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arXiv 1606.08623astro-ph.EPastro-ph.IMastro-ph.SR
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潮汐和小质量恒星内行星的angular momentum再分布:第一个动力学模型

Tides and angular momentum redistribution inside low-mass stars hosting planets: a first dynamical model

A. F. Lanza, S. Mathis

摘要:

我们介绍了一个通用的数学框架来模拟内部运输的角动量在一个恒星托管一个接近的行星/恒星伴侣。通过假设潮汐和旋转的扭曲是小的,并且由恒星风和潮汐扭矩引起的角动量的沉积/提取仅通过依赖于径向坐标的有效涡粘性来重新分配,我们可以用完全解析的方式来制定模型。它使我们能够同时计算伴星轨道的演化以及恒星的自旋和径向微分自转。一个说明性的应用程序的情况下,一个F-型主序星托管热木星。我们的模型,以测试更复杂的数值动力学模型和研究的内部旋转配置文件的系外行星主机,提交潮汐和恒星风的综合影响,通过asteroseismology的一般相关性进行了讨论。

英文摘要:

We introduce a general mathematical framework to model the internal transport of angular momentum in a star hosting a close-in planetary/stellar companion. By assuming that the tidal and rotational distortions are small and that the deposit/extraction of angular momentum induced by stellar winds and tidal torques are redistributed solely by an effective eddy-viscosity that depends on the radial coordinate, we can formulate the model in a completely analytic way. It allows us to compute simultaneously the evolution of the orbit of the companion and of the spin and the radial differential rotation of the star. An illustrative application to the case of an F-type main-sequence star hosting a hot Jupiter is presented. The general relevance of our model to test more sophisticated numerical dynamical models and to study the internal rotation profile of exoplanet hosts, submitted to the combined effects of tides and stellar winds, by means of asteroseismology are discussed.

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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