从行星诱发的恒星自旋推测恒星潮汐质量因子

IF 1.1 4区物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS Astronomische Nachrichten Pub Date : 2024-04-30 DOI:10.1002/asna.20230132

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

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摘要

最近的研究表明，紧密恒星-行星系统的动力学演化受到恒星和行星之间潮汐相互作用的影响。这种系统的自旋和轨道演化速度取决于恒星和行星的潮汐耗散效率。在这里，我们提出了一种方法来约束行星寄宿恒星的修正潮汐品质因数，该恒星的旋转演化已被其行星通过从行星轨道运动到恒星对流区旋转的角动量转移所改变。改变的自转是通过观测到的行星寄主恒星和共生伴星的磁活动差异估算出来的，也就是说，这种方法适用于有宽伴星的星-行星系统。我们以行星寄主宽双星系统 HD189733 为例，发现行星寄主的修正潮汐品质因数被约束为 .

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

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, that is, 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 $Q_{*}^{'} \leq 2.33 \times 10^{7}$ .

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来源期刊

Astronomische Nachrichten 地学天文-天文与天体物理

CiteScore

1.80

自引率

11.10%

发文量

审稿时长

4-8 weeks

期刊介绍： Astronomische Nachrichten, founded in 1821 by H. C. Schumacher, is the oldest astronomical journal worldwide still being published. Famous astronomical discoveries and important papers on astronomy and astrophysics published in more than 300 volumes of the journal give an outstanding representation of the progress of astronomical research over the last 180 years. Today, Astronomical Notes/ Astronomische Nachrichten publishes articles in the field of observational and theoretical astrophysics and related topics in solar-system and solar physics. Additional, papers on astronomical instrumentation ground-based and space-based as well as papers about numerical astrophysical techniques and supercomputer modelling are covered. Papers can be completed by short video sequences in the electronic version. Astronomical Notes/ Astronomische Nachrichten also publishes special issues of meeting proceedings.

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