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arXiv 1705.04460astro-ph.EP
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具有大TTV的近距离行星的自旋动力学

Spin dynamics of close-in planets exhibiting large TTVs

J. -B. Delisle, A. C. M. Correia, A. Leleu, P. Robutel

摘要:

我们研究了致密多行星系中近距离行星的自旋演化。由于潮汐耗散,这些行星的自转周期通常被认为与轨道周期同步。在这里,我们表明,行星-行星扰动可以驱动这些行星的自旋进入非同步甚至混沌状态。特别是,我们表明,过境时间变化(TTV)是一个很好的探针,研究自旋动力学,因为两者都是由行星的平均经度的扰动为主。我们将我们的模型应用于KOI-227 b和Kepler-88 b,它们都被观察到经历了强TTV。我们还对这两颗行星的自旋演化进行了数值模拟。我们发现,对于KOI-227 b的非同步旋转是可能的,而开普勒-88 b的旋转可以是混沌的。

英文摘要:

We study the spin evolution of close-in planets in compact multi-planetary systems. The rotation period of these planets is often assumed to be synchronous with the orbital period due to tidal dissipation. Here we show that planet-planet perturbations can drive the spin of these planets into non-synchronous or even chaotic states. In particular, we show that the transit timing variation (TTV) is a very good probe to study the spin dynamics, since both are dominated by the perturbations of the mean longitude of the planet. We apply our model to KOI-227b and Kepler-88b, which are both observed undergoing strong TTVs. We also perform numerical simulations of the spin evolution of these two planets. We show that for KOI-227b non-synchronous rotation is possible, while for Kepler-88b the rotation can be chaotic.

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