Artigo Acesso aberto Revisado por pares

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

2017; Oxford University Press; Volume: 473; Issue: 4 Linguagem: Inglês

10.1093/mnras/stx2673

ISSN

1365-2966

Autores

K. Hambleton, Jim Fuller, Susan E. Thompson, A. Prša, D. W. Kurtz, Avi Shporer, Howard Isaacson, Andrew W. Howard, Michael Endl, William D. Cochran, Simon J. Murphy,

Tópico(s)

Gamma-ray bursts and supernovae

Resumo

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 Mayal 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 et al., 2017) 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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