Transiting exoplanets from the CoRoT space mission - XIV. CoRoT-11b: a transiting massive “hot-Jupiter” in a prograde orbit around a rapidly rotating F-type star

摘要

The CoRoT?exoplanet science team announces the discovery of CoRoT-11b, a fairly massive hot-Jupiter transiting a V?=?12.9?mag F6 dwarf star (M??=?1.27?±?0.05?M⊙, R??=?1.37?±?0.03?R⊙, Teff?=?6440?±?120?K), with an orbital period of P?=?2.994329?±?0.000011?days and semi-major axis a?=?0.0436?±?0.005?AU. The detection of part of the radial velocity anomaly caused by the Rossiter-McLaughlin effect shows that the transit-like events detected by CoRoT?are caused by a planet-sized transiting object in a prograde orbit. The relatively high projected rotational velocity of the star (vsini????=?40?±?5?km?s-1) places CoRoT-11 among the most rapidly rotating planet host stars discovered so far. With a planetary mass of Mp??=?2.33?±?0.34?MJup?and radius Rp??=?1.43?±?0.03?RJup, the resulting mean density of CoRoT-11b (ρp?=?0.99?±?0.15?g/cm3) can be explained with a model for an inflated hydrogen-planet with a solar composition and a high level of energy dissipation in its interior.