Tidally Induced Pulsations in Kepler Eclipsing Binary KIC 3230227

Abstract

KIC 3230227 is a short period ($P\approx 7.0$ days) eclipsing binary with a very eccentric orbit ($e=0.6$). From combined analysis of radial velocities and {\it Kepler} light curves, this system is found to be composed of two A-type stars, with masses of $M_1=1.84\pm 0.18M_{\odot }$, $M_2=1.73\pm 0.17M_{\odot }$ and radii of $R_1=2.01\pm 0.09R_{\odot }$, $R_2=1.68\pm 0.08R_{\odot }$ for the primary and secondary, respectively. In addition to an eclipse, the binary light curve shows a brightening and dimming near periastron, making this a somewhat rare eclipsing heartbeat star system. After removing the binary light curve model, more than ten pulsational frequencies are present in the Fourier spectrum of the residuals, and most of them are integer multiples of the orbital frequency. These pulsations are tidally driven, and both the amplitudes and phases are in agreement with predictions from linear tidal theory for $l=2,m=-2$ prograde modes.

ApJ accepted

References in corpus (4)

• Modules for Experiments in Stellar Astrophysics (MESA)
• A heuristic derivation of the uncertainty of the frequency determination in time series data
• Spectroscopic survey of Kepler stars. I. HERMES/Mercator observations of A- and F-type stars
• KIC 3749404: A heartbeat Star with Rapid Apsidal Advance Indicative of a Tertiary Component

Cited by in corpus (6)

• The Most Massive Heartbeat: An In-depth Analysis of ι Orionis
• KIC 8262223: A Post-Mass Transfer Eclipsing Binary Consisting of a Delta Scuti Pulsator and a Helium White Dwarf Precursor
• Accelerated Tidal Circularization Via Resonance Locking in KIC 8164262
• $\epsilon$ Lupi: measuring the heartbeat of a doubly-magnetic massive binary with BRITE-Constellation
• BRITE-Constellation reveals evidence for pulsations in the enigmatic binary $\eta$ Carinae
• KOI-3890: A high mass-ratio asteroseismic red-giant$+$M-dwarf eclipsing binary undergoing heartbeat tidal interactions