Nikolai Piskunov
Professor at Institutionen för fysik och astronomi; Astronomi och rymdfysik
- Telephone:
- +46 18 471 59 58
- E-mail:
- nikolai.piskunov@physics.uu.se
- Visiting address:
- Ångströmlaboratoriet, Lägerhyddsvägen 1
- Postal address:
- Box 516
751 20 UPPSALA
More information is available to staff who log in.
Publications
Recent publications
- Optimising spectroscopic observations of transiting exoplanets (2024)
- Continuous ultraviolet to blue-green astrocomb (2024)
- CRIRES+ on sky at the ESO Very Large Telescope (2023)
- Determination of small-scale magnetic fields on Sun-like stars in the near-infrared using CRIRES+ (2023)
- Retrieval of the dayside atmosphere of WASP-43b with CRIRES+ (2023)
All publications
Articles
- Optimising spectroscopic observations of transiting exoplanets (2024)
- Continuous ultraviolet to blue-green astrocomb (2024)
- CRIRES+ on sky at the ESO Very Large Telescope (2023)
- Determination of small-scale magnetic fields on Sun-like stars in the near-infrared using CRIRES+ (2023)
- Retrieval of the dayside atmosphere of WASP-43b with CRIRES+ (2023)
- Doppler imaging of a southern ApSi star HD 152564 (2023)
- PySME (2023)
- CRIRES+ detection of CO emissions lines and temperature inversions on the dayside of WASP-18b and WASP-76b (2023)
- Using Molecular Lines to Determine Carbon and Nitrogen Abundances in the Atmospheres of Cool Stars (2022)
- CRIRES+ detection of H2O and CO in the transmission spectra of WASP-107 b (2022)
- Accurate Short-Characteristics Radiative Transfer in A Numerical Tool for Astrophysical RESearch (ANTARES) (2021)
- Evolution of brightness and magnetic features of young solar-type stars - I. The young G star HIP 89829 (2021)
- Optimal extraction of echelle spectra (2021)
- A Decade with VAMDC (2020)
- Model-free inverse method for transit imaging of stellar surfaces (2019)
- Spot evolution on LQ Hya from 2006-2017 (2019)
- Starspot activity of HD199178 Doppler images from 1994-2017 (2019)
- Hyperfine Splitting in the VALD Database of Spectral-line Parameters (2019)
- Evaluation of the Recent Atomic Data for Fe i Lines Based on Solar and Stellar Spectra (2019)
- Long-term spot monitoring of the young solar analogue V889 Herculis (2019)
- Model-independent Exoplanet Transit Spectroscopy (2018)
- Inside a VAMDC data node-putting standards into practical software (2018)
- VALD (2018)
- Spectroscopy Made Easy (2017)
- Scientific problems addressed by the Spektr-UV space project (world space Observatory-Ultraviolet) (2016)
- Spectral Properties Of Cool Stars (2016)
- The virtual atomic and molecular data centre (VAMDC) consortium (2016)
- Accuracy of atmospheric parameters of FGK dwarfs determined by spectrum fitting (2016)
- Using near-infrared spectroscopy for characterization of transiting exoplanets (2015)
- Accurate Gravities of F, G, and K Stars from High Resolution Spectra Without External Constraints (2015)
- Serendipitous Discovery of a Dwarf Nova in the Kepler Field Near the G Dwarf Kic 5438845 (2015)
- Doppler imaging of LQ Hydrae for 1998-2002 (2015)
- Magnetic field topology and chemical spot distributions in the extreme Ap star HD 75049 (2015)
- Stellar activity as noise in exoplanet detection - I. Methods and application to solar-like stars and activity cycles (2015)
- Three-dimensional magnetic and abundance mapping of the cool Ap star HD 24712 II. Two-dimensional magnetic Doppler imaging in all four Stokes parameters (2015)
- A major upgrade of the VALD database (2015)
- The EChO science case (2015)
- Doppler images of DI Piscium during 2004-2006 (2014)
- Exploring the magnetic field complexity in M dwarfs at the boundary to full convection (2014)
- Magnetically Controlled Accretion on the Classical T Tauri Stars GQ Lupi and TW Hydrae (2013)
- Are there tangled magnetic fields on HgMn stars? (2013)
- Radial velocity signatures of Zeeman broadening (2013)
- Delo-bezier formal solutions of the polarized radiative transfer equation (2013)
- Three-dimensional magnetic and abundance mapping of the cool Ap star HD 24712 (2013)
- M2K. II. A Triple-Planet System Orbiting Hip 57274 (2012)
- Doppler images of II Pegasi for 2004-2010 (2012)
- Magnetism, chemical spots, and stratification in the HgMn star ϕ Phoenicis (2012)
- Multi-element Doppler imaging of the CP2 star HD 3980 (2012)
- M-dwarf metallicities (2012)
- Spot activity of II Peg (2011)
- THE NASA-UC ETA-EARTH PROGRAM. III. A SUPER-EARTH ORBITING HD 97658 AND A NEPTUNE-MASS PLANET ORBITING G1 785 (2011)
- The NASA-UC Eia-earth program. II. a planet orbiting HD 156668 with a minimum mass of four earth masses (2011)
- No magnetic field in the spotted HgMn star mu Leporis (2011)
- First detection of linear polarization in the line profiles of active cool stars (2011)
- Analyzing low signal-to-noise FUSE spectra Confirmation of Lyman continuum escape from Haro 11 (2011)
- Analyzing low signal-to-noise FUSE spectra (2011)
- Doppler images of the RS CVn binary II Pegasi during the years 1994-2002 (2011)
- Chemical spots in the absence of magnetic field in the binary HgMn star 66 Eridani (2011)
- The search for magnetic fields in mercury-manganese stars (2011)
- HARPSpol - The New Polarimetric Mode for HARPS (2011)
- Rotation, magnetism and metallicity of M dwarf systems (2011)
- The Exoplanet Orbit Database (2011)
- Time-resolved photometric and spectroscopic analysis of the luminous Ap star HD 103498 (2010)
- Least-squares deconvolution of the stellar intensity and polarization spectra (2010)
- Surface structure of the CoRoT CP2 target star HD50773 (2010)
- Magnetic Doppler imaging of the roAp star HD 24712 (2010)
- Modelling the molecular Zeeman-effect in M-dwarfs (2010)
- THE NASA-UC ETA-EARTH PROGRAM (2009)
- Detection of dusty plasma near the E-ring of Saturn (2009)
- VALD — an atomic and molecular database for astrophysics (2008)
- A comparative analysis of the laboratory and theoretical transition probabilities of the Fe-peak elements for a new release of VALD (2008)
- Weather in stellar atmosphere revealed by the dynamics of mercury clouds in alpha Andromedae (2007)
- Atomic Diffusion and Mixing in Old Stars (2007)
- A probable stellar solution to the cosmological lithium discrepancy (2006)
- New Abundances for Old Stars – Atomic Diffusion at Work in NGC 6397 (2006)
- Inhomogeneous distribution of mercury on the surfaces of rapidly rotating HgMn stars (2005)
- He and Si surface inhomogeneities of four Bp variable stars (2004)
- Magnetic Doppler imaging of 53 Camelopardalis in all four Stokes parameters (2004)
- Multi-element abundance Doppler imaging of the rapidly oscillating Ap star HR 3831 (2004)
- No magnetic field variation with pulsation phase in the roAp star gamma Equulei (2004)
- Near-Polar Starspots and Polar Dynamo Waves (2004)
- The influence of magnetic fields on the hydrostatic structure of the atmospheres of chemically peculiar stars (2004)
- Doppler Imaging of the Ap star epsilon Ursae Majoris: Ca, Cr, Fe, Mg, Mn, Ti, Sr (2003)
- The Photosphere and Veiling Spectrum of T Tauri Stars (2003)
- PEPSI spectro-polarimeter for the LBT (2003)
- Detailed analysis of Balmer lines in cool dwarf stars (2002)
- Doppler Imaging of stellar magnetic fields. II. Numerical experiments (2002)
- Doppler Imaging of stellar magnetic fields. III. Abundance distribution and magnetic field geometry of alpha 2 CVn (2002)
- Nonaxisymmetric cool spot distributions and dynamo action in close binaries (2002)
- Spectropolarimetry of starspots (2002)
- Doppler Imaging of stellar magnetic fields. I. Techniques (2002)
- New algorithms for reducing cross-dispersed echelle spectra (2002)
- Abundance stratification and pulsation in the atmosphere of the roAp star gamma Equulei (2002)
- Swing excitation and magnetic activity in close binary systems (2002)
- Spectroscopy of T Tauri stars with UVES. Observations and analysis of RU Lup (2002)
- The core-wing anomaly of cool Ap stars - Abnormal Balmer profiles (2001)
- Formation of Fe x-Fe XIV coronal lines in the accretion shock of T Tauri stars (2001)
- Model atmospheres with individualized abundances (2001)
- LTE spectrum synthesis in magnetic stellar atmospheres - The interagreement of three independent polarised radiative transfer codes (2001)
- A list of data for the broadening of metallic lines by neutral hydrogen collisions (2000)
- Self-broadening in Balmer line wing formation in stellar atmospheres (2000)
- Self broadening of hydrogen lines: initial results (2000)
- The Three-dimensional Structure of the Warm Local Interstellar Medium. I. Methodology (2000)
- VALD-2 (1999)
- Multi element Doppler imaging of Ap stars I. He, Mg, Si, Cr and Fe surface distribution for CU Virginis (1999)
- The Vienna Atomic Line Data Base - a status report (1999)
- Eu III identification and Eu abundance in CP stars (1999)
- Spectral synthesis of TiO lines (1998)
- Local interstellar medium properties and deuterium abundances for the lines of sight toward HR 1099, 31 Comae, beta Ceti, and beta Cassiopeiae (1997)
- Spectroscopy made easy: A new tool for fitting observations with synthetic spectra (1996)
Books
Conferences
- CRIRES+ (2022)
- CRIRES+ on sky (2022)
- ELT-HIRES, the high resolution spectrograph for the ELT (2020)
- Full System Test and early Preliminary Acceptance Europe results for CRIRES (2018)
- Analysis of the polarimetric performance of the HARPS3 Cassegrain adaptor unit (2018)
- ELT-HIRES, the high resolution spectrograph for the ELT (2018)
- A unique infrared spectropolarimetric unit for CRIRES+ (2018)
- VALD3 (2017)
- Main High-Resolution Near-IR Spectrometer for the VLT (2017)
- Deriving stellar parameters with the SME software package (2017)
- Program Package for the Analysis of High Resolution High Signal-To-Noise Stellar Spectra (2017)
- 4MOST (2016)
- The " plus " for CRIRES (2016)
- Characterizing the cross dispersion reflection gratings of CRIRES (2016)
- EELT-HIRES the high-resolution spectrograph for the E-ELT (2016)
- HARS3 for a Roboticized Isaac Newton Telescope (2016)
- On the Accuracy of Atmospheric Parameter Determination in BAFGK Stars (2015)
- CRIRES plus (2014)
- Novel infrared polarimeter for the ESO CRIRES plus instrument (2014)
- Concept and optical design of the cross-disperser module for CRIRES+ (2014)
- Methodology for measuring fundamental parameters and associated uncertainties for middle and cool main-sequence stars (2014)
- Magnetic fields of Ap stars from full Stokes spectropolarimetric observations (2014)
- Wavelength calibration from 1-5 mu m for the CRIRES plus high-resolution spectrograph at the VLT (2014)
- HIRES (2014)
- Upgrading CRIRES-VLT to cross-dispersed mode (2012)
- Starspot variability and evolution from modeling Kepler photometry of active late-type stars (2011)
- Kepler Observations of Starspot Evolution, Differential Rotation, and Flares on Late-Type Stars (2011)
- The search for magnetic fields in mercury-manganese stars (2011)
- Magnetic Fields of M-Dwarfs from the Molecular and Atomic Diagnostics (2011)
- The HARPS Polarimeter (2011)
- VAMDC (2011)
- VAMDC (2010)
- Magnetic fields in M dwarf stars from high-resolution infrared spectra (2009)
- 3-D Hydrodynamic Simulation of Convection in A Stars (2007)
- Optimal Extraction of Echelle Spectra (2007)
- Magnetic Doppler Imaging of Active Stars (2006)
- Pinning Down Gravitational Settling (2006)
- Cool stars in the Gaia photometric system (2005)
- Magnetic Fields and Stellar Surface Structures (2005)
- Magnetic Doppler Imaging: Mathematical Basis (2005)
- Hydrogen Balmer Lines as Probes of Stellar Atmospheres (2003)
- Balmer lines and effective temperatures in cool stars (2003)
- Tools and Methods for Abundance Analysis (2003)
- Magnetic Doppler Imaging of Chemically Peculiar Stars (2003)
- Magnetic Doppler imaging of early-type stars (2003)
- Magnetic Doppler imaging of solar-type stars (2003)
- Parametric Resonance and Magnetic Activity in Close Binary Systems (2003)
- Probing Magnetospheric Infall onto CTTS with Time-resolved Veiling Measurements (2003)
- The influence of global magnetic field evolution on the structure of atmospheres of early-type stars (2003)
- Spectroscopy of rapidly oscillating Ap stars (2002)
- Hydrogen Line Formation in Cool Stars (2001)
- New Measurements of T Tauri Magnetic Fields: Testing Magnetospheric Accretion (2001)
- Magnetic Doppler Imaging of alpha2 CVn (2001)
- The Search and Modelling of Magnetic Fields on M Dwarfs (2001)
- Time-Resolved Spectroscopy of the roAp Star gamma Equ (2001)
- Magnetic Doppler Imaging of CP Stars (2001)
- Magnetic Doppler Imaging of Chemically Peculiar Stars (2001)
- Doppler Imaging of Eclipsing Binary Systems ER Vul and TY Pyx (2001)
- Recent Developments of the VALD Database (2001)
- Using FeH to Measure Magnetic Fields on Cool Stars and Brown Dwarfs (2001)
- Chemical Stratification in Magnetic Ap Stars (2001)
- A Fiber-Linked Four Stokes-Parameter Polarimeter for the SOFIN Spectrometer on the Nordic Optical Telescope (1998)
