Volatile enrichments and composition of carbon-rich giant planets: the case of WASP-12b

Details Volatile enrichments and composition of carbon-rich giant planets: the case of WASP-12b Volatile enrichments and composition of carbon-rich giant planets: the case of WASP-12b

Oct 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf..371m&link_type=abstract

EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.371

Computer Science

Scientific paper

Carbon-rich planets (CRPs) are the exotic new members in the repertoire of extrasolar planets. We define a CRP as a planet with a carbon to oxygen (C/O) ratio 1. The first CRP atmosphere was inferred recently for the very hot Jupiter WASP-12b [1]. Here we show that it is not possible to reproduce the C/O ratio 1 observed in WASP-12b via the accretion of planetesimals formed in a disk whose gas phase elemental composition is similar to the one of the parent star. In order to reproduce the observed C/O ratio in the planet, one needs to invoke an oxygen abundance which is depleted by a factor of roughly two compared to that of the parent star, with the exact value contingent on the volatile-to-silicate fraction.

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