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arXiv 1111.5486astro-ph.EP
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利用潮汐效应抽取系外行星的偏心率

Pumping the eccentricity of exoplanets by tidal effect

Alexandre C. M. Correia, Gwenaël Boué, Jacques Laskar

摘要:

接近其主星的行星被认为会经历显著的潮汐相互作用,导致轨道偏心率的渐进阻尼。在这里,我们表明,当行星的轨道是由一个外部的同伴兴奋,潮汐效应与引力相互作用相结合,可能会引起一个长期的偏心率增加漂移。只要这种长期漂移抵消阻尼效应,偏心率就可以增加到很高的值。这一机制可以解释为什么一些适度接近的系外行星被观察到具有相当大的偏心率值。

英文摘要:

Planets close to their host stars are believed to undergo significant tidal interactions, leading to a progressive damping of the orbital eccentricity. Here we show that, when the orbit of the planet is excited by an outer companion, tidal effects combined with gravitational interactions may give rise to a secular increasing drift on the eccentricity. As long as this secular drift counterbalances the damping effect, the eccentricity can increase to high values. This mechanism may explain why some of the moderate close-in exoplanets are observed with substantial eccentricity values.

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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