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arXiv 1804.04662astro-ph.SR
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APOGEE DR14中演化恒星的双星伴星:约5,000颗伴星的搜寻方法和星表

Binary companions of evolved stars in APOGEE DR14: Search method and catalog of ~5,000 companions

Adrian M. Price-Whelan, David W. Hogg, Hans-Walter Rix, Nathan De Lee, Steven R. Majewski, David L. Nidever, Nicholas Troup, José G. Fernández-Trincado, Domingo… 展开作者

Adrian M. Price-Whelan, David W. Hogg, Hans-Walter Rix, Nathan De Lee, Steven R. Majewski, David L. Nidever, Nicholas Troup, José G. Fernández-Trincado, Domingo A. García-Hernández, Penélope Longa-Peña, Christian Nitschelm, Jennifer Sobeck, Olga Zamora

摘要:

恒星的多历元径向速度测量可以用来识别恒星,亚恒星和行星质量的同伴。即使是少量的观测时期也可以提供关于伴星的信息,尽管可能有多个质量不同的轨道解来拟合数据。我们已经定制了一个蒙特卡洛采样器(The Monte Carlo sampler),它可以为给定稀疏径向速度数据的同伴轨道参数提供可靠的(通常是高度多模态的)后验采样。在这里,我们使用该望远镜来搜索在APOGEE巡天(DR 14)中用$\geq 3$光谱历元观测到的96,231颗红巨星的伴星。我们选择恒星与可能的同伴作出削减我们的后相信的幅度恒星径向速度变化引起的轨道。我们提供了(1)320颗伴星的星表,可以确定伴星的性质;(2)4,898颗可能有伴星的星表,但需要更多的观测来确定轨道性质;(3)母星样本中所有恒星的完整轨道参数的后验采样。我们展示了系统的特点,自信地确定同伴的属性和突出有趣的系统与候选紧凑的对象同伴。

英文摘要:

Multi-epoch radial velocity measurements of stars can be used to identify stellar, sub-stellar, and planetary-mass companions. Even a small number of observation epochs can be informative about companions, though there can be multiple qualitatively different orbital solutions that fit the data. We have custom-built a Monte Carlo sampler (The Joker) that delivers reliable (and often highly multi-modal) posterior samplings for companion orbital parameters given sparse radial-velocity data. Here we use The Joker to perform a search for companions to 96,231 red-giant stars observed in the APOGEE survey (DR14) with $\geq 3$ spectroscopic epochs. We select stars with probable companions by making a cut on our posterior belief about the amplitude of the stellar radial-velocity variation induced by the orbit. We provide (1) a catalog of 320 companions for which the stellar companion properties can be confidently determined, (2) a catalog of 4,898 stars that likely have companions, but would require more observations to uniquely determine the orbital properties, and (3) posterior samplings for the full orbital parameters for all stars in the parent sample. We show the characteristics of systems with confidently determined companion properties and highlight interesting systems with candidate compact object companions.

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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