Observational evidence for two distinct giant planet populations
Observational evidence for two distinct giant planet populations
复制标题
两个不同巨行星群的观测证据
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
A. C. S. Ferreira
中科院分区：
文献类型：
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作者：
N. Santos;V. Adibekyan;P. Figueira;D. Andreasen;S. Barros;E. Delgado;O. Demangeon;J. Faria;M. Oshagh;S. Sousa;P. T. P. Viana;A. C. S. Ferreira
对系外行星及其宿主恒星的统计特性的分析为行星形成和演化过程提供了独特的视角。在这篇论文中，我们探索了太阳型恒星的巨行星伴星的质量分布特性，以寻求它们形成过程的线索。考虑到这一目标，我们在标准统计检验的帮助下，使用来自exoplanet.eu目录和SWEET-Cat数据库的数据研究了巨行星的质量分布。我们表明，质量分布的巨行星的同伴很可能是目前一个以上的人口与政权的变化约4，M $_{Jup}$。高于这个值，主星往往更贫金属，质量更大，[Fe/H]分布在统计上与类似质量的场星中观察到的相似。另一方面，在这个极限之下的恒星的行星显示出众所周知的金属性-巨行星频率相关性。我们讨论了这些结果在各种行星形成模型，并探讨它们可能对我们的理解的巨行星的形成的影响。特别是，我们讨论的可能性，即存在两个独立的人口的巨行星表明，两个不同的形成过程中发挥作用。
Analysis of the statistical properties of exoplanets, together with those of their host stars, are providing a unique view into the process of planet formation and evolution. In this paper we explore the properties of the mass distribution of giant planet companions to solar-type stars, in a quest for clues about their formation process. With this goal in mind we studied, with the help of standard statistical tests, the mass distribution of giant planets using data from the exoplanet.eu catalog and the SWEET-Cat database of stellar parameters for stars with planets. We show that the mass distribution of giant planet companions is likely to present more than one population with a change in regime around 4,M$_{Jup}$. Above this value host stars tend to be more metal poor and more massive and have [Fe/H] distributions that are statistically similar to those observed in field stars of similar mass. On the other hand, stars that host planets below this limit show the well-known metallicity-giant planet frequency correlation. We discuss these results in light of various planet formation models and explore the implications they may have on our understanding of the formation of giant planets. In particular, we discuss the possibility that the existence of two separate populations of giant planets indicates that two different processes of formation are at play.