Probing mass-radius relation of protoneutron stars from gravitational-wave asteroseismology
Probing mass-radius relation of protoneutron stars from gravitational-wave asteroseismology
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从引力波星震学探测原中子星的质量半径关系
DOI：
10.1103/physrevd.96.063005
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发表时间：
2017
影响因子：
5
通讯作者：
Kotake Kei
中科院分区：
文献类型：
--
作者：
Sotani Hajime;Kuroda Takami;Takiwaki Tomoya;Kotake Kei
引力波小行星地震学是提取致密天体内部信息的有力手段。在这项工作中，我们重点研究了原中子星(PNS)在核心崩塌超新星的反弹后阶段所发射的GWS的时空模。利用最近三维超新星模型的结果，我们研究了如何在GW星震学的背景下，基于准正规模式分析来推断PNS的性质。我们发现，单模频率乘以PNS半径可以表示为PNS质量与PNS半径之比的线性函数。该关系对本工作中使用的核物态方程(EOS)不敏感。结合单模振动的另一个普遍关系，我们指出，通过同时观测双模和双模GW，可以得到PNS的含时质量-半径关系。我们的结果表明，同时探测这两种模式可以为研究决定PNS演化的有限温度核状态方程提供一个新的探索途径。
The gravitational-wave (GW) asteroseismology is a powerful technique for extracting interior information of compact objects. In this work, we focus on spacetime modes, the so-calledmodes, of GWs emitted from a proto-neutron star (PNS) in the postbounce phase of core-collapse supernovae. Using results from recent three-dimensional supernova models, we study how to infer the properties of the PNS based on a quasi-normal mode analysis in the context of the GW asteroseismology. We find that the-mode frequency multiplied by the PNS radius is expressed as a linear function with respect to the ratio of the PNS mass to the PNS radius. This relation is insensitive to the nuclear equation of state (EOS) employed in this work. Combining with another universal relation of the-mode oscillations, we point out that the time dependent mass-radius relation of the PNS can be obtained by observing both the- and-mode GWs simultaneously. Our results suggest that the simultaneous detection of the two modes could provide a new probe into finite-temperature nuclear EOS that predominantly determines the PNS evolution.