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arXiv 1206.3529astro-ph.EP
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恒星双星中热爆星的形成

On the Formation of Hot Jupiters in Stellar Binaries

Smadar Naoz, Will M. Farr, Frederic A. Rasio

摘要:

我们研究了恒星双星中的热闪烁星(HJ)的产生。我们表明,“偏心Kozai-Lidov”(EKL)机制可以发挥关键作用的恒星-行星-恒星三重系统的动力学演化。我们运行了一个大的蒙特卡罗模拟,包括长期的轨道演变,广义相对论进动,潮汐,我们确定的半长轴,偏心率,倾角和自旋轨道角分布的HJs的生产。我们探讨了不同的潮汐摩擦参数对结果的影响。我们发现,考虑到EKL机制时,形成HJs的效率比以前估计的要高。考虑到恒星联星的频率,我们发现这种产生机制可以占观测到的HJ种群的30%左右。目前对自旋轨道角的观测结果与产生\sim的所有HJ的30%和高达100%的未对准系统的机制一致。基于我们的模拟中没有HJ的双星的性质,我们预测存在许多具有适度偏心和倾斜轨道以及几个AU的半长轴的类地行星。

英文摘要:

We study the production of Hot Jupiters (HJs) in stellar binaries. We show that the "eccentric Kozai-Lidov" (EKL) mechanism can play a key role in the dynamical evolution of a star-planet-star triple system. We run a large set of Monte Carlo simulations including the secular evolution of the orbits, general relativistic precession, and tides, and we determine the semi-major axis, eccentricity, inclination and spin-orbit angle distributions of the HJs that are produced. We explore the effect of different tidal friction parameters on the results. We find that the efficiency of forming HJs when taking the EKL mechanism into account is higher then previously estimated. Accounting for the frequency of stellar binaries, we find that this production mechanism can account for about 30% of the observed HJ population. Current observations of spin-orbit angles are consistent with this mechanism producing \sim 30% of all HJs, and up to 100% of the misaligned systems. Based on the properties of binaries without a HJ in our simulations, we predict the existence of many Jupiter-like planets with moderately eccentric and inclined orbits and semi-major axes of several AU.

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