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arXiv 2603.04559astro-ph.HE
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重复的核暂现现象来自重复的部分潮汐破坏事件

Repeating Nuclear Transients from Repeating Partial Tidal Disruption Events

Syracuse University(雪城大学);University of Leeds(利兹大学);MIT Kavli Institute for Astrophysics and Space Research(麻省理工学院卡弗里天体物理与空间研究所)

Ananya Bandopadhyay, Eric R. Coughlin, Julia Fancher, C. J. Nixon, Dheeraj R. Pasham

AI总结:

该研究探讨了重复部分潮汐破坏事件对恒星质量损失的影响,发现高质量恒星能承受多次质量剥离,而低质量恒星则易被摧毁。

摘要:

extragalactic 核暂现现象如果表现出重复爆发,可以被建模为受束缚恒星与超大质量黑洞(SMBH)之间重复的动态相互作用。其中一部分暂现现象,其复发时间尺度为数月至数年,已被解释为由SMBH对恒星的重复潮汐剥离所引发的吸积耀斑,属于重复的部分潮汐破坏事件(rpTDE)。我们概述了rpTDE模型的范围,并讨论了关于受重复质量损失影响的恒星稳定性以及这些耀斑长期演化的水动力学模拟和解析预测,这些演化的结果取决于恒星类型和轨道参数。我们的发现表明,高质量和中心集中度的恒星在受到小量(约1-10% M_\star)质量损失时,其结构变化微乎其微,可以经受多次质量剥离接触。相反,低质量和不那么演化的恒星对质量损失不稳定,会在几次轨道内被摧毁。我们讨论了这些结果对约束观测源的恒星类型和轨道参数的意义,例如ASASSN-14ko,其已观测到超过20次耀斑,以及AT2020vdq,其第二次耀斑比其主爆发更亮。

英文摘要:

Extragalactic nuclear transients that exhibit repeating outbursts can be modeled as the repeated dynamical interaction between bound stars and supermassive black holes (SMBHs). A subset of these transients, with recurrence timescales of months-to-years, have been explained as accretion flares from the repeated tidal stripping of a star by an SMBH, in a repeating partial tidal disruption event (rpTDE). We outline the scope of the rpTDE model and discuss hydrodynamical simulations and analytical predictions for the stability of stars undergoing repeated mass loss, and the long-term evolution of these flares as a function of stellar type and orbital parameters. Our findings demonstrate that high-mass and centrally concentrated stars undergo negligible changes in structure in response to small amounts ($\sim 1-10\% M_\star$) of mass loss, and can survive many mass-stripping encounters with an SMBH. Contrarily, low-mass and less evolved stars are unstable to mass loss, and would be destroyed within a few orbits. We discuss the implications of these results for constraining the stellar type and orbital parameters of observed sources, such as ASASSN-14ko, for which $\gtrsim 20$ flares have been observed, and AT2020vdq, which exhibits a second flare that is brighter than its primary outburst.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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