NOAO >   Observing Info >   Approved Programs >   2017B-0112

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Program Information for 2017B-0112


PI: Roxanne Ligi, Laboratoire d'Astrophysique de Marseille, roxanne.ligi@lam.fr
Address: Site de Chateau Gombert, 38 rue F. Joliot-Curie, Marseille 13388 France

Title: Characterizing transiting exoplanet host stars with interferometry

Abstract: After the discovery of thousands of exoplanets, the new challenge of the 21$^{th}$ century has become their characterization. To derive the exoplanets bulk density and internal composition, we need to know their mass and radius. The latter can only be obtained if the stellar radius is known, since the transit method only provides the ratio of the planetary to the stellar radius. We want to continue our program of transiting exoplanet host stars observations (started in 2014) that aims at measuring their angular diameters. Combined with the distances, our interferometric measurements will provide model-independent stellar radii. New discoveries of transiting exoplanets in the past two years, and the opening of the CHARA array during the winter allow us to observe interesting targets that were out of reach before. We will use all available direct measurements by using priors along with the direct measurements to derive the stellar masses and ages in a bayesian approach. This will allow to derive a precise bulk density of the transiting exoplanets from the stellar parameters, and their internal structure.

Program Type: Standard/Galactic

Scheduled Nights:
Run 1 (2017B):  CHARA/VEGA -- 15hrs


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NOAO >   Observing Info >   Approved Programs >   2017B-0112

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