论文标题
心跳星及其潮气振荡的详细表征
Detailed Characterization of Heartbeat Stars and their Tidally Excited Oscillations
论文作者
论文摘要
心跳恒星是一类偏心的二进制恒星，其在Periastron的光曲线中具有短周期轨道和特征性的“心跳”信号，主要是由潮汐变形引起的。在许多心跳恒星中，可以在整个轨道上观察到潮气激发的振荡，并在轨道频率的精确整数倍数下进行频率。 Here, we characterize the tidally excited oscillations in the heartbeat stars KIC 6117415, KIC 11494130, and KIC 5790807. Using Kepler light curves and radial velocity measurements, we first model the heartbeat stars using the binary modeling software ELLC, including gravity darkening, limb darkening, Doppler boosting, and reflection.然后，我们进行频率分析以确定潮汐激发振荡的幅度和频率。最后，我们将潮汐理论应用于每个系统的恒星结构模型，以确定机会共振是否可以负责观察到的潮汐振荡，或者是否可以进行共振锁定过程。我们发现在KIC 11494130中可能发生共振锁定，但不存在于KIC 6117415或KIC 5790807中。
Heartbeat stars are a class of eccentric binary stars with short-period orbits and characteristic "heartbeat" signals in their light curves at periastron, caused primarily by tidal distortion. In many heartbeat stars, tidally excited oscillations can be observed throughout the orbit, with frequencies at exact integer multiples of the orbital frequency. Here, we characterize the tidally excited oscillations in the heartbeat stars KIC 6117415, KIC 11494130, and KIC 5790807. Using Kepler light curves and radial velocity measurements, we first model the heartbeat stars using the binary modeling software ELLC, including gravity darkening, limb darkening, Doppler boosting, and reflection. We then conduct a frequency analysis to determine the amplitudes and frequencies of the tidally excited oscillations. Finally, we apply tidal theories to stellar structure models of each system to determine whether chance resonances can be responsible for the observed tidally excited oscillations, or whether a resonance locking process is at work. We find that resonance locking is likely occurring in KIC 11494130, but not in KIC 6117415 or KIC 5790807.
