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We study the Kepler object Kepler-432, an evolved star ascending the redgiant branch. By deriving precise radial velocities from multi-epochhigh-resolution spectra of Kepler-432 taken with the CAFE spectrograph at the2.2m telescope of Calar Alto Observatory and the FIES spectrograph at theNordic Optical Telescope of Roque de Los Muchachos Observatory, we confirm theplanetary nature of the object Kepler-432 b, which has a transit period of 52days. We find a planetary mass of Mp=5.84 +\- 0.05 Mjup and a high eccentricityof e=0.478 +\- 0.004. With a semi-major axis of a=0.303 +\- 0.007 AU,Kepler-432 b is the first bona fide warm Jupiter detected to transit a giantstar. We also find a radial velocity linear trend of 0.44 +\- 0.04 m s$^{-1}$d$^{-1}$, which suggests the presence of a third object in the system. Currentmodels of planetary evolution in the post-main-sequence phase predict thatKepler-432 b will be most likely engulfed by its host star before the latterreaches the tip of the red giant branch.

Kepler-432 b: a massive warm Jupiter in a 52-day eccentric orbit transiting a giant star