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arXiv 2510.00860astro-ph.HEastro-ph.SR
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X射线双星系统中黑洞自旋的演化研究:以XTE J1550-564为例

Understanding the evolution of black hole spin in X-ray binary systems: Case study of XTE~J1550-564

L. Bartolomeo Koninckx, M. A. De Vito, O. G. Benvenuto

AI总结:

本研究以XTE J1550-564为例,通过多参数模型探究黑洞X射线双星的自旋演化,发现现有模型难以解释观测到的中等自旋,仅极端保守的对流旋转增强磁制动模型可勉强复现结果。

摘要:

我们对X射线双星系统XTE J1550-564开展了综合研究,核心目标是分析黑洞自旋参数的演化。为实现这一目标,我们首先完成了该系统合理前身星的识别工作。通过采用覆盖多种参数组合的模型集,我们在可接受的误差范围内复现了该系统的观测特征,包括子星质量、轨道周期、供体星光度、有效温度等基本参数。模型结果显示,该系统存在多种演化路径的可能性,凸显了供体星初始质量与质量转移过程效率的重要作用。尽管部分模型与质量转移率的估计值吻合度较好,但所有模型都无法解释观测到的黑洞中等自旋值($a^* = 0.49$)。我们还探究了替代的磁制动机制,发现只有基于对流与旋转增强机制的极端完全守恒情形,才能复现观测到的自旋值,且仅能勉强符合。本研究旨在揭示黑洞X射线双星的复杂动力学,以及用理论模型解释其观测特性所面临的挑战。

英文摘要:

We present a comprehensive study of the X-ray binary system XTE~J1550-564, with the primary objective of analyzing the evolution of the black hole's spin parameter. To achieve this objective, we embarked on the necessary step of identifying a plausible progenitor for the system. Using a set of models covering various parameter combinations, we were able to replicate the system's observed characteristics within acceptable error margins, including fundamental parameters such as component masses, orbital period, donor luminosity, and effective temperature. The model results indicate the possibility of diverse evolutionary pathways for the system, highlighting the significant role played by the initial mass of the donor star and the efficiency of mass transfer episodes. While some models are well-aligned with estimates of the mass transfer rate, they all fall short of explaining the black hole's observed moderate spin ($a^* = 0.49$). We also explored alternative magnetic braking prescriptions, finding that only an extreme and fully conservative scenario, based on the convection and rotation boosted prescription, can reproduce the observed spin and only in a marginal way. Our study attempts to shed light on the complex dynamics of black hole X-ray binaries and the challenges of explaining their observed properties with theoretical models.

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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