Volume 554, June 2013
|Number of page(s)||10|
|Section||Planets and planetary systems|
|Published online||13 June 2013|
KOI-200 b and KOI-889 b: Two transiting exoplanets detected and characterized with Kepler, SOPHIE, and HARPS-N
1 Institut d’Astrophysique de Paris, UMR7095 CNRS, Université Pierre & Marie Curie, 98bis boulevard Arago, 75014 Paris, France
2 Observatoire de Haute-Provence, CNRS/OAMP, 04870 Saint-Michel-l’ Observatoire, France
3 Aix Marseille Université, CNRS, LAM (Laboratoire d’Astrophysique de Marseille) UMR 7326, 13388 Marseille, France
4 Centro de Astrofísica, Universidade do Porto, Rua das Estrelas, 4150-762 Porto, Portugal
5 INAF – Osservatorio Astrofisico di Torino, via Osservatorio 20, 10025 Pino Torinese, Italy
Received: 3 March 2013
Accepted: 22 April 2013
We present the detection and characterization of the two new transiting, close-in, giant extrasolar planets KOI-200 b and KOI-889 b. They were first identified by the Kepler team as promising candidates from photometry of the Kepler satellite; we then established their planetary nature thanks to the radial velocity follow-up jointly secured with the spectrographs SOPHIE and HARPS-N. Combined analyses of the whole datasets allow the two planetary systems to be characterized. The planet KOI-200 b has mass and radius of 0.68 ± 0.09 MJup and 1.32 ± 0.14 RJup; it orbits in 7.34 days a F8V host star with mass and radius of 1.40-0.11+0.14 M⊙ and 1.51 ± 0.14 R⊙. The planet KOI-889 b is a massive planet with mass and radius of 9.9 ± 0.5 MJup and 1.03 ± 0.06 RJup; it orbits in 8.88 days an active G8V star with a rotation period of 19.2 ± 0.3 days, and mass and radius of 0.88 ± 0.06 M⊙ and 0.88 ± 0.04 R⊙. Both planets lie on eccentric orbits and are located just at the frontier between regimes where tides can explain circularization and where tidal effects are negligible. The two planets are among the first detected and characterized thanks to observations secured with HARPS-N, the new spectrograph recently mounted at the Telescopio Nazionale Galileo. These results illustrate the benefits that could be obtained from joint studies using two spectrographs as SOPHIE and HARPS-N.
Key words: planets and satellites: detection / techniques: photometric / techniques: radial velocities / techniques: spectroscopic / stars: individual: KOI-200 (Kepler-74) / stars: individual: KOI-889 (Kepler-75)
© ESO, 2013
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