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arXiv 2104.01004astro-ph.EPastro-ph.SR
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近距离行星的磁性和潮汐迁移。长期进化对它们种群的影响

Magnetic and tidal migration of close-in planets. Influence of secular evolution on their population

Jérémy Ahuir, Antoine Strugarek, Allan-Sacha Brun, Stéphane Mathis

摘要:

在过去的二十年里,在各种各样的宿主恒星周围发现了大量的近距离行星。这些系外行星很可能通过磁场和潮汐相互作用进行行星迁移。我们的目标是通过同时考虑潮汐和磁矩,沿着其宿主恒星的结构和旋转演化来跟踪行星的轨道演化,以解释观测到的近距离行星分布的一些特性。我们依赖于一个共面圆形恒星行星系统的数值模型,考虑到恒星结构的变化,风制动和恒星行星的相互作用,称为ESPEM。我们浏览恒星行星系统的配置参数空间,并评估长期演化的相对影响的磁场和潮汐力矩。然后,我们综合恒星行星人口和面对他们的分布在轨道和恒星旋转周期开普勒卫星数据。首先,我们发现,在原行星盘消散后,这两种类型的相互作用可以主导长期的演化取决于系统的初始配置和考虑的演化阶段。此外,根据行星显著迁移的演化阶段,恒星-行星系统的不同种群来自两种相互作用的联合作用。这可能会显著影响恒星-行星系统的可探测性,以及陀螺学的有效性。总的来说,恒星-行星相互作用显著影响了主序星轨道周期的全球分布,而恒星自转周期的全球分布受到的影响很小。更确切地说,恒星-行星的磁相互作用显著影响了缓慢旋转恒星周围超级地球的分布,而潮汐效应则被发现塑造了巨行星的分布。

英文摘要:

Over the last two decades, a large population of close-in planets has been detected around a wide variety of host stars. Such exoplanets are likely to undergo planetary migration through magnetic and tidal interactions. We aim to follow the orbital evolution of a planet along the structural and rotational evolution of its host star by taking into account simultaneously tidal and magnetic torques, in order to explain some properties of the distribution of observed close-in planets. We rely on a numerical model of a coplanar circular star-planet system taking into account stellar structural changes, wind braking and star-planet interactions, called ESPEM. We browse the parameter space of star-planet systems' configurations and assess the relative influence of magnetic and tidal torques on secular evolution. We then synthesize star-planet populations and confront their distribution in orbital and stellar rotation periods to Kepler satellite data. First, we find that after the dissipation of the protoplanetary disk, both types of interactions can dominate secular evolution depending on the initial configuration of the system and the evolutionary phase considered. Moreover, different populations of star-planet systems emerge from the combined action of both kinds of interactions, according to the evolutionary phase during which the planet migrates significantly. This may affect significantly the detectability of star-planet systems as well as the validity of gyrochonology. All in all, star-planet interactions significantly impact the global distribution in orbital periods during the main sequence, while the global distribution in stellar rotation periods is marginally affected. More precisely, star-planet magnetic interactions significantly affect the distribution of super-Earths around slowly rotating stars, while tidal effects are found to shape the distribution of giant planets.

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