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arXiv 2201.11768astro-ph.EP
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从恒星倾角分布看热彗星的起源

Origins of Hot Jupiters from the Stellar Obliquity Distribution

Malena Rice, Songhu Wang, Gregory Laughlin

摘要:

恒星的旋转度,或者说它的自转轴和它的伴星的平均轨道法线之间的夹角,对这个系统的演化历史提供了一个独特的限制。不像太阳系,太阳的赤道几乎与它的伴星对齐,许多热木星系统被发现有很大的自旋轨道错位,在极地或逆行轨道上有行星。我们证明,在相反的恒星窝藏热的恒星在圆形轨道上,那些偏心同伴遵循没有人口范围的恒星温度的趋势。这一发现可以通过高偏心率迁移和潮汐阻尼的组合来自然地解释。此外,我们表明,今天观察到的联合结晶度和偏心率分布与高偏心率迁移的结果是一致的,没有严格的要求调用其他热木星形成机制的磁盘迁移或原位形成。在整个种群的水平上,高离心率的迁移可以始终如一地塑造热木星系统的动力学演化。

英文摘要:

The obliquity of a star, or the angle between its spin axis and the average orbit normal of its companion planets, provides a unique constraint on that system's evolutionary history. Unlike the Solar System, where the Sun's equator is nearly aligned with its companion planets, many hot Jupiter systems have been discovered with large spin-orbit misalignments, hosting planets on polar or retrograde orbits. We demonstrate that, in contrast to stars harboring hot Jupiters on circular orbits, those with eccentric companions follow no population-wide obliquity trend with stellar temperature. This finding can be naturally explained through a combination of high-eccentricity migration and tidal damping. Furthermore, we show that the joint obliquity and eccentricity distributions observed today are consistent with the outcomes of high-eccentricity migration, with no strict requirement to invoke the other hot Jupiter formation mechanisms of disk migration or in-situ formation. At a population-wide level, high-eccentricity migration can consistently shape the dynamical evolution of hot Jupiter systems.

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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