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

Abstract

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.

22 pages, 13 figures, published in PRD

References in corpus (23)

• GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral
• Multi-messenger Observations of a Binary Neutron Star Merger
• Comprehensive nucleosynthesis analysis for ejecta of compact binary mergers
• Neutrino-driven winds from neutron star merger remnants
• Modeling GW170817 based on numerical relativity and its implications
• The dynamical mass ejection from binary neutron star mergers: Radiation-hydrodynamics study in general relativity
• AT2017gfo: an anisotropic and three-component kilonova counterpart of GW170817
• New Hyperon Equations of State for Supernovae and Neutron Stars in Density-dependent Hadron Field Theory
• High resolution numerical-relativity simulations for the merger of binary magnetized neutron stars
• Global simulations of axisymmetric radiative black hole accretion disks in general relativity with a sub-grid magnetic dynamo
• Full Transport Model of GW170817-Like Disk Produces a Blue Kilonova
• Post-merger evolution of a neutron star-black hole binary with neutrino transport
• On r-process nucleosynthesis from matter ejected in binary neutron starmergers
• Magnetorotational collapse of massive stellar cores to neutron stars: Simulations in full general relativity
• Mass ejection from neutron star mergers: different components and expected radio signals
• Post-merger Mass Ejection of Low-mass Binary Neutron Stars
• Neutrino transport in black hole-neutron star binaries: neutrino emission and dynamical mass ejection
• Dynamical ejecta from precessing neutron star-black hole mergers with a hot, nuclear-theory based equation of state
• The landscape of disk outflows from black hole - neutron star mergers
• A low-mass binary neutron star: long-term ejecta evolution and kilonovae with weak blue emission
• Viscous evolution of a massive disk surrounding stellar-mass black holes in full general relativity
• Long-term evolution of a merger-remnant neutron star in general relativistic magnetohydrodynamics I: Effect of magnetic winding
• General relativistic magnetohydrodynamic dynamo in thick accretion disks: fully nonlinear simulations

Cited by in corpus (33)

• General-relativistic neutrino-radiation magnetohydrodynamic simulation of seconds-long black hole-neutron star mergers
• Comprehensive study of mass ejection and nucleosynthesis in binary neutron star mergers leaving short-lived massive neutron stars
• Neutrino transport in general relativistic neutron star merger simulations
• End-to-end kilonova models of neutron-star mergers with delayed black-hole formation
• The Fast Flavor Instability in Hypermassive Neutron Star Disk Outflows
• Flares, jets and quasi-periodic outbursts from neutron star merger remnants
• MRI-driven $\alpha -\Omega$ dynamos in protoneutron stars
• Dynamical ejecta of neutron star mergers with nucleonic weak processes II: Kilonova emission
• General-relativistic neutrino-radiation magnetohydrodynamics simulation of seconds-long black hole-neutron star mergers: Dependence on initial magnetic field strength, configuration, and neutron-star equation of state
• Modeling general-relativistic plasmas with collisionless moments and dissipative two-fluid magnetohydrodynamics
• Long-term 3D-MHD Simulations of Black Hole Accretion Disks formed in Neutron Star Mergers
• Simulating bulk viscosity in neutron stars. II. Evolution in spherical symmetry
• Impact of systematic nuclear uncertainties on composition and decay heat of dynamical and disk ejecta in compact binary mergers
• Electromagnetic counterparts of binary neutron star mergers leading to a strongly magnetized long-lived remnant neutron star
• Can MAD accretion disks launching structured jets explain both GRB and AGN engines? Magnetically arrested accretion disks launching structured jets in application to GRB and AGN engines
• Production of $p$-nuclei from $r$-process seeds: the $\nu r$-process
• Assessment of a new sub-grid model for magneto-hydrodynamical turbulence. I. Magnetorotational instability
• On the synthesis of heavy nuclei in protomagnetar outflows and implications for ultra-high energy cosmic rays
• Late-time post-merger modeling of a compact binary: effects of relativity, r-process heating, and treatment of transport effects
• MRI turbulence in vertically stratified accretion discs at large magnetic Prandtl numbers
• Tayler-Spruit dynamo in binary neutron star merger remnants
• Assessment of a new sub-grid model for magnetohydrodynamical turbulence. II. Kelvin-Helmholtz instability
• Analytic solutions for the linearized first-order magnetohydrodynamics and implications for causality and stability
• Simulating bulk viscosity in neutron stars. I. Formalism
• Long-term impact of the magnetic-field strength on the evolution and electromagnetic emission by neutron-star merger remnants
• An effective model for magnetic field amplification by the magnetorotational and parasitic instabilities
• MRI-driven $\alpha \Omega$ dynamo at high Pm numbers
• Neutrinos in colliding neutron stars and black holes
• General relativistic magnetohydrodynamics simulations for binary neutron star mergers
• On the Origin of Pulsar and Magnetar Magnetic Fields
• MIR: a general-relativistic resistive-magneto-hydrodynamic code to study the effect of resistivity in Neutron Star dynamics
• Prospects for Neutrino Observation and Mass Measurement from Binary Neutron Star Mergers
• A New Moment-Based General-Relativistic Neutrino-Radiation Transport Code: Methods and First Applications to Neutron Star Mergers