Black hole-neutron star mergers with massive neutron stars in numerical relativity

Abstract

We study the merger of black hole-neutron star (BH-NS) binaries in numerical relativity, focusing on the properties of the remnant disk and the ejecta, varying the mass of compactness of the NS and the mass and spin of the BH. We find that within the precision of our numerical simulations, the remnant disk mass and ejecta mass normalized by the NS baryon mass (${\hat{M}}_{\mathrm{rem}}$ and ${\hat{M}}_{\mathrm{eje}}$, respectively), and the cutoff frequency $f_{\mathrm{cut}}$ normalized by the initial total gravitational mass of the system at infinite separation approximately agree among the models with the same NS compactness $C_{\mathrm{NS}}=M_{\mathrm{NS}}/R_{\mathrm{NS}}$, mass ratio $Q=M_{\mathrm{BH}}/M_{\mathrm{NS}}$, and dimensionless BH spin ${\chi }_{\mathrm{BH}}$ irrespective of the NS mass $M_{\mathrm{NS}}$ in the range of $1.092$--$1.691M_{\odot }$. This result shows that the merger outcome depends sensitively on $Q$, ${\chi }_{\mathrm{BH}}$, and $C_{\mathrm{NS}}$ but only weekly on $M_{\mathrm{NS}}$. This justifies the approach of studying the dependence of NS tidal disruptions on the NS compactness by fixing the NS mass but changing the EOS. We further perform simulations with massive NSs of $M_{\mathrm{NS}}=1.8M_{\odot }$, and compare our results of ${\hat{M}}_{\mathrm{rem}}$ and ${\hat{M}}_{\mathrm{eje}}$ with those given by existing fitting formulas to test their robustness for more compact NSs. We find that the fitting formulas obtained in the previous studies are accurate within the numerical errors assumed, while our results also suggest that further improvement is possible by systematically performing more precise numerical simulations.

19 pages, 14 figures

References in corpus (42)

• GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral
• Shapiro delay measurement of a two solar mass neutron star
• A Massive Pulsar in a Compact Relativistic Binary
• 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
• An Ordinary Short Gamma-Ray Burst with Extraordinary Implications: Fermi-GBM Detection of GRB 170817A
• Spectroscopic identification of r-process nucleosynthesis in a double neutron star merger
• INTEGRAL Detection of the First Prompt Gamma-Ray Signal Coincident with the Gravitational Wave Event GW170817
• Light Curves of the Neutron Star Merger GW170817/SSS17a: Implications for R-Process Nucleosynthesis
• Constraints on a phenomenologically parameterized neutron-star equation of state
• Observation of gravitational waves from two neutron star-black hole coalescences
• Formation of Double Neutron Star Systems
• GW170817: Joint Constraint on the Neutron Star Equation of State from Multimessenger Observations
• 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
• Black hole-neutron star mergers at realistic mass ratios: Equation of state and spin orientation effects
• Relativistic Simulations of Black Hole-Neutron Star Mergers: Effects of black-hole spin
• Neutron star-black hole mergers with a nuclear equation of state and neutrino cooling: Dependence in the binary parameters
• Merger of black hole-neutron star binaries in full general relativity
• Merger of black hole and neutron star in general relativity: Tidal disruption, torus mass, and gravitational waves
• 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
• GROWTH on S190814bv: Deep Synoptic Limits on the Optical/Near-Infrared Counterpart to a Neutron Star-Black Hole Merger
• 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
• A new public code for initial data of unequal-mass, spinning compact-object binaries
• 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
• Prospects for joint gravitational-wave and electromagnetic observations of neutron-star--black-hole coalescing binaries
• Implementation of advanced Riemann solvers in a neutrino-radiation magnetohydrodynamics code in numerical relativity and its application to a binary neutron star merger
• Filling the Mass Gap: How Kilonova Observations can Unveil the Nature of the Compact Object Merging with the Neutron Star

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