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Inverse tides in pulsating binary stars

Fuller, Jim (2021) Inverse tides in pulsating binary stars. Monthly Notices of the Royal Astronomical Society, 501 (1). pp. 483-490. ISSN 0035-8711. doi:10.1093/mnras/staa3636.

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In close binary stars, the tidal excitation of pulsations typically dissipates energy, causing the system to evolve towards a circular orbit with aligned and synchronized stellar spins. However, for stars with self-excited pulsations, we demonstrate that tidal interaction with unstable pulsation modes can transfer energy in the opposite direction, forcing the spins of the stars away from synchronicity, and potentially pumping the eccentricity and spin–orbit misalignment angle. This ‘inverse’ tidal process only occurs when the tidally forced mode amplitude is comparable to the mode’s saturation amplitude, and it is thus most likely to occur in main-sequence gravity mode pulsators with orbital periods of a few days. We examine the long-term evolution of inverse tidal action, finding the stellar rotation rate can potentially be driven to a very large or very small value, while maintaining a large spin–orbit misalignment angle. Several recent asteroseismic analyses of pulsating stars in close binaries have revealed extremely slow core rotation periods, which we attribute to the action of inverse tides.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Fuller, Jim0000-0002-4544-0750
Additional Information:© 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2020 November 12. Received 2020 October 21; in original form 2020 August 24. Published: 21 November 2020. I thank the anonymous referee for a very careful reading and thoughtful report. I am thankful for support through an Innovator Grant from The Rose Hills Foundation, and the Sloan Foundation through grant FG-2018-10515. Data Availability: Data and source code are available upon request to the authors.
Group:TAPIR, Astronomy Department
Funding AgencyGrant Number
Rose Hills FoundationUNSPECIFIED
Alfred P. Sloan FoundationFG-2018-10515
Subject Keywords:binaries: close – stars: evolution – stars: individual: HD 201433 – stars: oscillations – stars: rotation – stars: variables: general
Issue or Number:1
Record Number:CaltechAUTHORS:20201209-113410261
Persistent URL:
Official Citation:Jim Fuller, Inverse Tides in Pulsating Binary Stars, Monthly Notices of the Royal Astronomical Society, staa3636,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:106978
Deposited By: George Porter
Deposited On:09 Dec 2020 21:05
Last Modified:11 Jan 2022 22:43

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