Min-Yu Li, Sheng-Bang Qian, Ai-Ying Zhou, Li-Ying Zhu, Wen-Ping Liao, Er-Gang Zhao, Xiang-Dong Shi, Fu-Xing Li and Qi-Bin Sun
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引用次数: 0
摘要
具有潮汐激发振荡(TEOs)的心跳星(HBSs)是研究系统内部特性的理想天体物理实验室。本文利用 TESS 的测光数据,发现了五颗表现出 TEO 的新 HBS。这些天体的轨道参数是使用基于马尔可夫链蒙特卡罗方法的库马尔等人模型的修正版得出的。对这些天体中的 TEO 进行了研究,并确定了它们的脉动相位和模式。TIC 266809405、TIC 266894805 和 TIC 412881444 中的近地天体的脉动相位与主要的 l = 2、m = 0 或 ±2 球谐波相一致。至于 TIC 11619404,虽然 TEO 相位接近 m = +2 模式,但由于该系统倾角较低,因此不能排除 m = 0 模式。TIC 447927324中的TEO相位与绝热预期有很大偏差(>2σ),这表明它可能是一个行波,或者脉动是非绝热的。此外,这些近地天体的轨道谐波相对较低,我们谨慎地认为这可能是一种观测偏差。这些天体对于研究偏心轨道双星的结构和演化,以及用 TEOs 来扩展 TESS HBS 星表都是非常有价值的来源。
Five New Heartbeat Star Systems with Tidally Excited Oscillations Discovered Based on TESS Data
Heartbeat stars (HBSs) with tidally excited oscillations (TEOs) are ideal astrophysical laboratories for studying the internal properties of the systems. In this paper, five new HBSs exhibiting TEOs are discovered using TESS photometric data. The orbital parameters are derived using a corrected version of Kumar et al.'s model based on the Markov Chain Monte Carlo method. The TEOs in these objects are examined, and their pulsation phases and modes are identified. The pulsation phases of the TEOs in TIC 266809405, TIC 266894805, and TIC 412881444 are consistent with the dominant l = 2, m = 0, or ±2 spherical harmonic. For TIC 11619404, although the TEO phase is close to the m = +2 mode, the m = 0 mode cannot be excluded because of the low inclination in this system. The TEO phase in TIC 447927324 shows a large deviation (>2σ) from the adiabatic expectations, suggesting that it is expected to be a traveling wave or that the pulsations are nonadiabatic. In addition, these TEOs occur at relatively low orbital harmonics, and we cautiously suggest that this may be an observational bias. These objects are valuable sources for studying the structure and evolution of eccentricity orbit binaries and extending the TESS HBS catalog with TEOs.