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Proceedings Paper

Study of exoplanets host stars with VEGA/CHARA
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Paper 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.

Paper Details

Date Published: 12 September 2012
PDF: 10 pages
Proc. SPIE 8445, Optical and Infrared Interferometry III, 84450J (12 September 2012); doi: 10.1117/12.925503
Show Author Affiliations
R. Ligi, Lab. Lagrange, Univ. Nice Sophia Antipolis, CNRS, Observatoire de la Côte d'Azur (France)
D. Mourard, Lab. Lagrange, Univ. Nice Sophia Antipolis, CNRS, Observatoire de la Côte d'Azur (France)
Anne-Marie Lagrange, Institut de Planétologie et d'Astrophysique de Grenoble (France)
Karine Perraut, UJF-Grenoble 1, CNRS-INSU, Institut de Planétologie et d'Astrophysique de Grenoble (France)
I. Tallon-Bosc, Univ. de Lyon (France)
CRAL, Observatoire de Lyon, CNRS, Univ. Lyon 1, Ecole Normale Supèrieure de Lyon (France)

Published in SPIE Proceedings Vol. 8445:
Optical and Infrared Interferometry III
Françoise Delplancke; Jayadev K. Rajagopal; Fabien Malbet, Editor(s)

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