A Homogeneous Study of Transiting Exoplanets and their Host Stars

Physics

Scientific paper

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Scientific paper

Transiting exoplanets are key to understanding planetary formation. However, the determination of their mass and size, and
hence of their composition depends crucially on our ability to correctly infer the properties of their parent stars. Our
goal is to investigate how uncertainties on stellar parameters and possible systematic effects in the modeling of stellar
evolution impinge on planet characterization. We create an extensive grid of stellar models based on mass, chemical
composition and input-physics and perform a sensitivity test on planetary properties. Using a homogeneous sample of
stars+transiting planets, we systematically model the evolution of the stars and of their planets to derive possible
compositions.
In some cases such as CoRoT-2, we identify a new ensemble of solutions corresponding to the pre-main sequence evolution of
the parent star that allow for a self-consistent solution accounting for the large planet size.
We also revisit the question of the star-planet metallicity correlation in light of stellar evolution models for various metallicities.

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