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Tidally induced oscillations and orbital decay in compact triple-star systems

Fuller, Jim and Derekas, A. and Borkovits, T. and Huber, D. and Bedding, T. R. and Kiss, L. L. (2013) Tidally induced oscillations and orbital decay in compact triple-star systems. Monthly Notices of the Royal Astronomical Society, 429 (3). pp. 2425-2441. ISSN 1365-2966. https://resolver.caltech.edu/CaltechAUTHORS:20190425-152213156

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Abstract

We investigate the nature of tidal effects in compact triple-star systems. The hierarchical structure of a triple system produces tidal forcing at high frequencies unobtainable in binary systems, allowing for the tidal excitation of high-frequency p-modes in the stellar components. The tidal forcing exists even for circular, aligned and synchronized systems. We calculate the magnitude and frequencies of three-body tidal forcing on the central primary star for circular and coplanar orbits, and we estimate the amplitude of the tidally excited oscillation modes. We also calculate the secular orbital changes induced by the tidally excited modes and show that they can cause significant orbital decay. During certain phases of stellar evolution, the tidal dissipation may be greatly enhanced by resonance locking. We then compare our theory to observations of HD 181068, which is a hierarchical triply eclipsing star system in the Kepler field of view. The observed oscillation frequencies in HD 181068 can be naturally explained by three-body tidal effects. We then compare the observed oscillation amplitudes and phases in HD 181068 to our predictions, finding mostly good agreement. Finally, we discuss the past and future evolution of compact triple systems like HD 181068.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1093/mnras/sts511DOIArticle
https://arxiv.org/abs/1211.6814arXivDiscussion Paper
ORCID:
AuthorORCID
Fuller, Jim0000-0002-4544-0750
Derekas, A.0000-0002-6526-9444
Borkovits, T.0000-0002-8806-496X
Huber, D.0000-0001-8832-4488
Bedding, T. R.0000-0001-5222-4661
Additional Information:© 2013 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2012 November 27. Received 2012 October 17. We thank Dong Lai and Dan Tamayo for useful discussions. JF acknowledges the hospitality (autumn 2011) of the Kavli Institute for Theoretical Physics at UCSB (funded by the NSF through Grant 11-Astro11F-0016) where part of the work was carried out. This project has been supported by NSF grants AST-1008245 and AST-1211061, NASA grants NNX12AF85G and NNX10AP19G, the Hungarian OTKA Grants K76816, K83790 and MB08C 81013 and the ‘Lendület-2009’ Young Researchers Programme of the Hungarian Academy of Sciences. Part of the research leading to these results has received funding from the European Research Council under the European Community's Seventh Framework Programme (FP7/2007--2013)/ERC grant agreement no. 227224 (PROSPERITY). AD gratefully acknowledges financial support from the Magyary Zoltán Public Foundation. AD was supported by the Hungarian Eötvös fellowship. AD has been supported by the János Bolyai Research Scholarship of the Hungarian Academy of Sciences. LLK wishes to thank support from the European Community's Seventh Framework Programme (FP7/2007--2013) under grant agreement no. 269194. The Kepler Team and the Kepler Guest Observer Office are recognized for helping to make the mission and these data possible.
Funders:
Funding AgencyGrant Number
NSF11-Astro11F-0016
NSFAST-1008245
NSFAST-1211061
NASANNX12AF85G
NASANNX10AP19G
Hungarian Scientific Research Fund (OTKA)K76816
Hungarian Scientific Research Fund (OTKA)K83790
Hungarian Scientific Research Fund (OTKA)MB08C 81013
Hungarian Academy of SciencesLendület-2009
European Research Council (ERC)227224 (PROSPERITY)
Magyary Zoltán Public FoundationUNSPECIFIED
Eötvös FellowshipUNSPECIFIED
European Research Council (ERC)269194
Subject Keywords:binaries: close, binaries: eclipsing, stars: individual: HD 181068, stars: oscillations
Issue or Number:3
Record Number:CaltechAUTHORS:20190425-152213156
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20190425-152213156
Official Citation:Jim Fuller, A. Derekas, T. Borkovits, D. Huber, T. R. Bedding, L. L. Kiss, Tidally induced oscillations and orbital decay in compact triple-star systems, Monthly Notices of the Royal Astronomical Society, Volume 429, Issue 3, 1 March 2013, Pages 2425–2441, https://doi.org/10.1093/mnras/sts511
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:94992
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:25 Apr 2019 23:01
Last Modified:09 Mar 2020 13:18

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