论文标题
一个独特的小行星人群：亚毕业生
A Distinct Population of Small Planets: Sub-Earths
论文作者
论文摘要
众所周知，小行星的尺寸是双模式的，缝隙分离的行星已经失去了原始气氛（超级地球），而那些保留它们的行星（迷你北极线）。在这里，我们报告了另一个不同大小的不同人群的证据。通过集中在16天内的GK紫外线周围绕行的行星上，并纠正观察性完整性，我们发现，超物节峰值的数量约为1.4地球半径，并消失在此尺寸下。取而代之的是，新的行星（亚物石）似乎以低于1的地球半径的尺寸占主导地位，并且发生的大小降低。在超短期的行星中也观察到了这种模式。 超级货币的末尾支持较早的声称，超级矿石和迷你纽扣，可能在气态原始星际磁盘中形成的行星具有狭窄的质量分布。相比之下，亚物质可以用幂律质量分布来描述，可以用陆地行星形成理论来解释。因此，我们推测它们在气体磁盘消散后形成很好。这些亚地亚的延伸到当前不可见的较长轨道时期可能是真正的陆地类似物。这强烈激发了新的搜索。
The sizes of small planets have been known to be bi-modal, with a gap separating planets that have lost their primordial atmospheres (super-Earths), and the ones that retain them (mini-Neptunes). Here, we report evidences for another distinct population at smaller sizes. By focussing on planets orbiting around GK-dwarfs inward of 16 days, and correcting for observational completeness, we find that the number of super-Earths peak around 1.4 Earth radii and disappear shortly below this size. Instead, a new population of planets (sub-Earths) appear to dominate at sizes below ~ 1 Earth radius, with an occurrence that rises with decreasing size. This pattern is also observed in ultra-short-period planets. The end of super-Earths supports earlier claims that super-Earths and mini-Neptunes, planets that likely form in gaseous proto-planetary disks, have a narrow mass distribution. The sub-Earths, in contrast, can be described by a power-law mass distribution and may be explained by the theory of terrestrial planet formation. We therefore speculate that they are formed well after the gaseous disks have dissipated. The extension of these sub-Earths towards longer orbital periods, currently invisible, may be the true terrestrial analogues. This strongly motivates new searches.
