Volume 573, January 2015
|Number of page(s)||4|
|Published online||22 December 2014|
Kepler-432 b: a massive planet in a highly eccentric orbit transiting a red giant ⋆
Max Planck Institute for Astronomy, Königstuhl 17, 69117, Heidelberg, Germany
2 Departamento de Astrofísica, Centro de Astrobiología (CSIC-INTA), 28691 Villanueva de la Cañada, Madrid, Spain
3 Astrophysics Group, Keele University, Staffordshire, ST5 5BG, UK
Received: 10 October 2014
Accepted: 28 November 2014
We report the first disclosure of the planetary nature of Kepler-432 b (aka Kepler object of interest KOI-1299.01). We accurately constrained its mass and eccentricity by high-precision radial velocity measurements obtained with the CAFE spectrograph at the CAHA 2.2-m telescope. By simultaneously fitting these new data and Kepler photometry, we found that Kepler-432 b is a dense transiting exoplanet with a mass of Mp = 4.87 ± 0.48MJup and radius of Rp = 1.120 ± 0.036RJup. The planet revolves every 52.5 d around a K giant star that ascends the red giant branch, and it moves on a highly eccentric orbit with e = 0.535 ± 0.030. By analysing two near-IR high-resolution images, we found that a star is located at 1.1′′ from Kepler-432, but it is too faint to cause significant effects on the transit depth. Together with Kepler-56 and Kepler-91, Kepler-432 occupies an almost-desert region of parameter space, which is important for constraining the evolutionary processes of planetary systems.
Key words: planetary systems / stars: fundamental parameters / stars: individual: Kepler-432
RV data (Table A.1) are only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (18.104.22.168) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/573/L5
© ESO, 2014
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