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Tidal dissipation in binary star and planetary systems is poorly understood.Fortunately, eccentric binaries known as heartbeat stars often exhibit tidallyexcited oscillations, providing observable diagnostics of tidal circularizationmechanisms and timescales. We apply tidal theories to observations of theheartbeat star KIC 8164262, which contains an F-type primary in a veryeccentric orbit that exhibits a prominent tidally excited oscillation. Wedemonstrate that the prominent oscillation is unlikely to result from a chanceresonance between tidal forcing and a stellar oscillation mode. However, theoscillation has a frequency and amplitude consistent with the prediction ofresonance locking, a mechanism in which coupled stellar and orbital evolutionmaintain a stable resonance between tidal forcing and a stellar oscillationmode. The resonantly excited mode produces efficient tidal dissipation(corresponding to an effective tidal quality factor $Q \sim 5 \times 10^4$),such that tidal orbital decay/circularization proceeds on a stellar evolutiontime scale.

Accelerated Tidal Circularization Via Resonance Locking in KIC 8164262