论文标题
长寿命二进制中子星级合并残留物的准直流
Collimated outflows from long-lived binary neutron star merger remnants
论文作者
论文摘要
GRB 170817A与合并事件GW170817的关联最近证实了短伽马射线爆发（SGRB）与二进制中子星（BNS）合并之间的连接。但是，没有关于供电SGRB射流的合并残留物是一个积聚的黑洞（BH）还是长寿命的大型中子星（NS）。在这里，我们通过BNS合并模拟探索后一种情况，在合并后覆盖250毫秒。我们首次在完整的合并模拟中报告了沿NS残留物的自旋轴的磁驱动的准直流流出的形成。对于手头的系统，发现此类流出的特性与SGRB射流基本上不兼容。通过适当考虑我们目前调查的局限性和警告，我们的结果一般而言是GRB 170817A和SGRB的BH起源。即使需要通过探索更大的物理条件来确认这一结论，我们简要讨论了通过积聚BHS提供动力的所有SGRB喷气机的可能后果。
The connection between short gamma-ray bursts (SGRBs) and binary neutron star (BNS) mergers was recently confirmed by the association of GRB 170817A with the merger event GW170817. However, no conclusive indications were obtained on whether the merger remnant that powered the SGRB jet was an accreting black hole (BH) or a long-lived massive neutron star (NS). Here, we explore the latter case via BNS merger simulations covering up to 250 ms after merger. We report, for the first time in a full merger simulation, the formation of a magnetically-driven collimated outflow along the spin axis of the NS remnant. For the system at hand, the properties of such an outflow are found largely incompatible with a SGRB jet. With due consideration of the limitations and caveats of our present investigation, our results favour a BH origin for GRB 170817A and SGRBs in general. Even though this conclusion needs to be confirmed by exploring a larger variety of physical conditions, we briefly discuss possible consequences of all SGRB jets being powered by accreting BHs.
