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arXiv 2302.07092astro-ph.HEastro-ph.SRgr-qc
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核心坍缩超新星的引力波信号特征

The Gravitational-Wave Signature of Core-Collapse Supernovae

David Vartanyan, Adam Burrows, Tianshu Wang, Matthew S. B. Coleman, Christopher J. White

AI总结:

本文通过三维核心坍缩超新星模拟计算引力波信号,揭示原中子星f/g模振荡和吸积羽流是主要激发机制,并发现总引力波能量与前身星致密度强相关,不同恒星间发射差异可达三个数量级。

摘要:

我们计算了涵盖一系列大质量恒星的详细三维核心坍缩超新星模拟的引力波(GW)信号特征。大多数模拟进行到足够晚的时刻,以捕获总引力波发射的95%以上。我们发现原中子星振荡的f/g模和f模携带了大部分引力波功率。随着原中子星(PNS)核心收缩,f模频率不可阻挡地上升。我们证明,引力波发射主要由落到原中子星上的吸积羽流激发,这些吸积羽流为模态振荡提供能量,同时也激发与剧烈吸积阶段相关的高频(“雾状”)发射。主要发射阶段的持续时间随爆发前身星的不同而变化,并且总引力波辐射能量与前身星的致密度之间存在强相关性。此外,不同恒星之间的总引力波发射变化幅度可达三个数量级。对于黑洞形成的情形,引力波信号缓慢衰减,并未表现出爆发模型中看到的雾状特征。对于这类失败模型,我们还目睹了螺旋激波运动的出现,该运动以接近约100赫兹的频率调制引力波发射,并且随着停滞激波下沉,该频率缓慢增加。我们发现高频和低频(记忆)引力波发射均存在显著的角各向异性,尽管后者的功率非常小。

英文摘要:

We calculate the gravitational-wave (GW) signatures of detailed 3D core-collapse supernova simulations spanning a range of massive stars. Most of the simulations are carried out to times late enough to capture more than 95% of the total GW emission. We find that the f/g-mode and f-mode of proto-neutron star oscillations carry away most of the GW power. The f-mode frequency inexorably rises as the proto-neutron star (PNS) core shrinks. We demonstrate that the GW emission is excited mostly by accretion plumes onto the PNS that energize modal oscillations and also high-frequency (``haze") emission correlated with the phase of violent accretion. The duration of the major phase of emission varies with exploding progenitor and there is a strong correlation between the total GW energy radiated and the compactness of the progenitor. Moreover, the total GW emissions vary by as much as three orders of magnitude from star to star. For black-hole formation, the GW signal tapers off slowly and does not manifest the haze seen for the exploding models. For such failed models, we also witness the emergence of a spiral shock motion that modulates the GW emission at a frequency near $\sim$100 Hertz that slowly increases as the stalled shock sinks. We find significant angular anisotropy of both the high- and low-frequency (memory) GW emissions, though the latter have very little power.

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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