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Dr. Matthias Steffen

Image of Matthias Steffen

Research Topics

  • Hydrodynamics
  • Radiative Transfer
  • Numerical Simulations
  • Spectroscopy, chemical Abundances
  • Stellar Atmospheres, Stellar Convection
  • Solar and stellar activity
  • Stellar Structure and Evolution
  • Stellar Pulsations, Helio- and Asteroseismology
  • Solar-terrestrial relations

  • Stellar Winds
  • Planetary Nebulae
Stellar Physics and Exoplanets
Senior Scientist
Office: KH/2.30
Phone: +49 331 7499 371
msteffennothing@aip.de

Leibniz-Institut
für Astrophysik Potsdam (AIP)
An der Sternwarte 16
14482 Potsdam

Publications

Latest refereed publications, retrieved from NASA ADS:

Unveiling the nature of HE 0107─5240: a long period binary CEMP-no star with [Fe/H] of ─5.56
Caffau, E., Steffen, M., ..., 2025
Astronomy and Astrophysics, 704, A238; published December 2025
doi:10.1051/0004-6361/202556891, NASA ADS
Participating AIP research groups: Stellar Physics and Exoplanets
Surface activity of a Rossby sequence of cool Hyades stars
Strassmeier, K. G., Ilyin, I., Steffen, M., Barnes, S. A., 2025
Astronomy and Astrophysics, 704, A8; published November 2025
doi:10.1051/0004-6361/202556888, NASA ADS
Participating AIP research groups: Stellar Physics and Exoplanets, High-resolution Spectroscopy and Polarimetry (now: Astronomical Spectroscopic Instrumentation), Stellar Activity
SDSS J102915.14+172927.9: Revisiting the chemical pattern
Caffau, E., ... Steffen, M., ... Gallagher, A. J., ..., 2024
Astronomy and Astrophysics, 691, A245; published November 2024
doi:10.1051/0004-6361/202452079, NASA ADS
Participating AIP research groups: Stellar Physics and Exoplanets
The PEPSI Exoplanet Transit Survey (PETS) - V. New Na D transmission spectra indicate a quieter atmosphere on HD 189733b
Keles, E., ... Poppenhaeger, K., ... Carroll, T. A., Ilyin, I., Baratella, M., Steffen, M., Strassmeier, K. G., ... Mallonn, M., ..., 2024
Monthly Notices of the Royal Astronomical Society, 530, 4, 4826; published June 2024
doi:10.1093/mnras/stae1097, NASA ADS
Participating AIP research groups: Stellar, Solar and Exoplanetary Physics, Stellar Physics and Exoplanets, High-resolution Spectroscopy and Polarimetry (now: Astronomical Spectroscopic Instrumentation)
MINCE. II. Neutron capture elements
François, P., ... Steffen, M., ... Gallagher, A. J., ... Valentini, M., 2024
Astronomy and Astrophysics, 686, A295; published June 2024
doi:10.1051/0004-6361/202449539, NASA ADS
Hot bubbles of planetary nebulae with hydrogen-deficient winds. III. Formation and evolution in comparison with hydrogen-rich bubbles
Schönberner, D., Steffen, M., 2024
Astronomy and Astrophysics, 684, A105; published April 2024
doi:10.1051/0004-6361/202346170, NASA ADS
Participating AIP research groups: Stellar Physics and Exoplanets, Stellar Activity
Effects of magnetic fields on the center-to-limb variation in solar-type stars
Ludwig, H.-G., Steffen, M., Freytag, B., 2023
Astronomy and Astrophysics, 679, A65; published November 2023
doi:10.1051/0004-6361/202346783, NASA ADS
Participating AIP research groups: Stellar Physics and Exoplanets
VPNEP: Detailed characterization of TESS targets around the Northern Ecliptic Pole. I. Survey design, pilot analysis, and initial data release
Strassmeier, K. G., Weber, M., Gruner, D., Ilyin, I., Steffen, M., Baratella, M., Järvinen, S., Granzer, T., Barnes, S. A., Carroll, T. A., Mallonn, M., Sablowski, D., ..., 2023
Astronomy and Astrophysics, 671, A7; published March 2023
doi:10.1051/0004-6361/202245255, NASA ADS
Participating AIP research groups: Stellar, Solar and Exoplanetary Physics, Stellar Physics and Exoplanets, Telescope Control and Robotics (now: Research Data Infrastructure), High-resolution Spectroscopy and Polarimetry (now: Astronomical Spectroscopic Instrumentation), Optics, Stellar Activity
The solar photospheric silicon abundance according to CO5BOLD. Investigating line broadening, magnetic fields, and model effects
Deshmukh, S. A., ... Steffen, M., ..., 2022
Astronomy and Astrophysics, 668, A48; published December 2022
doi:10.1051/0004-6361/202142072, NASA ADS
Participating AIP research groups: Stellar Physics and Exoplanets
On the lithium abundance of the visual binary components ξ Boo A ( G8V ) and ξ Boo B ( K5V )
Strassmeier, K. G., Steffen, M., 2022
Astronomische Nachrichten, 343, 9-10, e20220036; published November 2022
doi:10.1002/asna.20220036, NASA ADS
Participating AIP research groups: Stellar Physics and Exoplanets