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Kepler-432 b: a massive planet in a highly eccentric orbit transiting a red giant

Ciceri, S.; Lillo-Box, J.; Southworth, J.; Mancini, L.; Th. Henning; Barrado, D.

Kepler-432 b: a massive planet in a highly eccentric orbit transiting a red giant Thumbnail


S. Ciceri

J. Lillo-Box

L. Mancini

Th. Henning

D. Barrado


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.

Journal Article Type Article
Acceptance Date Nov 28, 2014
Online Publication Date Dec 22, 2014
Publication Date 2015-01
Print ISSN 0004-6361
Electronic ISSN 1432-0746
Publisher EDP Sciences
Peer Reviewed Peer Reviewed
Volume 573
Article Number L5
Keywords planetary systems, stars: fundamental parameters, stars: individual: Kepler-432
Publisher URL


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