Properties of the remnant disk and the dynamical ejecta produced in low-mass black hole-neutron star mergers

Abstract

We systematically perform numerical-relativity simulations for low-mass black hole-neutron star mergers for the models with seven mass ratios $Q=M_{\mathrm{BH}}/M_{\mathrm{NS}}$ ranging from 1.5 to 4.4, and three neutron-star equations of state, focusing on properties of matter remaining outside the black hole and ejected dynamically during the merger. We pay particular attention to the dependence on the mass ratio of the binaries. It is found that the rest mass remaining outside the apparent horizon after the merger depends only weakly on the mass ratio for the models with low mass ratios. It is also clarified that the rest mass of the ejecta has a peak at $Q\sim 3$, and decreases steeply as the mass ratio decreases for the low mass-ratio case. We present a novel analysis method for the behavior of matter during the merger, focusing on the matter distribution in the phase space of specific energy and specific angular momentum. Then we model the matter distribution during and after the merger. Using the result of the analysis, we discuss the properties of the ejecta.

16 pages, 9 figures

References in corpus (29)

• GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral
• Multi-messenger Observations of a Binary Neutron Star Merger
• Gravitational Waves and Gamma-rays from a Binary Neutron Star Merger: GW170817 and GRB 170817A
• GW190814: Gravitational Waves from the Coalescence of a 23 M${}_{\odot }$ Black Hole with a 2.6 M${}_{\odot }$ Compact Object
• Constraints on a phenomenologically parameterized neutron-star equation of state
• Black Hole-Neutron Star Mergers: Disk Mass Predictions
• Simulating coalescing compact binaries by a new code SACRA
• Fully General Relativistic Simulations of Black Hole-Neutron Star Mergers
• High-spin binary black hole mergers
• Relativistic simulations of black hole-neutron star coalescence: the jet emerges
• Evolving black hole-neutron star binaries in general relativity using pseudospectral and finite difference methods
• Relativistic Simulations of Black Hole-Neutron Star Mergers: Effects of black-hole spin
• Black hole-neutron star mergers at realistic mass ratios: Equation of state and spin orientation effects
• Neutron star-black hole mergers with a nuclear equation of state and neutrino cooling: Dependence in the binary parameters
• Merger of black hole and neutron star in general relativity: Tidal disruption, torus mass, and gravitational waves
• Merger of black hole-neutron star binaries in full general relativity
• Black hole-neutron star mergers: effects of the orientation of the black hole spin
• Black hole-neutron star binary merger: Dependence on black hole spin orientation and equations of state
• Merger of black hole-neutron star binaries: nonspinning black hole case
• Sub-radian-accuracy gravitational waveforms of coalescing binary neutron stars in numerical relativity
• Mergers of Magnetized Neutron Stars with Spinning Black Holes: Disruption, Accretion and Fallback
• Intermediate-mass-ratio black hole binaries: intertwining numerical and perturbative techniques
• Neutrino transport in black hole-neutron star binaries: neutrino emission and dynamical mass ejection
• Numerical simulations of neutron star-black hole binaries in the near-equal-mass regime
• General relativistic simulations of black hole-neutron star mergers: Effects of tilted magnetic fields
• Dynamical ejecta from precessing neutron star-black hole mergers with a hot, nuclear-theory based equation of state
• On the possibility of GW190425 being a black hole--neutron star binary merger
• Gravitational waveforms from SpEC simulations : neutron star-neutron star and low-mass black hole-neutron star binaries
• Is GW190425 consistent with being a neutron star$-$black hole merger?

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• 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
• Multimessenger Binary Mergers Containing Neutron Stars: Gravitational Waves, Jets, and $\mathbf{\gamma }$-Ray Bursts
• Exploring compact binary merger host galaxies and environments with $\mathrm{zELDA}$
• Fast ejecta as a potential way to distinguish black holes from neutron stars in high-mass gravitational-wave events
• Numerical-Relativity-Informed Effective-One-Body model for Black-Hole-Neutron-Star Mergers with Higher Modes and Spin Precession
• Formation of GW230529 from Isolated Binary Evolution
• Black hole-neutron star mergers with massive neutron stars in numerical relativity
• Hydrodynamic simulations of WD-WD mergers and the origin of RCB stars
• Stripping of a neutron star in a close binary system in a pair with a black hole
• Three-dimensional simulations of accretion disks in pre-CE systems