Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 472, Issue 1, Pages L25-L29Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnrasl/slx130
Keywords
binaries: close; stars: evolution; stars: individual: KIC 8164262; stars: kinematics and dynamics; stars: oscillations; stars: rotation
Categories
Funding
- NSF [AST-1205732]
- Lee DuBridge Fellowship at Caltech
- NASA ADAP grant [16-ADAP16-0201]
- National Science Foundation [NSF PHY11-25915]
- NASA [11-KEPLER11-0056]
- Gordon and Betty Moore Foundation [GBMF5076]
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Tidal dissipation in binary star and planetary systems is poorly understood. Fortunately, eccentric binaries known as heartbeat stars often exhibit tidally excited oscillations, providing observable diagnostics of tidal circularization mechanisms and time-scales. We apply tidal theories to observations of the heartbeat star KIC 8164262, which contains an F-type primary in a very eccentric orbit that exhibits a prominent tidally excited oscillation. We demonstrate that the prominent oscillation is unlikely to result from a chance resonance between tidal forcing and a stellar oscillation mode. However, the oscillation has a frequency and amplitude consistent with the prediction of resonance locking, a mechanism in which coupled stellar and orbital evolution maintain a stable resonance between tidal forcing and a stellar oscillation mode. The resonantly excited mode produces efficient tidal dissipation (corresponding to an effective tidal quality factor Q similar to 5x10(4)), such that tidal orbital decay/circularization proceeds on a stellar evolution time-scale.
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