Planets Across Space and Time (PAST). I. Characterizing the Memberships of Galactic Components and Stellar Ages: Revisiting the Kinematic Methods and Applying to Planet Host Stars
Planets Across Space and Time (PAST). I. Characterizing the Memberships of Galactic Components and Stellar Ages: Revisiting the Kinematic Methods and Applying to Planet Host Stars
复制标题
跨越时空的行星（过去）。
DOI：
10.3847/1538-4357/abd5be
复制
发表时间：
2021-03-01
影响因子：
4.9
通讯作者：
Zheng, Zheng
中科院分区：
文献类型：
--
作者：
Chen, Di-Chang;Xie, Ji-Wei;Zheng, Zheng
超过 4000 颗系外行星已被识别，数千颗候选行星有待确认。这些行星系统的特征与其宿主恒星的运动学、银河系组成部分和年龄之间的关系尚未得到很好的探索。为了解决这些问题，我们开展了一个研究项目，称为跨时空行星（PAST）。为此，关键步骤之一是准确描述行星宿主恒星的特征。在本文中，即 PAST 系列的论文 I，我们重新审视了银河系成分分类的运动学方法，并将速度椭球体的适用范围从距太阳约 100 pc 扩展到 ∼ 1500 pc，以覆盖大多数已知的行星宿主。此外，我们重新审视了年龄-速度色散关系（AVR），它使我们能够推导出恒星群的运动年龄，其典型不确定性为 10-20%。应用上述修订后的方法，我们通过结合 Gaia、LAMOST、APOGEE、RAVE 和 NASA 系外行星档案的数据，提出了 2872 颗行星的 2174 颗主星的运动学属性目录（即银河位置、速度以及薄盘、厚盘、武仙流和晕之间的相对隶属概率）以及其他基本恒星参数。修订后的运动学方法和 AVR，以及运动学特性和年龄的恒星目录，为未来在银河系背景下的空间和时间研究奠定了基础。
Over 4000 exoplanets have been identified and thousands of candidates are to be confirmed. The relations between the characteristics of these planetary systems and the kinematics, Galactic components, and ages of their host stars have yet to be well explored. To address these questions, we conduct a research project, dubbed Planets Across Space and Time (PAST). To do this, one of the key steps is to accurately characterize the planet host stars. In this paper, Paper I of the PAST series, we revisit the kinematic method for classification of Galactic components and extend the applicable range of velocity ellipsoid from ∼100 pc to ∼1500 pc from the Sun in order to cover most known planet hosts. Furthermore, we revisit the age–velocity dispersion relation (AVR), which allows us to derive kinematic ages with a typical uncertainty of 10–20% for an ensemble of stars. Applying the above revised methods, 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 2174 host stars of 2872 planets by combining data from Gaia, LAMOST, APOGEE, RAVE, and the NASA exoplanet archive. The revised kinematic method and AVR, as well as the stellar catalog of kinematic properties and ages, lay the foundation for future studies of exoplanets in space and time in the Galactic context.