SOPHIE velocimetry of Kepler transit candidates II. KOI-428b: a hot Jupiter transiting a subgiant F-star

作者：Santerne A^*; Diaz R F; Bouchy F; Deleuil M; Moutou C; Hebrard G; Eggenberger A; Ehrenreich D; Gry C; Udry S

来源：Astronomy & Astrophysics, 2011, 528: A63.

DOI：10.1051/0004-6361/201015764

• techniques: spectroscopic
• techniques: radial velocities
• techniques: photometric
• planetary systems
• stars: individual: KOI-428b

We report the discovery of a hot Jupiter transiting a subgiant star with an orbital period of 6.87 days. This discovery was aided by public photometric data from the Kepler space mission and new radial velocity observations obtained by the SOPHIE spectrograph. The planet KOI-428b, with a radius of 1.17 +/- 0.04 R(Jup) and a mass of 2.2 +/- 0.4 M(Jup), orbits an F5IV star with R(star) = 2.13 +/- 0.06 R(circle dot), M(star) = 1.48 +/- 0.06 M(circle dot), and T(eff) = 6510 +/- 100 K. The star KOI-428 is the largest and the most evolved star discovered so far with a transiting planet.

• 出版日期2011-4