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Detailed Characterization of Heartbeat Stars and Their Tidally Excited Oscillations

Cheng, Shelley J. and Fuller, Jim and Guo, Zhao and Lehman, Holger and Hambleton, Kelly (2020) Detailed Characterization of Heartbeat Stars and Their Tidally Excited Oscillations. Astrophysical Journal, 903 (2). Art. No. 122. ISSN 1538-4357. https://resolver.caltech.edu/CaltechAUTHORS:20200916-113003457

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Abstract

Heartbeat stars are a class of eccentric binary stars with short-period orbits and characteristic "heartbeat" signals in their light curves at periastron, caused primarily by tidal distortion. In many heartbeat stars, tidally excited oscillations can be observed throughout the orbit, with frequencies at exact integer multiples of the orbital frequency. Here, we characterize the tidally excited oscillations in the heartbeat stars KIC 6117415, KIC 11494130, and KIC 5790807. Using Kepler light curves and radial-velocity measurements, we first model the heartbeat stars using the binary modeling software ELLC, including gravity darkening, limb darkening, Doppler boosting, and reflection. We then conduct a frequency analysis to determine the amplitudes and frequencies of the tidally excited oscillations. Finally, we apply tidal theories to stellar structure models of each system to determine whether chance resonances can be responsible for the observed tidally excited oscillations, or whether a resonance-locking process is at work. We find that resonance locking is likely occurring in KIC 11494130, but not in KIC 6117415 or KIC 5790807.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.3847/1538-4357/abb46dDOIArticle
https://arxiv.org/abs/2009.01851arXivDiscussion Paper
ORCID:
AuthorORCID
Cheng, Shelley J.0000-0002-5462-0294
Fuller, Jim0000-0002-4544-0750
Guo, Zhao0000-0002-0951-2171
Hambleton, Kelly0000-0001-5473-856X
Additional Information:© 2020 The American Astronomical Society. Received 2020 July 8; revised 2020 August 26; accepted 2020 August 31; published 2020 November 9. S.J.C. would like to thank Susan Mullally for aiding in light-curve processing, as well as Kevin Burdge and Erik Petigura for assistance with light-curve modeling. This research is funded in part by a Heising-Simons Foundation 2018 Scialog grant (#2018-1036), an Innovator Grant from The Rose Hills Foundation, and the Sloan Foundation through grant FG-2018-10515. K.H. and J.F. acknowledge support through a NASA ADAP grant (NNX17AF02G). The authors wish to recognize and acknowledge the very significant cultural role and reverence that the summit of Maunakea has always had within the indigenous Hawaiian community. We are most fortunate to have the opportunity to conduct observations from this mountain.
Group:Astronomy Department, TAPIR, Walter Burke Institute for Theoretical Physics
Funders:
Funding AgencyGrant Number
Heising-Simons Foundation2018-1036
Rose Hills FoundationUNSPECIFIED
Alfred P. Sloan FoundationFG-2018-10515
NASANNX17AF02G
Subject Keywords:Stellar oscillations ; Asteroseismology ; Close binary stars ; Stellar evolutionary models ; Time series analysis
Issue or Number:2
Classification Code:Unified Astronomy Thesaurus concepts: Stellar oscillations (1617); Asteroseismology (73); Close binary stars (254); Stellar evolutionary models (2046); Time series analysis (1916)
Record Number:CaltechAUTHORS:20200916-113003457
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20200916-113003457
Official Citation:Shelley J. Cheng et al 2020 ApJ 903 122
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:105432
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:16 Sep 2020 20:43
Last Modified:09 Nov 2020 21:21

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