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arXiv:2404.04047 (astro-ph)
[Submitted on 5 Apr 2024 (v1), last revised 24 Apr 2024 (this version, v2)]

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

Authors:Nikoleta Ilić, Katja Poppenhaeger, Anna Barbara Queiroz, Cristina Chiappini
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Abstract: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 $Q'_* \leq 2.33 \times 10^7$.
Comments: Accepted for publication in Astronomische Nachrichten (AN); reference list corrected
Subjects: Solar and Stellar Astrophysics (astro-ph.SR); Earth and Planetary Astrophysics (astro-ph.EP); Instrumentation and Methods for Astrophysics (astro-ph.IM)
Cite as: arXiv:2404.04047 [astro-ph.SR]
  (or arXiv:2404.04047v2 [astro-ph.SR] for this version)
  https://doi.org/10.48550/arXiv.2404.04047

Submission history

From: Nikoleta Ilić [view email]
[v1] Fri, 5 Apr 2024 11:59:52 UTC (257 KB)
[v2] Wed, 24 Apr 2024 15:31:29 UTC (244 KB)
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