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

Date

2010-12

Authors

Gandolfi, D.
Hebrard, G.
Alonso, R.
Deleuil, M.
Guenther, E. W.
Fridlund, M.
Endl, M.
Eigmuller, P.
Csizmadia, S.
Havel, M.

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Abstract

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(circle dot), R() = 1.37 +/- 0.03 R(circle dot), T(eff) = 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 (upsilon sin i(star) = 40 +/- 5 km s(-1)) places CoRoT-11 among the most rapidly rotating planet host stars discovered so far. With a planetary mass of M(p) = 2.33 +/- 0.34 M(Jup) and radius R(p) = 1.43 +/- 0.03 R(Jup), the resulting mean density of CoRoT-11b (rho(p) = 0.99 +/- 0.15 g/cm(3)) 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.

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Citation

Gandolfi, D., G. Hébrard, R. Alonso, M. Deleuil, E. W. Guenther, M. Fridlund, M. Endl et al. >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.> Astronomy & Astrophysics, Vol. 524 (Dec., 2010): A55.