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arXiv 2202.01798astro-ph.EPastro-ph.SR
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与TESS感兴趣的天体的伴星:伴星排列的检验

Stellar Companions to TESS Objects of Interest: A Test of Planet-Companion Alignment

Aida Behmard, Fei Dai, Andrew W. Howard

摘要:

我们提出了一个恒星同伴的目录,从边缘化的似然比测试,结合从盖亚早期数据发布3目录(EDR 3)的天体测量数据确定的凌日系外行星调查卫星感兴趣的对象(TOIs)的主机恒星。似然比计算使用概率模型,采用视差和自行协方差和边缘化的距离和3D速度的恒星,以确定共动恒星对。我们发现了172个共动的同伴,170个非假阳性TOI主机,包括168个系统与两个明星和2个系统与三星。在170个TOI主机中,有54个港口确认的行星跨越了广泛的系统架构。我们使用盖亚EDR 3对恒星伴星和行星轨道之间的相互倾斜进行了调查,这是可能的,因为过境系外行星必须在视线范围内运行;因此,恒星伴星运动学可以限制相互倾斜。虽然目前的样本的统计意义是弱的,我们发现,73 $^{+14}_{-20}\%$的系统与开普勒类架构($R_{P}$ $\leq$ 4 $R_\oplus$和$a$ $<$ 1 AU)似乎有利于一个非各向同性的取向之间的行星和同伴的轨道与一个典型的相互倾斜$α$ 35 $\pm$ 24 $^\circ$。相比之下,有65个$^{+20}_{-35}\%$的近距离巨星系统($P$ $<$ 10天和$R_{P}$ $>$ 4 $R_{\oplus}$)倾向于行星和伴星之间的垂直几何($α=$ 89 $\pm$ 21 $^\circ$)。此外,具有大恒星偏差(行星-主恒星偏差)的近距离巨星也是那些有利于显著行星-伴星偏差的巨星。

英文摘要:

We present a catalog of stellar companions to host stars of Transiting Exoplanet Survey Satellite Objects of Interest (TOIs) identified from a marginalized likelihood ratio test that incorporates astrometric data from the Gaia Early Data Release 3 catalog (EDR3). The likelihood ratio is computed using a probabilistic model that incorporates parallax and proper-motion covariances and marginalizes the distances and 3D velocities of stars in order to identify comoving stellar pairs. We find 172 comoving companions to 170 non-false-positive TOI hosts, consisting of 168 systems with two stars and 2 systems with three stars. Among the 170 TOI hosts, 54 harbor confirmed planets that span a wide range of system architectures. We conduct an investigation of the mutual inclinations between the stellar companion and planetary orbits using Gaia EDR3, which is possible because transiting exoplanets must orbit within the line of sight; thus, stellar companion kinematics can constrain mutual inclinations. While the statistical significance of the current sample is weak, we find that 73$^{+14}_{-20}\%$ of systems with Kepler-like architectures ($R_{P}$ $\leq$ 4 $R_\oplus$ and $a$ $<$ 1 AU) appear to favor a nonisotropic orientation between the planetary and companion orbits with a typical mutual inclination $α$ of 35 $\pm$ 24$^\circ$. In contrast, 65$^{+20}_{-35}\%$ of systems with close-in giants ($P$ $<$ 10 days and $R_{P}$ $>$ 4 $R_{\oplus}$) favor a perpendicular geometry ($α=$ 89 $\pm$ 21$^\circ$) between the planet and companion. Moreover, the close-in giants with large stellar obliquities (planet-host misalignment) are also those that favor significant planet-companion misalignment.

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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