 b with CRIRES⁺

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

Ingår i Astronomy and Astrophysics, 2025

• DOI för Retrieving wind properties from the ultra-hot dayside of WASP-189 b with CRIRES⁺
• Ladda ner fulltext (pdf) av 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.

Ingår i Astronomy and Astrophysics, 2025

• DOI för 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
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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.

Ingår i Astronomy and Astrophysics, 2025

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

Ingår i Astronomy and Astrophysics, 2025

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

Ingår i Astronomy and Astrophysics, 2025

• DOI för CRIRES⁺ transmission spectroscopy of WASP-127 b: Detection of the resolved signatures of a supersonic equatorial jet and cool poles in a hot planet
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Optimising spectroscopic observations of transiting exoplanets

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

Ingår i Astronomy and Astrophysics, 2024

• DOI för Optimising spectroscopic observations of transiting exoplanets
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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.

Ingår i Astronomy and Astrophysics, 2024

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

Ingår i Astronomy and Astrophysics, 2024

• DOI för A conclusive non-detection of magnetic field in the Am star o Peg with high-precision near-infrared spectroscopy
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Secular stability of surface abundance structures in the rapidly rotating Ap star 56 Ari

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

Ingår i Astronomy and Astrophysics, 2024

• DOI för Secular stability of surface abundance structures in the rapidly rotating Ap star 56 Ari
• Ladda ner fulltext (pdf) av 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.

Ingår i Monthly notices of the Royal Astronomical Society, s. 2741-2762, 2024

• DOI för The mean longitudinal magnetic field and its uses in radial-velocity surveys
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Exploring the ultra-hot Jupiter WASP-178b

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

Ingår i Astronomy and Astrophysics, 2024

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

Continuous ultraviolet to blue-green astrocomb

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

Ingår i Nature Communications, 2024

• DOI för Continuous ultraviolet to blue-green astrocomb
• Ladda ner fulltext (pdf) av 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.

Ingår i Astronomy and Astrophysics, 2023

• DOI för Retrieval of the dayside atmosphere of WASP-43b with CRIRES⁺
• Ladda ner fulltext (pdf) av 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.

Ingår i Astronomy and Astrophysics, 2023

• DOI för Determination of small-scale magnetic fields on Sun-like stars in the near-infrared using CRIRES+
• Ladda ner fulltext (pdf) av 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.

Ingår i Monthly notices of the Royal Astronomical Society, s. 10376-10387, 2023

• DOI för Doppler imaging of a southern ApSi star HD 152564
• Ladda ner fulltext (pdf) av 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.

Ingår i Astronomy and Astrophysics, 2023

• DOI för CRIRES+ detection of CO emissions lines and temperature inversions on the dayside of WASP-18b and WASP-76b
• Ladda ner fulltext (pdf) av 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.

Ingår i Astronomy and Astrophysics, 2023

• DOI för CRIRES+ on sky at the ESO Very Large Telescope: Observing the Universe at infrared wavelengths and high spectral resolution
• Ladda ner fulltext (pdf) av 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

Ingår i Astronomy and Astrophysics, 2023

• DOI för PySME: Spectroscopy Made Easier
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Using Molecular Lines to Determine Carbon and Nitrogen Abundances in the Atmospheres of Cool Stars

Ryabchikova, Tatiana; Piskunov, Nikolai; Pakhomov, Yury

Ingår i Atoms, 2022

• DOI för Using Molecular Lines to Determine Carbon and Nitrogen Abundances in the Atmospheres of Cool Stars
• Ladda ner fulltext (pdf) av 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.

Ingår i Solar Physics, 2021

• DOI för Accurate Short-Characteristics Radiative Transfer in A Numerical Tool for Astrophysical RESearch (ANTARES)
• Ladda ner fulltext (pdf) av 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

Ingår i Astronomy and Astrophysics, 2021

• DOI för Optimal extraction of echelle spectra: Getting the most out of observations
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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.

Ingår i Monthly notices of the Royal Astronomical Society, s. 3304-3320, 2021

• DOI för 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.

Ingår i Atoms, 2020

• DOI för A Decade with VAMDC: Results and Ambitions
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Starspot activity of HD199178 Doppler images from 1994-2017

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

Ingår i Astronomy and Astrophysics, 2019

• DOI för 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

Ingår i Astronomy and Astrophysics, 2019

• DOI för 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

Ingår i Astronomy reports (Print), s. 1010-1021, 2019

• DOI för 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.

Ingår i Solar Physics, 2019

• DOI för 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.

Ingår i Astronomy and Astrophysics, 2019

• DOI för Spot evolution on LQ Hya from 2006-2017: temperature maps based on SOFIN and FIES data
• Ladda ner fulltext (pdf) av 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.

Ingår i Astronomy and Astrophysics, 2019

• DOI för 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

Ingår i Galaxies, 2018

• DOI för VALD: The Meeting Point of Data Producers and Data Users
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Model-independent Exoplanet Transit Spectroscopy

Aronson, Erik; Piskunov, Nikolai

Ingår i Astronomical Journal, 2018

• DOI för Model-independent Exoplanet Transit Spectroscopy

Inside a VAMDC data node-putting standards into practical software

Regandell, Samuel; Marquart, Thomas; Piskunov, Nikolai

Ingår i Physica Scripta, 2018

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

Spectroscopy Made Easy: Evolution

Piskunov, Nikolai; Valenti, Jeff A.

Ingår i Astronomy and Astrophysics, 2017

• DOI för 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.

Ingår i Journal of Physics B, 2016

• DOI för The virtual atomic and molecular data centre (VAMDC) consortium
• Ladda ner fulltext (pdf) av 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

Ingår i Astrophysical Journal Supplement Series, 2016

• DOI för 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.

Ingår i Monthly notices of the Royal Astronomical Society, s. 1221-1234, 2016

• DOI för 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.

Ingår i Astronomy reports (Print), s. 1-42, 2016

• DOI för 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.

Ingår i Experimental astronomy, s. 329-391, 2015

• DOI för The EChO science case
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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.

Ingår i Astronomy and Astrophysics, 2015

• DOI för 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.

Ingår i Physica Scripta, 2015

• DOI för 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.

Ingår i Astronomy and Astrophysics, 2015

• DOI för 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.

Ingår i Astronomical Journal, 2015

• DOI för 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.

Ingår i Monthly notices of the Royal Astronomical Society, s. 3038-3052, 2015

• DOI för 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.

Ingår i Astrophysical Journal, 2015

• DOI för 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

Ingår i Astronomy and Astrophysics, 2015

• DOI för 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

Ingår i Astronomy and Astrophysics, 2015

• DOI för Three-dimensional magnetic and abundance mapping of the cool Ap star HD 24712 II. Two-dimensional magnetic Doppler imaging in all four Stokes parameters
• Ladda ner fulltext (pdf) av 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.

Ingår i Astronomy and Astrophysics, 2014

• DOI för 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.

Ingår i Astronomy and Astrophysics, 2014

• DOI för 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.

Ingår i Astronomy and Astrophysics, 2013

• DOI för Are there tangled magnetic fields on HgMn stars?
• Ladda ner fulltext (pdf) av 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.

Ingår i Astronomy and Astrophysics, 2013

• DOI för Radial velocity signatures of Zeeman broadening

Delo-bezier formal solutions of the polarized radiative transfer equation

Rodriguez, Jaime de la Cruz; Piskunov, Nikolai

Ingår i Astrophysical Journal, s. 33, 2013

• DOI för 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.

Ingår i Astrophysical Journal, s. 11, 2013

• DOI för 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.

Ingår i Astronomy and Astrophysics, 2013

• DOI för Three-dimensional magnetic and abundance mapping of the cool Ap star HD 24712: I. Spectropolarimetric observations in all four Stokes parameters
• Ladda ner fulltext (pdf) av 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.

Ingår i Astronomy and Astrophysics, 2012

• DOI för 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.

Ingår i Astronomy and Astrophysics, 2012

• DOI för 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.

Ingår i Astronomy and Astrophysics, 2012

• DOI för 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.

Ingår i Astrophysical Journal, s. 21, 2012

• DOI för 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.

Ingår i Astronomy and Astrophysics, 2012

• DOI för 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.

Ingår i Astrophysical Journal, s. 10, 2011

• DOI för 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.

Ingår i Astronomy and Astrophysics, 2011

• DOI för 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.

Ingår i Astronomy and Astrophysics, 2011

• DOI för 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.

Ingår i Publications of the Astronomical Society of the Pacific, s. 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.

Ingår i Astrophysical Journal, s. 73, 2011

• DOI för 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.

Ingår i Astronomy and Astrophysics, 2011

• DOI för 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

Ingår i Astronomy and Astrophysics, 2011

• DOI för 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.

Ingår i Astronomy and Astrophysics, 2011

• DOI för 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.

Ingår i Astronomy and Astrophysics, s. 107, 2011

• DOI för 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.

Ingår i Astronomical Notes - Astronomische Nachrichten, s. 859-865, 2011

• DOI för Spot activity of II Peg

Rotation, magnetism and metallicity of M dwarf systems

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

Ingår i Monthly notices of the Royal Astronomical Society, s. 2548-2557, 2011

• DOI för 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.

Ingår i The Messenger, s. 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.

Ingår i Astrophysical Journal Letters, 2011

• DOI för 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.

Ingår i Journal of Quantitative Spectroscopy and Radiative Transfer, s. 2151-2159, 2010

• DOI för 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.

Ingår i Astronomy and Astrophysics, 2010

• DOI för 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.

Ingår i Astronomy and Astrophysics, 2010

• DOI för 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

Ingår i Astronomy and Astrophysics, 2010

• DOI för 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.

Ingår i Astronomy and Astrophysics, 2010

• DOI för 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.

Ingår i Monthly notices of the Royal Astronomical Society, s. 1299-1307, 2010

• DOI för 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.

Ingår i Planetary and Space Science, s. 1795-1806, 2009

• DOI för 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.

Ingår i Astrophysical Journal, s. 75-83, 2009

• DOI för 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.

Ingår i Journal of Physics, Conference Series, 2008

• DOI för 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.

Ingår i Journal of Physics, Conference Series, 2008

• DOI för 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

Ingår i Nature Physics, s. 526-529, 2007

• DOI för 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.

Ingår i Astrophysical Journal, s. 402-419, 2007

• DOI för 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.

Ingår i Nature, s. 657-659, 2006

• DOI för 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.

Ingår i Astronomy & Astrophysics, s. 1093, 2005

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

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

Ingår i Astronomy & Astrophysics, s. 933, 2004

Magnetic Doppler imaging of 53 Camelopardalis in all four Stokes parameters

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

Ingår i Astronomy & Astrophysics, s. 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.

Ingår i Astronomy & Astrophysics, s. 935, 2004

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

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

Ingår i Astronomy & Astrophysics, s. 13, 2004

Near-Polar Starspots and Polar Dynamo Waves

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

Ingår i Astronomy Reports, s. 522, 2004

He and Si surface inhomogeneities of four Bp variable stars

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

Ingår i Astronomy & Astrophysics, s. 273, 2004

The Photosphere and Veiling Spectrum of T Tauri Stars

Stempels, Eric H.C.; Piskunov, Nikolai

Ingår i Astronomy and Astrophysics, s. 693-706, 2003

• DOI för 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.

Ingår i SPIE: Polarimetery in Astronomy, s. 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.

Ingår i Astronomy & Astrophysics, s. 1033, 2003

Doppler Imaging of stellar magnetic fields. II. Numerical experiments

Kochukhov, Oleg; Piskunov, Nikolai

Ingår i Astronomy and Astrophysics, s. 868-888, 2002

Detailed analysis of Balmer lines in cool dwarf stars

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

Ingår i Astronomy & Astrophysics, s. 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.

Ingår i Astronomy and Astrophysics, s. 420-438, 2002

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

Stempels, H.C.; Piskunov, Nikolai

Ingår i Astronomy & Astrophysics, s. 595, 2002

Nonaxisymmetric cool spot distributions and dynamo action in close binaries

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

Ingår i Astronomy & Astrophysics, s. 885, 2002

Swing excitation and magnetic activity in close binary systems

Sokoloff, D.; Piskunov, Nikolai

Ingår i Monthly Notices of RAS, s. 925, 2002

Spectropolarimetry of starspots

Piskunov, Nikolai

Ingår i Astronomische Nachrichten, s. 257-259, 2002

New algorithms for reducing cross-dispersed echelle spectra

Piskunov, Nikolai; Valenti, J.

Ingår i Astronomy & Astrophysics, s. 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.

Ingår i Astronomy & Astrophysics, s. 545, 2002

Doppler Imaging of stellar magnetic fields. I. Techniques

Piskunov, Nikolai; Kochukhov, Oleg

Ingår i Astronomy & Astrophysics, s. 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.

Ingår i Astronomy & Astrophysics, s. 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

Ingår i Astronomy & Astrophysics, s. 965-970, 2001

Model atmospheres with individualized abundances

Piskunov, Nikolai; Kupka, F

Ingår i Astrophysical Journal, s. 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.

Ingår i Astronomy & Astrophysics, s. 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

Ingår i Astrophysical Journal, s. 756, 2000

• DOI för 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

Ingår i ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES, s. 467-473, 2000

Self broadening of hydrogen lines: initial results

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

Ingår i ASTRONOMY AND ASTROPHYSICS, 2000

Self-broadening in Balmer line wing formation in stellar atmospheres

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

Ingår i ASTRONOMY AND ASTROPHYSICS, s. 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.

Ingår i Astronomy and Astrophysics Supplement Series, s. 119-133, 1999

• DOI för 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.

Ingår i Physica scripta. T, s. 162-173, 1999

• DOI för 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.

Ingår i Astronomy & Astrophysics, s. 924-932, 1999

Eu III identification and Eu abundance in CP stars

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

Ingår i Astronomy & Astrophysics, s. 229-236, 1999

Spectral synthesis of TiO lines

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

Ingår i Astrophysical Journal, s. 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.

Ingår i Astrophysical Journal, s. 315-328, 1997

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

Valenti, JA; Piskunov, Nikolai

Ingår i Astronomy & Astrophysics Supplement Series, s. 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.

Ingår i The Messenger, s. 6-10, 2006

Continuous Ultraviolet to Blue-Green Astrocomb

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

Ingår i Proceedings, 2024

• DOI för 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.

Ingår i Ground-Based and Airborne Instrumentation for Astronomy X, 2024

• DOI för 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.

Ingår i Ground-Based and Airborne Instrumentation for Astronomy X, 2024

• DOI för 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.

Ingår i Ground-Based and Airborne Instrumentation for Astronomy X, 2024

• DOI för 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.

Ingår i Ground-Based and Airborne Instrumentation for Astronomy X, 2024

• DOI för 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.

Ingår i Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation VI, 2024

• DOI för 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.

Ingår i Modeling, Systems Engineering, and Project Management for Astronomy XI, 2024

• DOI för 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.

Ingår i Ground-Based And Airborne Instrumentation For Astronomy IX, 2022

• DOI för 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.

Ingår i Ground-based and Airborne Instrumentation for Astronomy IX, 2022

• DOI för 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.

Ingår i Ground-based and Airborne Instrumentation for Astronomy VIII, 2020

• DOI för 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.

Ingår i GROUND-BASED AND AIRBORNE INSTRUMENTATION FOR ASTRONOMY VII, 2018

• DOI för 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.

Ingår i GROUND-BASED AND AIRBORNE INSTRUMENTATION FOR ASTRONOMY VII, 2018

• DOI för 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.

Ingår i Ground-Based And Airborne Instrumentation For Astronomy VII, 2018

• DOI för 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.

Ingår i Ground-Based And Airborne Instrumentation For Astronomy VII, 2018

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

Deriving stellar parameters with the SME software package

Piskunov, Nikolai

Ingår i Second brite-constellation science conference, s. 209-213, 2017

Main High-Resolution Near-IR Spectrometer for the VLT

Piskunov, Nikolai

Ingår i Stars, s. 514-517, 2017

VALD3: Current Developments

Pakhomov, Yu; Piskunov, Nikolai; Ryabchikova, T

Ingår i Stars, s. 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.

Ingår i Stars, s. 509-513, 2017

Characterizing the cross dispersion reflection gratings of CRIRES

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

Ingår i Advances In Optical And Mechanical Technologies For Telescopes And Instrumentation Ii, 2016

• DOI för 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.

Ingår i GROUND-BASED AND AIRBORNE INSTRUMENTATION FOR ASTRONOMY VI, 2016

• DOI för 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.

Ingår i GROUND-BASED AND AIRBORNE INSTRUMENTATION FOR ASTRONOMY VI, 2016

• DOI för 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.

Ingår i GROUND-BASED AND AIRBORNE INSTRUMENTATION FOR ASTRONOMY VI, 2016

• DOI för 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.

Ingår i GROUND-BASED AND AIRBORNE INSTRUMENTATION FOR ASTRONOMY VI, 2016

• DOI för HARS3 for a Roboticized Isaac Newton Telescope

On the Accuracy of Atmospheric Parameter Determination in BAFGK Stars

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

Ingår i PHYSICS AND EVOLUTION OF MAGNETIC AND RELATED STARS, s. 308-319, 2015

Magnetic fields of Ap stars from full Stokes spectropolarimetric observations

Rusomarov, Naum; Kochukhov, Oleg; Piskunov, Nikolai

Ingår i PUTTING A STARS INTO CONTEXT, s. 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.

Ingår i GROUND-BASED AND AIRBORNE INSTRUMENTATION FOR ASTRONOMY V, 2014

• DOI för 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.

Ingår i PUTTING A STARS INTO CONTEXT, s. 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.

Ingår i GROUND-BASED AND AIRBORNE INSTRUMENTATION FOR ASTRONOMY V, 2014

• DOI för 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.

Ingår i Ground-based and Airborne Instrumentation for Astronomy V, 2014

• DOI för 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.

Ingår i GROUND-BASED AND AIRBORNE INSTRUMENTATION FOR ASTRONOMY V, 2014

• DOI för 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.

Ingår i GROUND-BASED AND AIRBORNE INSTRUMENTATION FOR ASTRONOMY V, 2014

• DOI för 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.

Ingår i Proceedings of SPIE, 2012

• DOI för 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.

Ingår i Magnetic Stars, s. 280-290, 2011

The HARPS Polarimeter

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

Ingår i 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.

Ingår i 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.

Ingår i Active OB stars, s. 202-203, 2011

• DOI för 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.

Ingår i 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.

Ingår i IAU Symposium 273 (The Physics of Sun and Star Spots), s. 78-82, 2011

• DOI för 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.

Ingår i 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.

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

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

Optimal Extraction of Echelle Spectra

Piskunov, Nikolai

Ingår i Precision Spectroscopy in Astrophysics, s. 129-132, 2007

• DOI för Optimal Extraction of Echelle Spectra

3-D Hydrodynamic Simulation of Convection in A Stars

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

Ingår i IAUS 239, Convection in Astrophysics, s. 68-70, 2007

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

Pinning Down Gravitational Settling

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

Ingår i Chemical Abundances and Mixing in Stars in the Milky Way and its Satellites, s. 294, 2006

• DOI för Pinning Down Gravitational Settling

Magnetic Doppler Imaging of Active Stars

Kochukhov, Oleg; Piskunov, Nikolai

Ingår i 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.

Ingår i 13th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun, s. 635, 2005

Magnetic Fields and Stellar Surface Structures

Piskunov, Nikolai

Ingår i High Resolution Infrared Spectroscopy in Astronomy, s. 315, 2005

Magnetic Doppler Imaging: Mathematical Basis

Piskunov, Nikolai

Ingår i EAS Publication series, vol. 17, s. 245, 2005

Magnetic Doppler imaging of early-type stars

Piskunov, Nikolai; Kochukhov, Oleg

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

Magnetic Doppler Imaging of Chemically Peculiar Stars

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

Ingår i The 3rd Solar Polarization Workshop, ASP conf. Ser., vol. 307, s. 549, 2003

Balmer lines and effective temperatures in cool stars

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

Ingår i 12th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun, s. 1103, 2003

Magnetic Doppler imaging of solar-type stars

Piskunov, Nikolai; Kochukhov, Oleg

Ingår i The 3rd Solar Polarization Workshop, ASP conf. Ser., vol. 307, s. 539, 2003

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

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

Ingår i IAUS 210, Modelling of stellar atmospheres, 2003

Probing Magnetospheric Infall onto CTTS with Time-resolved Veiling Measurements

Stempels, H.C.; Piskunov, Nikolai

Ingår i 12th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun, s. 735, 2003

Hydrogen Balmer Lines as Probes of Stellar Atmospheres

Barklem, Paul; Piskunov, Nikolai

Ingår i IAUS 210, Modelling of stellar atmospheres, 2003

Parametric Resonance and Magnetic Activity in Close Binary Systems

Sokoloff, D.D.; Piskunov, Nikolai

Ingår i IAUS 210, Modelling of stellar atmospheres, 2003

Tools and Methods for Abundance Analysis

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

Ingår i IAUS 210, Modelling of stellar atmospheres, 2003

Spectroscopy of rapidly oscillating Ap stars

Piskunov, Nikolai; Kochukhov, Oleg

Ingår i Radial and Nonradial Pulsations as Probes of Stellar Physics, ASP Conf. Ser., vol. 259, s. 280, 2002

The Search and Modelling of Magnetic Fields on M Dwarfs

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

Ingår i Magnetic Fields Across the Hertzsprung-Russell Diagram, Conference Proceedings, s. 219, 2001

Time-Resolved Spectroscopy of the roAp Star gamma Equ

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

Ingår i Magnetic Fields Across the Hertzsprung-Russell Diagram, Conference Proceedings, s. 341, 2001

Hydrogen Line Formation in Cool Stars

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

Ingår i 11th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun, s. 766, 2001

Magnetic Doppler Imaging of alpha2 CVn

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

Ingår i Magnetic Fields Across the Hertzsprung-Russell Diagram, Conference Proceedings, s. 321, 2001

Recent Developments of the VALD Database

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

Ingår i 11th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun, s. 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.

Ingår i Magnetic Fields Across the Hertzsprung-Russell Diagram, ASP Conf. Ser., vol. 248, s. 527, 2001

Magnetic Doppler Imaging of Chemically Peculiar Stars

Piskunov, Nikolai; Kochukhov, Oleg

Ingår i Astrotomography, Indirect Imaging Methods in Observational Astronomy, Lecture Notes in Physics, s. 238, 2001

Chemical Stratification in Magnetic Ap Stars

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

Ingår i Magnetic Fields Across the Hertzsprung-Russell Diagram, ASP Conf. Ser., vol. 248, s. 373, 2001

Doppler Imaging of Eclipsing Binary Systems ER Vul and TY Pyx

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

Ingår i 11th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun, ASP Conf. Ser., vol. 223, s. 1285, 2001

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

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

Ingår i 11th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun, ASP Conf. Ser., vol. 223, s. 1579, 2001

Magnetic Doppler Imaging of CP Stars

Piskunov, Nikolai

Ingår i Magnetic Fields Across the Hertzsprung-Russell Diagram, ASP Conf. Ser., vol. 248, s. 293, 2001

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

Pettersson, Bertil; Stempels, Eric; Piskunov, Nikolai

Ingår i Fiber Optics in Astronomy III, s. 343, 1998

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

Modelling of Stellar Atmospheres

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

2003