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Long-term evolution of neutron-star merger remnants in general relativistic resistive-magnetohydrodynamics with a mean-field dynamo term

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arxiv 2109.08732 v1 pith:OQ23S2WP submitted 2021-09-17 astro-ph.HE

Masaru Shibata , Sho Fujibayashi , Yuichiro Sekiguchi This is my paper
classification astro-ph.HE
keywords neutronstardynamohydrodynamicsmassivemean-fieldtorusviscous
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Long-term neutrino-radiation resistive-magnetohydrodynamics simulations in full general relativity are performed for a system composed of a massive neutron star and a torus formed as a remnant of binary neutron star mergers. The simulation is performed in axial symmetry incorporating a mean-field dynamo term for a hypothetical amplification of the magnetic-field strength. We first calibrate the mean-field dynamo parameters by comparing the results for the evolution of black hole-disk systems with viscous hydrodynamics results. We then perform simulations for the system of a remnant massive neutron star and a torus. As in the viscous hydrodynamics case, the mass ejection occurs primarily from the torus surrounding the massive neutron star. The total ejecta mass and electron fraction in the new simulation are similar to those in the viscous hydrodynamics case. However, the velocity of the ejecta can be significantly enhanced by magnetohydrodynamics effects caused by global magnetic fields.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Transport Properties of the MRI in Differentially Rotating Neutron Stars

    astro-ph.HE 2026-07 conditional novelty 6.0 of 10

    Saturated MRI turbulence in differentially rotating neutron stars yields ℓ_mix ≈ (0.01–0.1) λ_MRI, largely independent of density, so standard GRLES mixing-length prescriptions overestimate transport by about an order...

  2. Prospects for Neutrino Observation and Mass Measurement from Binary Neutron Star Mergers

    hep-ph 2025-11 conditional novelty 6.0 of 10

    Binary neutron star merger neutrinos will require a megaton-scale detector and decades of operation to detect, but a single detected neutrino could set a sub-eV (~0.1 eV) limit on the lightest neutrino mass via gravit...

  3. Neutrino pair annihilation driven jets from black-hole torus systems

    astro-ph.HE 2025-06 conditional novelty 5.0 of 10

    Neutrino pair annihilation in black hole-torus systems launches relativistic fireballs with isotropic energies up to about 10^51 erg and durations around 0.1 s, which can account for faint short GRBs and GRB precursors.

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