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arXiv 2404.04047astro-ph.SRastro-ph.EPastro-ph.IM
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从行星引发的恒星自转加速约束恒星潮汐品质因子

Constraining stellar tidal quality factors from planet-induced stellar spin-up

Nikoleta Ilić, Katja Poppenhaeger, Anna Barbara Queiroz, Cristina Chiappini

AI总结:

针对紧密恒星-行星系统,提出一种通过同龄伴星磁活动差异估算行星引发的恒星自转变化,从而约束恒星修正潮汐品质因子 $Q'_*$ 的方法,并在 HD189733 系统中得出 $Q'_* \leq 2.33 \times 10^7$ 的约束。

摘要:

如最近所示,紧密恒星-行星系统的动力学演化受恒星与行星间潮汐相互作用的影响。此类系统中自转与轨道的演化速率取决于恒星和行星的潮汐耗散效率。在此,我们提出一种方法,用于约束拥有行星的恒星的修正潮汐品质因子 $Q'_*$,该恒星的自转演化因角动量从行星轨道运动转移到恒星对流区自转而被其行星改变。这种改变的自转是通过观测拥有行星的恒星与其同龄伴星在磁活动上的差异来估算的,即该方法适用于具有宽距伴星的恒星-行星系统。我们以拥有行星的宽距双星系统 HD189733 为例,发现该行星宿主恒星的修正潮汐品质因子被约束为 $Q'_* \leq 2.33 \times 10^7$。

英文摘要:

The dynamical evolution of tight star-planet systems is influenced by tidal interactions between the star and the planet, as was shown recently. The rate at which spins and orbits in such a system evolve depends on the stellar and planetary tidal dissipation efficiency. Here, we present a method to constrain the modified tidal quality factor $Q'_*$ of a planet-hosting star whose rotational evolution has been altered by its planet through angular momentum transfer from the planetary orbital motion to the rotation of the stellar convective zone. The altered rotation is estimated from an observed discrepancy of magnetic activity of the planet-hosting star and a coeval companion star, i.e. this method is applicable to star-planet systems with wide stellar companions. We give an example of the planet-hosting wide binary system HD189733 and find that the planet host's modified tidal quality factor is constrained to be $Q'_* \leq 2.33 \times 10^7$.

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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