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arXiv 1406.4544astro-ph.EP
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地球大小的系外行星的自旋演化,包括大气潮汐和核幔摩擦

Spin evolution of Earth-sized exoplanets, including atmospheric tides and core-mantle friction

Diana Cunha, Alexandre C. M. Correia, Jacques Laskar

摘要:

质量在0.1 - 10 M地球之间的行星被认为拥有稠密的大气层。这些大气层在行星的自转演化中扮演着重要的角色,因为由主星驱动的热大气潮汐可能会抵消引力潮汐。在这项工作中,我们研究了地球大小的系外行星的长期自旋演化。我们推广了以前的工作,包括偏心轨道和双折射的影响。我们发现,在潮汐和核幔摩擦的影响下,行星的倾斜度演化为0或180度。这些行星的自转也会演化成数量非常有限的平衡构型。一般来说,这些平衡都与轨道平均运动不同步。热大气潮汐的作用对于地球大小的行星在其系统的宜居带中变得更加重要,因此当我们寻找其潜在的可居住性时,它们不能被忽视。

英文摘要:

Planets with masses between 0.1 - 10 M_earth are believed to host dense atmospheres. These atmospheres can play an important role on the planet's spin evolution, since thermal atmospheric tides, driven by the host star, may counterbalance gravitational tides. In this work we study the long-term spin evolution of Earth-sized exoplanets. We generalize previous works by including the effect of eccentric orbits and obliquity. We show that under the effect of tides and core-mantle friction, the obliquity of the planets evolve either to 0 or 180 degrees. The rotation of these planets is also expected to evolve into a very restricted number of equilibrium configurations. In general, none of this equilibria is synchronous with the orbital mean motion. The role of thermal atmospheric tides becomes more important for Earth-sized planets in the habitable zones of their systems, so they cannot be neglected when we search for their potential habitability.

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