A SHORT-PERIOD CENSOR OF SUB-JUPITER MASS EXOPLANETS WITH LOW DENSITY
A SHORT-PERIOD CENSOR OF SUB-JUPITER MASS EXOPLANETS WITH LOW DENSITY
复制标题
木星下低密度系外行星质量短周期观测器
DOI：
10.1088/2041-8205/727/2/l44
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
László L. Kiss
中科院分区：
文献类型：
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作者：
Gy. M. Szabó;Gy. M. Szabó;László L. Kiss;László L. Kiss
尽管存在许多短周期的热海王星，但没有一个热海王星的轨道周期小于2.5天。在这里，我们讨论了目前已知的106个凌日系外行星的聚类分析，以调查这一观察结果的可能解释。我们在质量密度空间中发现了两个不同的星团，一个是轨道周期范围很宽（0.8-114天）和行星半径范围很窄（1.2 ± 0.2 RJ）的热彗星，另一个是超级地球，热海王星和热彗星的混合物，表现出令人惊讶的窄周期分布（3.7 ± 0.8天）。这两个集群在周期半径参数平面上遵循截然不同的分布。亚木星质量的系外行星的分支在大半径端的轨道周期被审查：没有已知的行星质量在0.02到0.8 MJ之间或半径在0.25到1.0 RJ之间，Porb < 2.5天。目前的行星形成和演化理论并没有预测到这种集群，我们也简要回顾了这一点。
Despite the existence of many short-period hot Jupiters, there is not one hot Neptune with an orbital period less than 2.5 days. Here, we discuss a cluster analysis of the currently known 106 transiting exoplanets to investigate a possible explanation for this observation. We find two distinct clusters in the mass–density space, one with hot Jupiters with a wide range of orbital periods (0.8–114 days) and a narrow range of planet radii (1.2 ± 0.2 RJ) and another one with a mixture of super-Earths, hot Neptunes, and hot Jupiters, exhibiting a surprisingly narrow period distribution (3.7 ± 0.8 days). These two clusters follow strikingly different distributions in the period–radius parameter plane. The branch of sub-Jupiter mass exoplanets is censored by the orbital period at the large-radius end: no planets with mass between 0.02 and 0.8 MJ or with radius between 0.25 and 1.0 RJ are known with Porb < 2.5 days. This clustering is not predicted by current theories of planet formation and evolution, which we also review briefly.