Gravitational waves from the propagation of long gamma-ray burst jets
Gravitational waves from the propagation of long gamma-ray burst jets
复制标题
长伽马射线爆发喷流传播产生的引力波
DOI：
10.1093/mnras/stac3433
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发表时间：
2022
影响因子：
4.8
通讯作者：
Zanolin, Michele
中科院分区：
文献类型：
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作者：
Urrutia, Gerardo;De Colle, Fabio;Moreno, Claudia;Zanolin, Michele
伽玛射线暴（GRB）是在超相对论喷流传播过程中产生的。由于介质的高度不透明性，研究靠近中心源的射流具有挑战性。在本文中，我们提出的相对论射流传播通过一个大规模的，剥离信封星星与长伽玛暴，打破了星星和加速到星周介质的数值模拟。我们计算了喷流通过星星和星周介质传播时产生的引力波信号。我们表明，射流传播的关键参数可以直接由GW信号确定。该信号呈现出对应于喷流持续时间的第一峰值和对应于位于喷流轴附近的观测者的爆发时间的第二峰值（这又取决于恒星的大小），或者对应于离轴观测者的更大的时间（对应于加速阶段的结束）。我们还表明，GW信号的斜率之前和周围的第一个峰值跟踪喷流光度的历史和祖星星的结构。GW信号的振幅ish + D为数百至数千cm。虽然这个信号，对于河外源，是在目前的GW探测器的探测能力范围之外，它可以被未来的仪器，如BBO，DECIGO和ALIA探测到。我们的研究结果表明，未来的GRB喷流相关的GW检测可能代表了我们对这种现象的理解的革命。
Gamma-ray bursts (GRBs) are produced during the propagation of ultra-relativistic jets. It is challenging to study the jet close to the central source, due to the high opacity of the medium. In this paper, we present numerical simulations of relativistic jets propagating through a massive, stripped envelope star associated to long GRBs, breaking out of the star and accelerating into the circumstellar medium. We compute the gravitational wave (GW) signal resulting from the propagation of the jet through the star and the circumstellar medium. We show that key parameters of the jet propagation can be directly determined by the GW signal. The signal presents a first peak corresponding to the jet duration and a second peak which corresponds to the break-out time for an observer located close to the jet axis (which in turn depends on the stellar size), or to much larger times (corresponding to the end of the acceleration phase) for off-axis observers. We also show that the slope of the GW signal before and around the first peak tracks the jet luminosity history and the structure of the progenitor star. The amplitude of the GW signal ish+D∼ hundreds to several thousands cm. Although this signal, for extragalactic sources, is outside the range of detectability of current GW detectors, it can be detected by future instruments as BBO, DECIGO, and ALIA. Our results illustrate that future detections of GW associated to GRB jets may represent a revolution in our understanding of this phenomenon.