Study of exoplanets host stars with VEGA/CHARA

R. Ligi; D. Mourard; Anne-Marie Lagrange; Karine Perraut; I. Tallon-Bosc

doi:10.1117/12.925503

12 September 2012 Study of exoplanets host stars with VEGA/CHARA

R. Ligi, D. Mourard, Anne-Marie Lagrange, Karine Perraut, I. Tallon-Bosc

Proceedings Volume 8445, Optical and Infrared Interferometry III; 84450J (2012) https://doi.org/10.1117/12.925503
Event: SPIE Astronomical Telescopes + Instrumentation, 2012, Amsterdam, Netherlands

Abstract

In the framework of the understanding of extrasolar systems, the study of host stars is a fundamental point. We need to understand the link between them and the presence of companions, i.e. what makes a star becoming a host star. In this perspective, we used the instrument called VEGA, situated at Mount Wilson (California) on the CHARA array to perform optical interferometric measurements. Interferometry at visible wavelengths allows reaching very high spatial frequencies well adapted for very small (less than 1 millisecond of arc) angular diameters. Therefore, we can access limb darkening measurements which is one of the very few directly measurable constraints on the structure of the atmosphere of a star. From this we can derive stars fundamental parameters. A precise measurement within spectral lines is also a very powerful tool to study the temperature and density structure of the atmosphere of distant stars. Besides, the detection of exoplanets is also related to this method. Combined with the radial velocity method and the transit method, one can study the atmosphere of exoplanets and learn more about their internal structure. We started a large program of observations made of 40 stars hosting exoplanets and observable by VEGA/CHARA. We will measure their limb darkened diameters and derive their parameters. We also aim at better understanding stellar noise sources like spots, and study surface brightness relationships.

Citation Download Citation

R. Ligi, D. Mourard, Anne-Marie Lagrange, Karine Perraut, and I. Tallon-Bosc "Study of exoplanets host stars with VEGA/CHARA", Proc. SPIE 8445, Optical and Infrared Interferometry III, 84450J (12 September 2012); https://doi.org/10.1117/12.925503

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KEYWORDS

Stars

Exoplanets

Planets

Visibility

Interferometry

Temperature metrology

Electroluminescent displays

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