轨道偏心率 - 行星系统的多重相关性以及与太阳系的比较,Monthly Notices of the Royal Astronomical Society

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轨道偏心率 - 行星系统的多重相关性以及与太阳系的比较
Monthly Notices of the Royal Astronomical Society ( IF 4.7 ) Pub Date : 2020-10-30 , DOI: 10.1093/mnras/staa3321
Nanna Bach-Møller ₁ , Uffe G Jørgensen ₁

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与已知系外行星系统的平均值相比，太阳系行星的轨道偏心率异常低。对于多重性大于 2 的系统，先前已发现行星系统的多重性与其组成部分的轨道偏心率之间存在幂律相关性。在这项研究中，我们通过将行星系统作为单位来研究扩展数据样本的相关性（与之前的研究侧重于单个行星不同）。我们的完整数据样本包含 895 个系统中的 1171 颗系外行星，并且发现离心率和多重性之间的相关性对于高于 1 的所有多重性都遵循明确的幂律。我们讨论了几个单独子样本的相关性，并发现所有样本始终遵循相同的基本趋势，无论例如行星类型和检测方法。我们发现太阳系的离心率符合总体趋势，并表明与“标准”行星系统相比，太阳系可能不会表现出异常低的离心率（正如经常推测的那样），而是异常多的行星。幂律相关性的唯一异常值是所有样本中一致的单行星系统。之前曾有人提出，这可能是由于在观测到的单行星系统中存在额外的看不见的系外行星。基于这个假设和幂律相关性，我们估计一个系统有 8 个或更多行星的概率约为 1%，这与基于独立论证的分析的最新预测非常一致。我们发现太阳系的离心率符合总体趋势，并表明与“标准”行星系统相比，太阳系可能不会表现出异常低的离心率（正如经常推测的那样），而是异常多的行星。幂律相关性的唯一异常值是所有样本中一致的单行星系统。之前曾有人提出，这可能是由于在观测到的单行星系统中存在额外的看不见的系外行星。基于此假设和幂律相关性，我们估计系统具有 8 颗或更多行星的概率约为 1%，这与基于独立论证的分析的最新预测非常一致。我们发现太阳系的离心率符合总体趋势，并表明与“标准”行星系统相比，太阳系可能不会表现出异常低的离心率（正如经常推测的那样），而是异常多的行星。幂律相关性的唯一异常值是所有样本中一致的单行星系统。之前曾有人提出，这可能是由于在观测到的单行星系统中存在额外的看不见的系外行星。基于此假设和幂律相关性，我们估计系统具有 8 颗或更多行星的概率约为 1%，这与基于独立论证的分析的最新预测非常一致。

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Orbital Eccentricity - Multiplicity Correlation for Planetary Systems and Comparison to the Solar System

The orbit eccentricities of the Solar System planets are unusually low compared to the average of known exoplanetary systems. A power law correlation has previously been found between the multiplicity of a planetary system and the orbital eccentricities of its components, for systems with multiplicities above two. In this study we investigate the correlation for an expanded data sample, by focusing on planetary systems as units (unlike previous studies that have focused on individual planets). Our full data sample contains 1171 exoplanets, in 895 systems, and the correlation between eccentricity and multiplicity is found to follow a clear power law for all multiplicities above one. We discuss the correlation for several individual subsamples, and find that all samples consistently follow the same basic trend regardless of e.g. planet types and detection methods. We find that the eccentricities of the Solar System fit the general trend and suggest that the Solar System might not show uncommonly low eccentricities (as often speculated) but rather uncommonly many planets compared to a "standard" planetary system. The only outlier from the power law correlation is, consistently in all the samples, the one-planet systems. It has previously been suggested that this may be due to additional unseen exoplanets in the observed one-planet systems. Based on this assumption and the power law correlation, we estimate that the probability of a system having 8 planets or more is of the order of 1%, in good agreement with recent predictions from analyses based on independent arguments.

更新日期：2020-10-30

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