Interpreting the results of transit surveys to characterize giant planets

Details Interpreting the results of transit surveys to characterize giant planets Interpreting the results of transit surveys to characterize giant planets

Aug 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007epsc.conf..817f&link_type=abstract

European Planetary Science Congress 2007, Proceedings of a conference held 20-24 August, 2007 in Potsdam, Germany. Online at ht

Computer Science

Scientific paper

Transiting extrasolar planets are now discovered jointly by photometric surveys and by radial velocimetry, allowing measurements of their radius and mass. We simulate directly a population of stars corresponding to the OGLE transit survey and assign them planetary companions based on the list of extrasolar planets discovered by radial velocimetry. We use a model of the evolution and structure of giant planets that assumes that they are made of hydrogen and helium and of a variable fraction of heavy elements. The output list of detectable planets of the simulations is compared to the real detections. We show that evolution models fitting present observational constraints predict a lack of small giant planets with large masses. We also identify that the lack of planets oribiting metal-poor stars is even more marked at short periods (less than 10 days). We further confirm the relative absence of low-mass giant planets at very small orbital distances. Testing these results and the underlying planetary evolution models requires the detection of a statistically significant number of transiting planets, which should be provided over the next few years by continued ground-based photometric surveys, the space missions CoRoT and Kepler, and combined radial velocity measurements.

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