Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006dps....38.0108f&link_type=abstract
American Astronomical Society, DPS meeting #38, #01.08; Bulletin of the American Astronomical Society, Vol. 38, p.482
Astronomy and Astrophysics
Astronomy
Scientific paper
Ten exoplanets are now known to transit their star. The knowledge of their mass and radius allows an estimate of their composition. These planets show an anticorrelation between their radius and the metallicity of their host star. We here consider this change of radius to be linked to the presence of heavy elements in the core of close-in exoplanets (Guillot et al. 2006.) As high metallicity stars are much more likely to have giant exoplanets, this directly impacts photometric survey results. We apply our models to an analysis of photometric transit surveys, in particular the OGLE survey.
In order to do so we use a stellar field generator considering the different noise sources that can affect planetary transit search. We generate by Monte Carlo a population of planets that agrees with the radial velocity surveys. We then calculate the size of the planets using our models of planetary evolution and the magnitude of the transit events. These are compared to the yield of the planetary transit surveys including the noise thresholds.
Preliminary results indicate that indeed the presence of massive cores may corroborate the relative difficulty in finding giant transiting planets with present photometric surveys because of a radius which is on average smaller than previously thought.
Fressin François
Guillot Tristan
Morello Vincent
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