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Planets Across Space and Time (PAST). II. Catalog and Analyses of the LAMOST–Gaia–Kepler Stellar Kinematic Properties
The Astronomical Journal ( IF 5.1 ) Pub Date : 2021-08-13 , DOI: 10.3847/1538-3881/ac0f08
Di-Chang Chen 1, 2 , Jia-Yi Yang 1, 2 , Ji-Wei Xie 1, 2 , Ji-Lin Zhou 1, 2 , Subo Dong 3 , Zheng Zheng 4 , Jing-Hua Zhang 5 , Chao Liu 6, 7 , Hai-Feng Wang 8, 9 , Mao-Sheng Xiang 5, 10 , Weikai Zong 11 , Yang Huang 8 , Ali Luo 5
Affiliation  

The Kepler telescope has discovered over 4000 planets (candidates) by searching ∼200,000 stars over a wide range of distance (order of kpc) in our Galaxy. Characterizing the kinematic properties (e.g., Galactic component membership and kinematic age) of these Kepler targets (including the planet candidate hosts) is the first step toward studying Kepler planets in the Galactic context, which will reveal fresh insights into planet formation and evolution. In this paper, the second part of the Planets Across the Space and Time (PAST) series, by combining the data from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) and Gaia and then applying the revised kinematic methods from PAST I, we present a catalog of kinematic properties (i.e., Galactic positions, velocities, and the relative membership probabilities among the thin disk, thick disk, Hercules stream, and the halo) as well as other basic stellar parameters for 35,835 Kepler stars. Further analyses of the LAMOST–Gaia–Kepler catalog demonstrate that our derived kinematic age reveals the expected stellar activity-age trend. Furthermore, we find that the fraction of thin (thick) disk stars increases (decreases) with the transiting planet multiplicity (N p = 0, 1, 2 and 3+) and the kinematic age decreases with N p, which could be a consequence of the dynamical evolution of planetary architecture with age. The LAMOST–Gaia–Kepler catalog will be useful for future studies on the correlations between the exoplanet distributions and the stellar Galactic environments as well as ages.



中文翻译:

跨越时空的行星(过去)。二、LAMOST-Gaia-Kepler 恒星运动学特性的目录和分析

开普勒望远镜通过在我们银河系中在很宽的距离范围内(kpc 量级)搜索 200,000 颗恒星,发现了 4000 多颗行星(候选行星)。表征这些开普勒目标(包括行星候选宿主)的运动学特性(例如,银河成分成员资格和运动年龄)是在银河系背景下研究开普勒行星的第一步,这将揭示对行星形成和演化的新见解。在本文中,行星穿越时空 (PAST) 系列的第二部分,通过结合来自大天区多目标光纤光谱望远镜 (LAMOST) 和盖亚的数据,然后应用来自 PAST I 的修正运动学方法,我们提供了一个运动学特性目录(即,星系位置、速度和薄盘之间的相对隶属概率,厚盘、大力神流和光晕)以及 35,835 颗开普勒星的其他基本恒星参数。对 LAMOST-Gaia-Kepler 星表的进一步分析表明,我们推导出的运动年龄揭示了预期的恒星活动年龄趋势。此外,我们发现薄(厚)盘星的比例随着行进行星的多样性增加(减少)(N p = 0, 1, 2 and 3+) 并且运动学年龄随N p减小,这可能是行星结构随年龄而动态演化的结果。LAMOST-Gaia-Kepler 目录将有助于未来研究系外行星分布与恒星银河环境以及年龄之间的相关性。

更新日期:2021-08-13
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