First atmospheric study of the young massive planet CoRoT-Exo-2b

Details First atmospheric study of the young massive planet CoRoT-Exo-2b First atmospheric study of the young massive planet CoRoT-Exo-2b

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop..486g&link_type=abstract

Spitzer Proposal ID #486

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Scientific paper

CoRoT-Exo-2b is the second transiting planet discovered by CoRoT, the first space transit survey. Compared to other transiting planets, CoRoT-Exo-2b is very peculiar. The 150 days long CoRoT photometric time series and the spectral analysis of the host star show that this G7 dwarf is still close to the ZAMS and is thus younger than 0.5 Gyr. With a planetary radius of 1.465 +/- 0.029 RJup, a mass of 3.31 +/- 0.16 MJup, the planet density is very close to the value for Jupiter. This is rather surprising because massive planets are supposed to get rapidly a radius comparable to Jupiter's. It is tempting to propose that the small density of CoRoT-Exo-2b is due to its very young age: this bloated planet would still be cooling. Unlike the 3 other known massive transiting planets, the very large stellar flux received by CoRoT-Exo-2b clearly puts it in the 'pM' class proposed by Fortney et al., and one should expect very deep IR secondary eclipses for this planet. We request 5.7 hrs to observe a secondary eclipse of CoRoT-Exo-2b with IRAC's simultaneously on 4.5 and 8um channels. Our observations will be an interesting test for the theory proposed by Fortney et al., and also a new important piece of information to understand the radius anomaly of bloated close-in planets. Its location in a mass-radius diagram and its youngness distinguish it clearly from other transiting planets and brings a unique opportunity to study the atmosphere of a massive planet in an early phase of its evolution.

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