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arXiv 2407.20138astro-ph.SRastro-ph.EP
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太阳系邻域中带有行星的恒星的多重性

Multiplicity of stars with planets in the solar neighbourhood

J. González-Payo, J. A. Caballero, J. Gorgas, M. Cortés-Contreras, M. -C. Gálvez-Ortiz, C. Cifuentes

AI总结:

本研究利用 Gaia DR3 数据分析了 100 pc 内系外行星宿主恒星的多重性,发现多重系统中的行星具有更高轨道偏心率,且高质量行星倾向位于近轨道。

摘要:

目标:我们旨在量化恒星多重性对系外行星的存在和性质的影响。方法:我们利用来自 Gaia DR3 的最新天体测量数据和先进的统计方法,研究了距离 100 pc 以内的所有系外行星宿主恒星。我们利用华盛顿双星星表和文献中的数据,补充了对自行和视差伴星的搜索。在根据径向速度数据、星团和疏散星协成员资格或已分辨的超冷伴星排除了部分系统后,我们保留了 212 个多重恒星系统中的 215 颗系外行星宿主恒星。结果:我们在 15 颗已知系外行星宿主恒星的系统中发现了 17 颗新伴星,测量了 236 对恒星的精确角距离和投影物理分离及位置角,汇编了多重系统中 276 颗行星的关键参数,并建立了一个包含 687 颗带有系外行星的单星的比较样本。基于这些数据,我们对一系列关于多重恒星系统中行星的假设进行了统计分析。尽管这些结果仅在 2σ 水平上具有统计显著性,我们的分析仍指出了几个有趣的结论,涉及多重与单恒星系统中行星平均数量的比较,以及高质量行星倾向于位于多重系统中更近轨道的趋势。我们证实,多重系统中的行星往往比单星系统中的行星具有更大偏心率的轨道。特别是,我们发现了一个显著的(> 4σ)偏好,即当恒星-恒星投影物理分离与恒星-行星半长轴之比较小时,行星更倾向于表现出高轨道偏心率。

英文摘要:

- Aims: We intended to quantify the impact of stellar multiplicity on the presence and properties of exoplanets. - Methods: We investigated all exoplanet host stars at less than 100 pc using the latest astrometric data from Gaia DR3 and advanced statistical methodologies. We complemented our search for common proper motion and parallax companions with data from the Washington Double Star catalogue and the literature. After excluding a number of systems based on radial velocity data, and membership in clusters and open associations, or with resolved ultracool companions, we kept 215 exoplanet host stars in 212 multiple-star systems. - Results: We found 17 new companions in the systems of 15 known exoplanet host stars, measured precise angular and projected physical separations and position angles for 236 pairs of stars, compiled key parameters for 276 planets in multiple systems, and established a comparison sample comprising 687 single stars with exoplanets. With all of this, we statistically analysed a series of hypothesis regarding planets in multiple stellar systems. Although they are only statistically significant at a 2σ level, our analysis pointed to several interesting results on the comparison in the mean number of planets in multiple versus single stellar systems and the tendency of high mass planets to be located in closer orbits in multiple systems. We confirm that planets in multiple systems tend to have orbits with larger eccentricities than those in single systems. In particular, we found a significant (> 4σ) preference for planets to exhibit high orbital eccentricities at small ratios between star-star projected physical separations and star-planet semi-major axes.

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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