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arXiv 1410.3000astro-ph.EP
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开普勒-432b:一颗巨大的温暖木星,在一个52天的偏心轨道上经过一颗巨星

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

Mauricio Ortiz, Davide Gandolfi, Sabine Reffert, Andreas Quirrenbach, Hans J. Deeg, Raine Karjalainen, Pilar Montañes-Rodríguez, David Nespral, Grzegorz Nowak, … 展开作者

Mauricio Ortiz, Davide Gandolfi, Sabine Reffert, Andreas Quirrenbach, Hans J. Deeg, Raine Karjalainen, Pilar Montañes-Rodríguez, David Nespral, Grzegorz Nowak, Yeisson Osorio, Enric Palle

摘要:

我们研究开普勒天体Kepler-432,一颗在红巨星分支上升的演化恒星。本文利用卡拉阿尔托天文台2.2米望远镜的CAFE摄谱仪和罗克德洛斯穆查丘斯天文台北欧光学望远镜的FIES摄谱仪对Kepler-432的多历元高分辨率光谱进行了精确的视向速度计算,证实了Kepler-432 b的行星性质,它的凌日周期为52天。我们发现一个行星的质量为Mp=5.84 + 0.05 Mjup和一个高离心率为e=0.478 + 0.004。开普勒-432 b的半长轴为a=0.303 +\- 0.007 AU,是第一个真正的温暖木星被发现过境的巨星。我们还发现一个径向速度的线性趋势为0.44 +\- 0.04 m s $^{-1}$ d $^{-1}$,这表明在系统中存在第三个对象。目前的行星演化模型预测,开普勒-432 b在到达红巨星分支的顶端之前,很可能会被它的宿主恒星吞没。

英文摘要:

We study the Kepler object Kepler-432, an evolved star ascending the red giant branch. By deriving precise radial velocities from multi-epoch high-resolution spectra of Kepler-432 taken with the CAFE spectrograph at the 2.2m telescope of Calar Alto Observatory and the FIES spectrograph at the Nordic Optical Telescope of Roque de Los Muchachos Observatory, we confirm the planetary nature of the object Kepler-432 b, which has a transit period of 52 days. We find a planetary mass of Mp=5.84 +\- 0.05 Mjup and a high eccentricity of 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 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 Kepler-432 b will be most likely engulfed by its host star before the latter reaches the tip of the red giant branch.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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