The Collimation of Relativistic Jets in Post–Neutron Star Binary Merger Simulations
| Autor: | Matteo Pais, Tsvi Piran, Yuri Lyubarsky, Kenta Kiuchi, Masaru Shibata |
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| Jazyk: | angličtina |
| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | The Astrophysical Journal Letters, Vol 946, Iss 1, p L9 (2023) |
| Druh dokumentu: | article |
| ISSN: | 2041-8213 2041-8205 |
| DOI: | 10.3847/2041-8213/acc2c5 |
| Popis: | The gravitational waves from the binary neutron star merger GW170817 were accompanied by a multiwavelength electromagnetic counterpart, which confirms the association of the merger with a short gamma-ray burst (sGRB). The afterglow observations implied that the event was accompanied by a narrow, ∼5°, and powerful, ∼10 ^50 erg, jet. We study the propagation of a Poynting flux–dominated jet within the merger ejecta (kinematic, neutrino-driven, and magnetorotational instability turbulence-driven) of a neutrino-radiation-GRMHD simulation of two coalescing neutron stars. We find that the presence of a postmerger low-density/low-pressure polar cavity, which arose due to angular momentum conservation, is crucial to let the jet break out. At the same time the ejecta collimates the jet to a narrow opening angle. The collimated jet has a narrow opening angle of ∼4°–7° and an energy of 10 ^49 –10 ^50 erg, in line with the observations of GW170817 and other sGRBs. |
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