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arXiv 1612.03556astro-ph.EP
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系外行星的密度分类

Classification of exoplanets according to density

Andrzej Odrzywolek, Johann Rafelski

摘要:

考虑到概率分布作为一个函数的平均密度$\barρ$计算424太阳系外行星,我们确定三个对数正态高斯人口组成部分。在$\barρ\simeq0.7$ g/cc和$\barρ\simeq7$ g/cc的两个最多的组成部分分别是冰/气体巨星和铁/岩石超级地球。$\barρ\simeq30$ g/cc的第三种成分与褐矮星一致,即,电子简并支持的对象。我们注意到几个极端密度的行星物体的存在。

英文摘要:

Considering probability distribution as a function of the average density $\barρ$ computed for 424 extrasolar planets we identify three log-normal Gaussian population components. The two most populous components at $\barρ\simeq0.7$ g/cc and $\barρ\simeq7$ g/cc are the ice/gas giants and iron/rock super-Earths, respectively. A third component at $\barρ\simeq30$ g/cc is consistent with brown dwarfs, i.e., electron degeneracy supported objects. We note presence of several extreme density planetary objects.

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