Dec 11 – 15, 2023
Tsung-Dao Lee Institute
Asia/Shanghai timezone

The Collimation of Relativistic Jets in Post-Neutron Star Binary Merger Simulations

Dec 15, 2023, 2:45 PM
Poster Poster


Matteo Pais (Hebrew University of Jerusalem)


The gravitational waves from the binary neutron star merger GW170817 were accompanied by a multi-wavelength 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 magneto-rotational instability turbulence-driven) of a neutrino-radiation-GRMHD simulation of two coalescing neutron stars. We find that the presence of a post-merger 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.

Primary author

Matteo Pais (Hebrew University of Jerusalem)


Tsvi Piran (The Hebrew University of Jerusalem) Prof. Yuri Lyubarsky (Ben Gurion University) Dr Kenta Kiuchi (Einstein Institute for Gravitational Physics (Max Planck)) Prof. Masaru Shibata (Einstein Institute for Gravitational Physics (Max Planck))

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