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arXiv 0804.0406astro-ph
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低质量太阳系外行星中冰的组成

Composition of Ices in Low-Mass Extrasolar Planets

Ulysse Marboeuf, Olivier Mousis, David Ehrenreich, Yann Alibert, Arnaud Cassan, Valentine Wakelam, Jean-Philippe Beaulieu

摘要:

我们研究了原行星盘中冰质星子的形成条件,以确定小而冷的太阳系外行星中冰的组成。假设冰是由水合物,笼形物,和纯冷凝物形成的,我们计算它们的质量分数相对于包含在星子中的冰的总量,为一个网格的磁盘模型。我们发现,冰的组成弱依赖于所采用的磁盘热力学条件,而气相的初始组成的影响。使用一个合理的范围内的分子丰度比和变化的相对元素碳在气相中的氧比的原行星盘,使我们能够将我们的模型应用到广泛的行星系统。因此,我们的研究结果可以用来限制冷行星的冰/挥发性相组成证明微透镜调查,假设的海洋行星和碳行星,这可能是由科罗或开普勒探测。

英文摘要:

We study the formation conditions of icy planetesimals in protoplanetary disks in order to determine the composition of ices in small and cold extrasolar planets. Assuming that ices are formed from hydrates, clathrates, and pure condensates, we calculate their mass fractions with respect to the total quantity of ices included in planetesimals, for a grid of disk models. We find that the composition of ices weakly depends on the adopted disk thermodynamic conditions, and is rather influenced by the initial composition of the gas phase. The use of a plausible range of molecular abundance ratios and the variation of the relative elemental carbon over oxygen ratio in the gas phase of protoplanetary disks, allow us to apply our model to a wide range of planetary systems. Our results can thus be used to constrain the icy/volatile phase composition of cold planets evidenced by microlensing surveys, hypothetical ocean-planets and carbon planets, which could be detected by Corot or Kepler.

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