arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1706.04720astro-ph.HEastro-ph.SRnucl-th
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合并后超大质量夸克星的新状态方程

New equation of states for postmerger supramassive quark stars

Ang Li, Zhen-Yu Zhu, Xia Zhou

摘要:

基于早期X射线余辉中通常观察到的内部平台,中子星(NS)与随后快速旋转的超大质量磁星合并是至少一些短伽马射线暴(SGRB)的一个有吸引力的解释。在这种情况下,快速衰变阶段意味着恒星在旋转下降后坍缩成黑洞的时代,并可以有效地揭示致密物质的潜在不清楚状态方程(EoS)。在目前的工作中,我们面对的内部高原样品的代表性EoS模型的原磁星质量,与一个独立于观察到的银河系NS-NS二进制,旨在从SGRB观测贡献新的紧凑型恒星EoS。为此目的,我们采用各种EoS覆盖范围广泛的最大质量的NS和夸克星(QS),并在同一时间满足最近的观测约束的两个大质量的夸克星的质量被精确测量(周围$2 M_{\odot}$)。我们首先说明,如何以及基本的EoS将协调与当前的后验质量分布,在很大程度上是由静态最大质量的EoS。然后,我们构建了3个新的合并后QS EoS(PMQS 1,PMQS 2,PMQS 3),充分尊重观察到的分布。我们还提供了易于使用的参数化的EOS和相应的最大引力质量的旋转恒星。此外,我们计算的分数合并后的产品为每个EOS,并讨论潜在的后果,为磁星供电的kilonova模型。

英文摘要:

Binary neutron star (NS) mergers with their subsequent fast-rotating supramassive magnetars are one attractive interpretation for at least some short gamma-ray bursts (SGRBs), based on the internal plateau commonly observed in the early X-ray afterglow. The rapid decay phase in this scenario signifies the epoch when the star collapses to a black hole after it spins down, and could effectively shed light on the underlying unclear equation of state (EoS) of dense matter. In the present work, we confront the protomagnetar masses of the internal plateau sample from representative EoS models, with the one independently from the observed galactic NS-NS binary, aiming to contribute new compact star EoSs from SGRB observations. For this purpose, we employ various EoSs covering a wide range of maximum mass for both NSs and quark stars (QSs), and in the same time satisfying the recent observational constraints of the two massive pulsars whose masses are precisely measured (around $2 M_{\odot}$). We first illustrate that how well the underlying EoS would reconcile with the current posterior mass distribution, is largely determined by the static maximum mass of that EoS. We then construct 3 new postmerger QS EoSs (PMQS1, PMQS2, PMQS3), respecting fully the observed distribution. We also provide easy-to-use parameterizations for both the EoSs and the corresponding maximum gravitational masses of rotating stars. In addition, we calculate the fractions of postmerger products for each EoS, and discuss potential consequences for the magnetar-powered kilonova model.

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