Kostogryz, Nadiia

Scientist

Solar and Stellar Interiors
+49 551 384 979-275

BT2.E2.302

Main Focus

Stellar magnetic activity and surface inhomogeneities: studying their effects on stellar spectra, limb darkening, and photometric variability.

Stellar flicker and granulation: studying short-timescale brightness variations from both a 3D simulation and observational perspective to probe surface convection and stellar atmospheric properties, including analyses based on PLATO and JWST observations.

3D stellar atmosphere modelling: combining radiative magnetohydrodynamic simulations, spectral synthesis, high-resolution spectra, and high-precision photometric and spectroscopic observations.

Helio- and asteroseismology: studying how stellar granulation, realistic stellar atmospheres, and radiative transfer influence seismic observables.

Exoplanet characterization: investigating how stellar activity and surface structures affect transit observations, particularly for missions such as PLATO and JWST.

Curriculum Vitae

Education and Employment

04/2025 - Scientist (permanent), Solar and Stellar Spectra Group, Max-Planck-Institut für Sonnensystemforschung, Göttingen, Germany

01/2018 – 03/2025 Scientist, Max-Planck-Institut für Sonnensystemforschung, Göttingen, Germany

03/2013 – 12/2017 Postdoctoral Researcher, Kiepenheuer-Institut für Sonnenphysik, Freiburg, Germany

01/2013 – 02/2013 Senior Research Scientist, Main Astronomical Observatory of National Academy of Science (NAS) of Ukraine, Kyiv, Ukraine

05/2011 – 12/2012 Research Scientist, Main Astronomical Observatory of NAS of Ukraine, Kyiv, Ukraine

08/2011 – 10/2011 Visiting Scientist, Max Planck Institute for Astronomy, Heidelberg, Germany supported by DAAD (German Academic Exchange Service) Fellowship

11/2007 – 04/2011 Junior Research Scientist, Main Astronomical Observatory of NAS of Ukraine, Kyiv, Ukraine

11/2004 – 10/2007 PhD student, Main Astronomical Observatory of NAS of Ukraine, Kyiv, Ukraine

09/2003 – 06/2004 Master in Astronomy and Physics with honors Kyiv National Taras Shevchenko University, Kyiv, Ukraine

09/1999 – 06/2003 Bachelor in physics with honors Kyiv National Taras Shevchenko University, Kyiv, Ukraine

Publicly Available Research Products

Kostogryz, Nadiia, 2022, "An extended MPS-ATLAS library of stellar model atmospheres and spectra"

Kostogryz, Nadiia, 2026, "Magnetic Limb-Darkening Spectral Library for Main-Sequence Stars”

Professional Service

2026 - PLATO Working Group: “Characterizing stellar surface magnetism from transit light curves” (Leader)

2026 - Topical Team: “3D MHD Stellar Models” in Plato Working Group ”Stellar Variability Mitigation” (Co-lead with Heather Cegla and Lionel Bigot)

2026 International Space Science Institute (ISSI) Team ID #26-689: “Beyond Symmetric Transits: Stellar Magnetism and Planetary Climate” (PI: Alexander Shapiro and Nadiia Kostogryz)

2019 - PLATO Data Center Work Package 33: Contribution: Development of data reduction pipelines of Level-1 data product and Calibration Parameter Derivation System (CPDS)

2020 - PLATO Science Work Package 122: “Non-seismic parameters and model atmospheres; Contribution: Simulation of 1D and 3D model atmospheres and spectra

2022 External expert of the International Space Science Institute (ISSI) Team 446: “Linking Solar and Stellar Variabilities; Contribution: Modelling of stellar limb darkening and contamination of transmission spectra

2020 NASA Study Analysis Group 21: “The Effect of Stellar Contamination on Space-based Transmission Spectroscopy”; Contribution: Major contributor to WP1 'Stellar photospheric and chromospheric heterogeneity’

Grants

2026 Grant from the NASA JWST program. Cycle 5 ”Granulation in colors” (co-PI)

2024 Grant from the "Pioneering Research – Exploring the Unknown

Unknown” program of the Volkswagen Foundation (German Partner) (three years)

2023 Grant from the NASA JWST program. Cycle 2 (co-PI)

Selected Publications

1. N. M. Kostogryz, A. I. Shapiro, V. Witzke, et al, Effect of surface magnetic fields on limb darkening in main-sequence stars, Astronomy and Astrophysics in print (2026)

2. N. M. Kostogryz, A. I. Shapiro, L. Carone et al , The Effect of Stellar Magnetic Activity on Measurements of Morning and Evening Asymmetry of Planetary Terminator, Astrophysical Journal Letters 989, 6 (2025)

3. N. M. Kostogryz, A. I. Shapiro, V. Witzke, et al, Magnetic origin of the discrepancy between stellar limb-darkening models and observations, Nature Astronomy 8, 929 (2024)

4. N. Kostogryz, V. Witzke, A. I. Shapiro, S. K. Solanki, P. F. L. Maxted, R. L. Kurucz, L. Gizon, Stellar limb darkening. A new MPS-ATLAS library for Kepler, TESS, CHEOPS, and PLATO passbands. Astronomy and Astrophysics 666, A60 (2022)

5. N. M. Kostogryz, D. Fournier, L. Gizon, Modelling continuum intensity perturbations caused by solar acoustic oscillations. Astronomy and Astrophysics 654, A1 (2021)