KIC 8164262: a heartbeat star showing tidally induced pulsations with resonant locking
Article
Article Title | KIC 8164262: a heartbeat star showing tidally induced pulsations with resonant locking |
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ERA Journal ID | 1074 |
Article Category | Article |
Authors | Hambleton, K. (Author), Fuller, J. (Author), Thompson, S. (Author), Prsa, A. (Author), Kurtz, D. W. (Author), Shporer, A. (Author), Isaacson, H. (Author), Howard, A. W. (Author), Endl, M. (Author), Cochran, W. (Author) and Murphy, S. J. (Author) |
Journal Title | Monthly Notices of the Royal Astronomical Society |
Journal Citation | 473 (4), pp. 5165-5176 |
Number of Pages | 12 |
Year | 2017 |
Publisher | Oxford University Press |
Place of Publication | United Kingdom |
ISSN | 0035-8711 |
1365-2966 | |
Digital Object Identifier (DOI) | https://doi.org/10.1093/mnras/stx2673 |
Web Address (URL) | https://academic.oup.com/mnras/article/473/4/5165/4553530 |
Abstract | We present the analysis of KIC 8164262, a heartbeat star with a high-amplitude (∼1 mmag), tidally resonant pulsation (a mode in resonance with the orbit) at 229 times the orbital frequency and a plethora of tidally induced g-mode pulsations (modes excited by the orbit). The analysis combines Kepler light curves with follow-up spectroscopic data from the Keck telescope, KPNO (Kitt Peak National Observatory) 4-m Mayall telescope and the 2.7-m telescope at the McDonald observatory. We apply the binary modelling software, PHOEBE, to the Kepler light curve and radial velocity data to determine a detailed binary star model that includes the prominent pulsation and Doppler boosting, alongside the usual attributes of a binary star model (including tidal distortion and reflection). The results show that the system contains a slightly evolved F star with an M secondary companion in a highly eccentric orbit (e = 0.886). We use the results of the binary star model in a companion paper (Fuller) where we show that the prominent pulsation can be explained by a tidally excited oscillation mode held near resonance by a resonance locking mechanism. |
Keywords | Asteroseismology; Binaries: close; Binaries: general; Stars: individual (KIC 8164262); Stars: oscillations; Stars: variables: general; Astrophysics - Solar and Stellar Astrophysics |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Public Notes | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2017 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
Byline Affiliations | Villanova University, United States |
California Institute of Technology (Caltech), United States | |
NASA Ames Research Center, United States | |
University of Central Lancashire, United Kingdom | |
University of California, United States | |
University of Texas at Austin, United States | |
University of Sydney | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q7381/kic-8164262-a-heartbeat-star-showing-tidally-induced-pulsations-with-resonant-locking
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