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arXiv 1012.1876astro-ph.SRastro-ph.EP
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系外行星的命运和红巨星快速旋转器的联系

The Fate of Exoplanets and the Red Giant Rapid Rotator Connection

Joleen K. Carlberg, Steven R. Majewski, Phil Arras, Verne V. Smith, Katia Cunha, Dmitry Bizyaev

备注：
8 pages, 2 figures, Part of PlanetsbeyondMS/2010 proceedings http://arxiv.org/html/1011.6606v1
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摘要：

我们计算了主序星周围的系外行星同伴的命运，以探索红巨星分支演化过程中其宿主恒星摄入行星的频率。利用已发表的系外行星系统的性质，结合恒星演化模型和Zahn的潮汐摩擦理论，我们模拟了行星轨道随着其宿主恒星的演化而发生的潮汐衰减。大多数目前在其恒星2天文单位内运行的行星预计将在其恒星的红巨星分支上升结束时被吞噬。我们的模型证实，许多凌日行星足够接近它们的母恒星，它们将在恒星的主序星寿命期间被吸积。我们还发现，行星吸积可能在解释神秘的红巨星快速旋转体中发挥重要作用，尽管合适的行星系统似乎不足以解释所有这样的快速旋转体。我们将我们的模型快速旋转和幸存的行星系统与现实生活中的对应系统进行比较，并讨论这项工作对更广泛的系外行星领域的影响。

英文摘要：

We have computed the fate of exoplanet companions around main sequence stars to explore the frequency of planet ingestion by their host stars during the red giant branch evolution. Using published properties of exoplanetary systems combined with stellar evolution models and Zahn's theory of tidal friction, we modeled the tidal decay of the planets' orbits as their host stars evolve. Most planets currently orbiting within 2 AU of their star are expected to be ingested by the end of their stars' red giant branch ascent. Our models confirm that many transiting planets are sufficiently close to their parent star that they will be accreted during the main sequence lifetime of the star. We also find that planet accretion may play an important role in explaining the mysterious red giant rapid rotators, although appropriate planetary systems do not seem to be plentiful enough to account for all such rapid rotators. We compare our modeled rapid rotators and surviving planetary systems to their real-life counterparts and discuss the implications of this work to the broader field of exoplanets.

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