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Post Info TOPIC: KOI-1299b
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RE: KOI-1299b
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Title: KOI-1299 b: a massive planet in a highly eccentric orbit transiting a red giant
Author: Simona Ciceri, Jorge Lillo-Box, John Southworth, Luigi Mancini, Thomas Henning, David Barrado

We confirm the planetary nature of the Kepler object of interest KOI-1299 b. 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 a simultaneous fit of these new data and Kepler photometry, we found that KOI-1299 b is a dense transiting exoplanet, having a mass of Mp = 4.87 ± 0.48 MJup and radius of Rp = 1.120 ± 0.036 RJup. The planet revolves around a K giant star, ascending the red giant branch, every 52.5 d, moving on a highly eccentric orbit with e = 0.535 ± 0.030. By analysing two NIR high-resolution images, we found that a star occurs at 1.1 from KOI-1299, but it is too faint to cause significant effects on the transit depth. Together with Kepler-56 and Kepler-91, KOI-1299 occupies an almost-desert region of parameter space, which is important to constrain the evolutionary processes of planetary systems.

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Title: Spectroscopic confirmation of KOI-1299b: a massive warm Jupiter in a 52-day eccentric orbit transiting a giant star
Author: Mauricio Ortiz, Davide Gandolfi, Sabine Reffert, Andreas Quirrenbach, Hans J. Deeg, Raine Karjalainen, Pilar Montañes-Rodríguez, Davide Nespral, Grzegorz Nowak, Yeisson Osorio, Enric Palle

Context: Planets around evolved stars exhibit different properties than those orbiting main-sequence stars. One of the most notable differences is the paucity of planets orbiting at short distance from giant stars (a <0.5 AU). Detecting these rare close-in planets can shed light on planetary system formation and evolution mechanisms. Aims: We study the Kepler object KOI-1299, an evolved star ascending the red giant branch. We aim at confirming the planetary nature of the Jupiter-like transit signal recurring every ~52.5 days, and characterizing the orbital elements of the system. Methods: We derive radial velocities from multi-epoch high-resolution spectra of KOI-1299 acquired with CAFE at the 2.2m telescope of Calar Alto Observatory and FIES at the 2.56m Nordic Optical Telescope of Roque de los Muchachos Observatory. Results: We confirm the planetary nature of the transiting object KOI-1299b. We find a planetary mass of Mp=5.86 ± 0.05 Mjup and an eccentricity of e=0.479 ± 0.004. With a semi-major axis of a=0.304 ± 0.007 AU, KOI-1299b is the first bona-fide warm-Jupiter detected to transit a giant star. 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. Current models of planetary evolution in the post main-sequence phase predict that KOI-1299b will be most likely engulfed by its host star before the latter reaches the tip of the red giant branch.

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