KIC 8164262: a heartbeat star showing tidally induced pulsations with resonant locking

Hambleton, K., Fuller, J., Thompson, S., Prša, A., Kurtz, Donald Wayne orcid iconORCID: 0000-0002-1015-3268, Shporer, A., Isaacson, H., Howard, A. W., Endl, M. et al (2018) KIC 8164262: a heartbeat star showing tidally induced pulsations with resonant locking. Monthly Notices of the Royal Astronomical Society, 473 (4). pp. 5165-5176. ISSN 0035-8711

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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.

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