期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 491, 期 3, 页码 3192-3216出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stz3231
关键词
gravitational waves; hydrodynamics; relativistic processes; shock waves; stars: neutron; ISM: jets and outflows; gamma-ray: burst
资金
- MEXT Japan
- JSPS KAKENHI [18H01213, 18H01215, 17H06357, 17H06362, 17H06131]
The gravitational wave event from the binary neutron star (BNS) merger GW170817 and the following multimessenger observations present strong evidence for (i) merger ejecta expanding with substantial velocities and (ii) a relativistic jet that had to propagate through the merger ejecta. The ejecta's expansion velocity is not negligible for the jet head motion, which is a fundamental difference from the other systems like collapsars and active galactic nuclei. Here we present an analytic model of the jet propagation in an expanding medium. In particular, we notice a new term in the expression of the breakout time and velocity. In parallel, we perform a series of over a hundred 2D numerical simulations of jet propagation. The BNS merger ejecta are prepared based on numerical relativity simulations of a BNS merger with the highest resolution to date. We show that our analytic results agree with numerical simulations over a wide parameter space. Then we apply our analytic model to GW170817, and obtain two solid constraints on: (i) the central engine luminosity as L-iso,L-0 similar to (3 x 10(49))-(2.5 x 10(52)) erg s(-1), and on (ii) the delay time between the merger and engine activation t(0) - t(m) < 1.3 s. The engine power implies that the apparently faint short gamma-ray burst (sGRB) sGRB 170817A is similar to typical sGRBs if observed on-axis.
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