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arXiv 0712.2500astro-ph
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凌日巨系外行星的组成

The composition of transiting giant extrasolar planets

Tristan Guillot

摘要:

原则上,对巨大系外行星的质量和半径的综合测量允许人们确定行星中氢和氦以及重元素的相对比例。然而,基础物理学的不确定性意味着一些已知的凌日行星看起来非常大,这通常会阻止任何确定的结论,当一颗行星被认为是在个体的基础上。根据当时已知的9颗凌日行星的样本,Guillot et al. A&A 453,L21(1996)得出结论,所有行星都可以用相同的假设来解释,要么是对状态方程、不透明度进行大而合理的修改,要么是增加一个能源,可能与潮汐耗散动能有关。在此基础上,他们得出结论,近距离巨行星中重元素的数量与母恒星的金属丰度相关。此外,他们还表明,富含金属的恒星周围的行星可能拥有大量的重元素,高达100个地球质量。这些结果通过研究目前18颗质量介于土星和木星质量两倍之间的凌日行星样本得到证实。

英文摘要:

In principle, the combined measurements of the mass and radius a giant exoplanet allow one to determine the relative fraction of hydrogen and helium and of heavy elements in the planet. However, uncertainties on the underlying physics imply that some known transiting planets appear anomalously large, and this generally prevent any firm conclusion when a planet is considered on an individual basis. On the basis of a sample of 9 transiting planets known at the time, Guillot et al. A&A 453, L21 (1996), concluded that all planets could be explained with the same set of hypotheses, either by large but plausible modifications of the equations of state, opacities, or by the addition of an energy source, probably related to the dissipation of kinetic energy by tides. On this basis, they concluded that the amount of heavy elements in close-in giant planets is correlated with the metallicity of the parent star. Furthermore they showed that planets around metal-rich stars can possess large amounts of heavy elements, up to 100 Earth masses. These results are confirmed by studying the present sample of 18 transiting planets with masses between that of Saturn and twice the mass of Jupiter.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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