TY - JOUR
T1 - The Collimation of Relativistic Jets in Post-Neutron Star Binary Merger Simulations
AU - Pais, Matteo
AU - Piran, Tsvi
AU - Lyubarsky, Yuri
AU - Kiuchi, Kenta
AU - Shibata, Masaru
N1 - Publisher Copyright:
© 2023. The Author(s). Published by the American Astronomical Society.
PY - 2023/3/1
Y1 - 2023/3/1
N2 - 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, ∼1050 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 1049-1050 erg, in line with the observations of GW170817 and other sGRBs.
AB - 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, ∼1050 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 1049-1050 erg, in line with the observations of GW170817 and other sGRBs.
UR - http://www.scopus.com/inward/record.url?scp=85150833534&partnerID=8YFLogxK
U2 - 10.3847/2041-8213/acc2c5
DO - 10.3847/2041-8213/acc2c5
M3 - Article
AN - SCOPUS:85150833534
SN - 2041-8205
VL - 946
JO - Astrophysical Journal Letters
JF - Astrophysical Journal Letters
IS - 1
M1 - L9
ER -