The Properties of Short Gamma-Ray Burst Jets Triggered by Neutron Star Mergers
The Properties of Short Gamma-Ray Burst Jets Triggered by Neutron Star Mergers
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DOI：
10.3847/2041-8213/aa5b9e
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发表时间：
2016-09
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影响因子：
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通讯作者：
A. Murguia-Berthier;E. Ramirez-Ruiz;G. Montes;F. De Colle;L. Rezzolla;S. Rosswog;K. Takami;A. Perego;William H. Lee
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作者：
A. Murguia-Berthier;E. Ramirez-Ruiz;G. Montes;F. De Colle;L. Rezzolla;S. Rosswog;K. Takami;A. Perego;William H. Lee
最流行的短伽玛射线暴（sGRB）模型涉及到中子星的合并。由于前身星实际上是隐藏在视线之外的，我们必须考虑在什么情况下这样的合并系统能够产生成功的sGRB。合并后不久，风从合并残余物中发射出来。在本文中，我们使用现实的风廓线来自全球合并模拟，以研究sGRB喷流与这些风的相互作用，使用数值模拟。我们分析的条件，这些轴对称风允许相对论射流爆发，并产生sGRB。我们发现，只有当它们的半张角小于20°时，亮度与sGRB中观察到的亮度相当的喷流才是成功的。这种喷流准直机制导致一个简单的物理解释的亮度和开放角度推断sGRB。如果观测到宽而低光度的喷流，它们可能预示着另一种起源途径，例如中子星星与黑洞的合并。我们还使用观测到的sGRB持续时间来限制风相的寿命，这是由喷气爆发所需的时间决定的。在所有情况下，我们发现，推导出的限制反对完全稳定的残余物的二进制中子星星合并，产生sGRB。
The most popular model for short gamma-ray bursts (sGRBs) involves the coalescence of binary neutron stars. Because the progenitor is actually hidden from view, we must consider under which circumstances such merging systems are capable of producing a successful sGRB. Soon after coalescence, winds are launched from the merger remnant. In this paper, we use realistic wind profiles derived from global merger simulations in order to investigate the interaction of sGRB jets with these winds using numerical simulations. We analyze the conditions for which these axisymmetric winds permit relativistic jets to break out and produce an sGRB. We find that jets with luminosities comparable to those observed in sGRBs are only successful when their half-opening angles are below ≈20°. This jet collimation mechanism leads to a simple physical interpretation of the luminosities and opening angles inferred for sGRBs. If wide, low-luminosity jets are observed, they might be indicative of a different progenitor avenue such as the merger of a neutron star with a black hole. We also use the observed durations of sGRB to place constraints on the lifetime of the wind phase, which is determined by the time it takes the jet to break out. In all cases we find that the derived limits argue against completely stable remnants for binary neutron star mergers that produce sGRBs.