A Gap in the Mass Distribution for Warm Neptune and Terrestrial Planets
A Gap in the Mass Distribution for Warm Neptune and Terrestrial Planets
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DOI：
10.3847/2041-8213/ab2ba2
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发表时间：
2019-06
期刊：
影响因子：
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通讯作者：
David J Armstrong;F. Meru;D. Bayliss;G. Kennedy;D. Veras
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文献类型：
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作者：
David J Armstrong;F. Meru;D. Bayliss;G. Kennedy;D. Veras
行星分布中的结构提供了对塑造行星形成和演化过程的洞察。开普勒使命在行星半径方面带来了丰富的统计发现，但观测到的具有测量质量的行星数量要少得多。通过结合最近的质量测定计划的结果，我们发现了一个新的差距出现在行星人口的亚海王星质量的行星轨道周期小于20天。差距的质量随着轨道周期的增加而减少，宽度为几个M，并且可能完全没有行星。拟合高斯混合模型的行星人口在这个地区有利于一个双模型分布在一个单一的贝叶斯信息标准的减少19.9，突出了差距的意义。我们讨论了几个过程，可以产生这样一个功能的行星分布，包括堆积的行星以上的差距地区，潮汐与主机星星的相互作用，动态的相互作用与磁盘，与其他行星，或吸积材料在形成过程中。
Structure in the planet distribution provides an insight into the processes that shape the formation and evolution of planets. The Kepler mission has led to an abundance of statistical discoveries in regards to planetary radius, but the number of observed planets with measured masses is much smaller. By incorporating results from recent mass determination programs, we have discovered a new gap emerging in the planet population for sub-Neptune-mass planets with orbital periods less than 20 days. The gap follows a slope of decreasing mass with increasing orbital period, has a width of a few M⊕, and is potentially completely devoid of planets. Fitting Gaussian mixture models to the planet population in this region favors a bimodel distribution over a unimodel one with a reduction in Bayesian information criterion of 19.9, highlighting the gap significance. We discuss several processes that could generate such a feature in the planet distribution, including a pileup of planets above the gap region, tidal interactions with the host star, dynamical interactions with the disk, with other planets, or with accreting material during the formation process.