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arXiv 2508.03463astro-ph.HEgr-qc
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密近白矮星双星被中等质量黑洞潮汐破坏

Tidal disruptions of close white dwarf binaries by intermediate mass black holes

Indian Institute of Technology Kanpur(坎普尔印度理工学院);Indian Institute of Technology Kharagpur(卡拉格普尔印度理工学院)

Aryabrat Mahapatra, Adarsh Pandey, Pritam Banerjee, Tapobrata Sarkar

AI总结:

研究通过数值模拟探讨密近白矮星双星与中等质量黑洞的潮汐破坏过程,分析双星位置配置对事件结果的影响,揭示非相同质量双星与相同质量双星在质量回落率、 kicks 速度和引力波等方面的差异。

摘要:

我们利用光滑粒子流体动力学对潮汐破坏事件进行了数值模拟,研究由两个低质量白矮星和一个非自转的中等质量黑洞组成的密近双星系统。双星组件被认为处于与黑洞同一平面且分离的状态。我们的结果量化了这些事件的结果如何关键地依赖于双星组件在轨道近心点的位置配置,并展示了非相同质量双星与相同质量双星在可观测属性上的显著差异。我们强调这些差异在质量回落率、 kicks 速度和引力波等可观测属性上,并计算了恒星碎片中的团块形成时间。在我们的设定中,顺行双星运动,其中双星的角动量方向与黑洞周围质心运动方向相同,与单星潮汐破坏的多个事件在定性上相似。然而,我们认为在相应的逆行场景中,恒星碎片之间的相互作用导致了不同的和独特的结果。我们的结果应作为潮汐相互作用在观测方面的一个指示性基准。

英文摘要:

We perform a suite of numerical simulations of tidal disruption events, using smoothed particle hydrodynamics, for a close binary system consisting of two low-mass white dwarfs, and an intermediate mass non-spinning black hole. The binary components are considered to be detached and on the same plane with the black hole. Our results quantify how the outcomes of these events depend crucially on the positional configuration of the binary components at the orbital pericenter, and we also show how distinctive behaviour for non-identical mass binaries arise, as compared to identical ones. We highlight these differences on observables such as mass fallback rates, kick velocities and gravitational waves, and also compute clump formation time within the stellar debris. In our setup, prograde binary motion, where the angular momentum of the binary is in the same direction as that of the center of mass motion around the black hole, is qualitatively similar to multiple events of single star tidal disruptions. However, we argue that interactions between stellar debris in the corresponding retrograde scenarios result in different and distinct outcomes. Our results should serve as indicative benchmarks in the observational aspects of tidal interactions between close white dwarf binaries and intermediate mass black holes.

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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