| Issue |
A&A
Volume 528, April 2011
|
|
|---|---|---|
| Article Number | A63 | |
| Number of page(s) | 5 | |
| Section | Planets and planetary systems | |
| DOI | https://doi.org/10.1051/0004-6361/201015764 | |
| Published online | 02 March 2011 | |
SOPHIE velocimetry of Kepler transit candidates⋆
II. KOI-428b: a hot Jupiter transiting a subgiant F-star
1
Laboratoire d’Astrophysique de Marseille, Université d’Aix-Marseille
& CNRS,
38 rue Frédéric Joliot-Curie,
13388
Marseille Cedex 13,
France
e-mail: alexandre.santerne@oamp.fr
2
Institut d’Astrophysique de Paris, UMR7095 CNRS, Université Pierre
& Marie Curie, 98bis
boulevard Arago, 75014
Paris,
France
3
Observatoire de Haute Provence, Université d’Aix-Marseille
& CNRS, 04670 Saint Michel l’Observatoire, France
4
Laboratoire d’Astrophysique de Grenoble, Université Joseph
Fourier, CNRS (UMR 5571), BP
53, 38041
Grenoble Cedex 9,
France
5
Observatoire de Genève, Université de Genève,
51 Ch. des
Maillettes, 1290
Sauverny,
Switzerland
Received:
15
September
2010
Accepted:
31
December
2010
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 RJup and a mass of 2.2 ± 0.4 MJup, orbits an F5IV star with R ⋆ = 2.13 ± 0.06 R⊙, M ⋆ = 1.48 ± 0.06 M⊙, and Teff = 6510 ± 100 K. The star KOI-428 is the largest and the most evolved star discovered so far with a transiting planet.
Key words: techniques: spectroscopic / techniques: radial velocities / techniques: photometric / planetary systems / stars: individual: KOI-428b
© ESO, 2011
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