Accelerated tidal circularization via resonance locking in KIC 8164262

被引：27
作者：
Fuller, Jim [1 ,2 ]
Hambleton, Kelly [3 ]
Shporer, Avi [4 ]
Isaacson, Howard [5 ]
Thompson, Susan [6 ]
机构：
[1] Univ Calif Santa Barbara, Kavli Inst Theoret Phys, Kohn Hall, Santa Barbara, CA 93106 USA
[2] CALTECH, TAPIR, Walter Burke Inst Theoret Phys, Pasadena, CA 91125 USA
[3] Villanova Univ, Dept Astrophys & Planetary Sci, 800 East Lancaster Ave, Villanova, PA 19085 USA
[4] CALTECH, Div Geol & Planetary Sci, Pasadena, CA 91125 USA
[5] Univ Calif Berkeley, Dept Astron, 601 Campbell Hall, Berkeley, CA 94720 USA
[6] NASA, SETI Inst, Ames Res Ctr, Moffett Field, CA 94035 USA
来源：
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2017年 / 472卷 / 01期
基金：
美国国家科学基金会;
关键词：
binaries: close; stars: evolution; stars: individual: KIC 8164262; stars: kinematics and dynamics; stars: oscillations; stars: rotation; KEPLER ECLIPSING BINARY; STELLAR PULSATIONS; ECCENTRIC ORBITS; SYSTEMS; KOI-54; COMPONENT; EVOLUTION; MODES;
D O I：
10.1093/mnrasl/slx130
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
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.
引用
收藏
页码：L25 / L29
页数：5
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