arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2104.12410astro-ph.HEastro-ph.SRgr-qc
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双中子星合并环境中短伽马射线暴喷流传播

Short gamma-ray burst jet propagation in binary neutron star merger environments

Andrea Pavan, Riccardo Ciolfi, Jay Vijay Kalinani, Andrea Mignone

摘要:

多信使事件GW 170817/GRB 170817 A证实了中子星合并可以产生短的伽马射线暴(SGRB)喷流。这一证据促进了新的调查机制,通过该机制,BNS合并残余物可以推出这样一个强大的相对论外流和传播后者在周围的合并后的环境。特别是,已经取得了很大的进步,在射流传播模型,建立连接的初始射流发射条件,包括初期射流发射时间(相对于合并)和注射参数,和可观察到的SGRB提示和余辉发射。然而,目前的半分析模型和数值模拟(有一个明显的例外)采用简单的手工处方,以考虑合并后的环境,缺乏直接关联的任何特定的合并BNS系统。在这里,我们提出了第一个三维相对论流体动力学模拟的初期SGRB射流传播通过合并后的环境,直接进口从以前的广义相对论BNS合并模拟的结果。我们的研究结果表明,射流的演化和最终性质可以在很大程度上受到各向异性和偏离轴对称和同源膨胀表征更现实的BNS合并环境。此外,我们发现,包含的引力从中央紧凑的对象,往往被忽视,可以有重大影响。最后,我们考虑不同的喷气发动机发射时间参考相同的BNS合并模型,并讨论最终的喷气性能的后果。

英文摘要:

The multimessenger event GW170817/GRB 170817A confirmed that binary neutron star (BNS) mergers can produce short gamma-ray burst (SGRB) jets. This evidence promoted new investigations on the mechanisms through which a BNS merger remnant can launch such a powerful relativistic outflow and on the propagation of the latter across the surrounding post-merger environment. In particular, great strides have been made in jet propagation models, establishing connections between the initial jet launching conditions, including the incipient jet launching time (with respect to merger) and the injection parameters, and the observable SGRB prompt and afterglow emission. However, present semi-analytical models and numerical simulations (with one notable exception) adopt simple hand-made prescriptions to account for the post-merger environment, lacking a direct association with any specific merging BNS system. Here, we present the first three-dimensional relativistic hydrodynamics simulations of incipient SGRB jets propagating through a post-merger environment that is directly imported from the outcome of a previous general relativistic BNS merger simulation. Our results show that the evolution and final properties of the jet can be largely affected by the anisotropies and the deviations from axisymmetry and homologous expansion characterizing more realistic BNS merger environments. In addition, we find that the inclusion of the gravitational pull from the central compact object, often overlooked, can have a major impact. Finally, we consider different jet launching times referred to the same BNS merger model and discuss the consequences for the ultimate jet properties.

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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