The Effects of Close-in Exoplanets on Their Host Stars

The Effects of Close-in Exoplanets on Their Host Stars
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DOI：
10.1007/978-3-319-09749-7_9
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发表时间：
2015
期刊：
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影响因子：
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通讯作者：
E. Guenther;S. Geier
E. Guenther;S. Geier
中科院分区：
其他
文献类型：
--
作者：
E. Guenther;S. Geier

文献摘要

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与 RS CVn 恒星类似，由于恒星与行星之间的潮汐和磁相互作用，预计近距离行星可以引发恒星活动。恒星和行星之间的潮汐和/或磁相互作用预计会影响恒星的磁场，从而导致恒星风、日冕、色球层以及恒星表面斑点的结构变化。对这些效应的观察很困难，并且导致了好坏参半的结果，这些结果至少可以部分地用这种现象的瞬态性质来解释。据称，许多拥有近距离行星的恒星都检测到了诱发活动。然而，最极端的天体 WASP-18 却没有表现出任何此类迹象。据称由诱发活动引起的活跃区域并不位于次行星点，而是通常位于其前方。一些研究声称，拥有近距离的大质量系外行星的恒星在统计上更加活跃，但其他研究得出的结论是，这种相关性只是选择偏差的产物。开普勒卫星的研究表明超级耀斑确实存在，但它们似乎并不是由恒星和行星之间的相互作用引起的。虽然仍在讨论是否已检测到行星主序恒星的诱发活动，但当恒星演化为巨星时，行星的吞噬可能会产生戏剧性的后果。
In analogy to the RS CVn stars, it is expected that close-in planets can induce stellar activity due to tidal and magnetic interaction between the star and the planet. The tidal and/or magnetic interaction between the star and the planet is expected to affect the magnetic field of the star which then cause structural changes of the stellar wind, the corona , the chromosphere , and also spots on the stellar surface. Observations of these effects are difficult and have led to mixed results that can at least partly be explained by the transient nature of the phenomena. The detection of induced activity has been claimed for a number of stars hosting close-in planets . However the most extreme object, WASP-18 , does not show any such signs. The active regions, which have been claimed as being caused by induced activity are not located at the sub-planetary point but oftenahead of it. Some studies have claimed that stars with close-in, massive exoplanets are statistically more active, but others conclude that this correlation is just the product of a selection bias. Studies with the Kepler-satellite show that superflares exist, but they do not seem to be caused by the interaction between stars and planets. While it is still discussed whether induced activity has been detected for planet-hosting main-sequence stars, the engulfment of planets when the star evolves to a giant might have dramatic consequences.