Göttingen 2025 – scientific programme
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EP: Fachverband Extraterrestrische Physik
EP 9: Exoplanets and Astrobiology
EP 9.2: Talk
Wednesday, April 2, 2025, 16:45–17:00, ZHG005
How to improve the initial stellar characterisation of faint stars with transiting planets? — •Matthias Ammler-von Eiff1, Daniel Sebastian2, Jie Yu3, Chen Jiang1, and Eike W. Guenther4 — 1MPI for Solar System Research, Germany — 2School of Physics and Astronomy, University of Birmingham — 3School of Computing, Australian National University — 4Thuringian State Observatory, Germany
The study of planetary systems in different Galactic environments is particularly interesting. These systems can be distant so that the host stars can be too faint for a precise characterisation with asteroseismology, interferometry, or ground-based spectroscopy. Also, extinction plays an important role.
An accurate determination of the host star parameters is essential to characterise planets in their orbit. In order to better understand the limitations for faint host stars and to identify possible solutions in preparation of PLATO, we reviewed the stellar parameters of all 36 CoRoT targets with planets detected.
We identified independent constraints, for instance from stellar density based on transit light curves and from distance from Gaia. We compared those to published estimates of extinction and effective temperature. This way, we can find out how accurate stellar parameters are and derive extinction more accurate than before. Eventually, we can derive the radii of the host stars in a homogeneous way. To our knowledge, this is the first time that the full set of CoRoT host stars is characterised with precise distances from Gaia.
Keywords: exoplanets; CoRoT; stellar parameters; Gaia; transit method