HAT-P-3b: A heavy-element rich planet transiting a K dwarf star

Details HAT-P-3b: A heavy-element rich planet transiting a K dwarf star HAT-P-3b: A heavy-element rich planet transiting a K dwarf star

2007-07-28

arxiv.org/abs/0707.4268v1

Astrophys.J.666:L121-L124,2007

Astronomy and Astrophysics

Astrophysics

To appear in ApJL

Scientific paper

10.1086/521792

We report the discovery of a Jupiter-size planet transiting a relatively bright (V = 11.56) and metal-rich early K dwarf star with a period of about 2.9 days. On the basis of follow-up photometry and spectroscopy we determine the mass and radius of the planet, HAT-P-3b, to be M_p = 0.599 +/- 0.026 M_Jup and R_p = 0.890 +/- 0.046 R_Jup. The relatively small size of the object for its mass implies the presence of about 75 Earth masses worth of heavy elements (1/3 of the total mass) based on current theories of irradiated extrasolar giant planets, similar to the mass of the core inferred for the transiting planet HD 149026b. The bulk density of HAT-P-3b is found to be rho_p = 1.06 +/- 0.17 g/cm^3, and the planet orbits the star at a distance of 0.03894 AU. Ephemerides for the transit centers are T_c = 2,454,218.7594 +/- 0.0029 + N (2.899703 +/- 0.000054) (HJD).

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