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arXiv 1006.4161astro-ph.EP
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具有热中子星的热恒星具有高倾角

Hot Stars with Hot Jupiters Have High Obliquities

Joshua N. Winn, Daniel Fabrycky, Simon Albrecht, John Asher Johnson

摘要:

我们表明,恒星的行星凌日的恒星的恒星质量大,优先热(T_eff > 6250 K)。这可以解释为什么在最早的测量中观察到小的不稳定性,这些测量集中在从多普勒测量中得出的相对较冷的恒星上,而不是后来从凌日测量中出现的较热的恒星。观察到的趋势可能是由于不同质量的恒星周围的行星形成和迁移的差异。或者,我们推测热木星系统开始时有很大的曲率,但是冷恒星的光球由于对流区的潮汐耗散而与轨道重新对准,而热恒星由于对流区较薄而无法重新对准。这反过来又表明,热彗星起源于少体引力动力学,而磁盘迁移最多起辅助作用。

英文摘要:

We show that stars with transiting planets for which the stellar obliquity is large are preferentially hot (T_eff > 6250 K). This could explain why small obliquities were observed in the earliest measurements, which focused on relatively cool stars drawn from Doppler surveys, as opposed to hotter stars that emerged later from transit surveys. The observed trend could be due to differences in planet formation and migration around stars of varying mass. Alternatively, we speculate that hot-Jupiter systems begin with a wide range of obliquities, but the photospheres of cool stars realign with the orbits due to tidal dissipation in their convective zones, while hot stars cannot realign because of their thinner convective zones. This in turn would suggest that hot Jupiters originate from few-body gravitational dynamics, and that disk migration plays at most a supporting role.

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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