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Area of Science:

  • Astrophysical Dynamics
  • Computational Astrophysics
  • High-Energy Astrophysics

Background:

  • Binary neutron star mergers are crucial events for understanding heavy element nucleosynthesis and the equation of state of matter.
  • Previous simulations were limited in duration, hindering the study of post-merger phenomena and jet formation.
  • Understanding the role of magnetic fields and neutrino radiation in these mergers is essential.

Purpose of the Study:

  • To perform the longest numerical-relativity neutrino-radiation magnetohydrodynamics simulation of a binary neutron star merger.
  • To investigate the prompt collapse to a black hole and subsequent jet launching.
  • To analyze the interplay of gravitational waves, neutrino emission, and mass ejection.

Main Methods:

  • Employed numerical relativity with neutrino-radiation magnetohydrodynamics.
  • Simulated a binary neutron star merger with asymmetric masses (1.25M⊙ and 1.65M⊙) using the SFHo equation of state.
  • Extended the simulation to approximately 1.5 seconds post-merger.

Main Results:

  • Observed a Poynting flux-driven collimated outflow (jet) with isotropic-equivalent luminosity of ~10^49 erg/s.
  • Confirmed gravitational wave and neutrino emission, along with dynamical and post-merger mass ejection.
  • Developed a magnetosphere dominated by an aligned global magnetic field penetrating the black hole.

Conclusions:

  • The simulation successfully captured prompt black hole formation and subsequent jet launching.
  • Magnetorotational instability-driven turbulence plays a key role in post-merger mass ejection.
  • The findings offer a self-consistent model for understanding jet production in binary neutron star mergers.