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Impact of neutrino-electron scattering and an improved treatment of pair processes on binary neutron star mergers
Francois Foucart, Samantha Rath, Rowan Davidson +5
Multimessenger observations of neutron star mergers are unique opportunities to constrain the properties of dense matter and the production site of heavy nuclei. To leverage these…
Assessing the Relative Importance of Neutrino Matter Interaction Channels in Post-Merger Remnant of Binary Neutron Stars
Samantha Rath, Francois Foucart, Lawrence E. Kidder +2
Neutron star mergers are amongst the most promising sources for the joint detection of gravitational waves and electromagnetic signals. They are also potential sites for the produc…
Eccentricity as a signature of hierarchical subsolar-mass mergers in collapsar disks
Jiaxi Wu, Elias R. Most, Nils L. Vu +4
In this work, we investigate gravitational-wave signatures of a proposed subsolar-mass merger scenario resulting from fragmentation inside a collapsar accretion disk. This scenario…
Robustness of neutron star merger simulations to changes in neutrino transport and neutrino-matter interactions
Francois Foucart, Patrick Chi-Kit Cheong, Matthew D. Duez +3
Binary neutron star mergers play an important role in nuclear astrophysics: their gravitational wave and electromagnetic signals carry information about the equation of state of co…
Black Hole-Neutron Star Binaries near Neutron Star Disruption Limit in the Mass Regime of Event GW230529
Tia Martineau, Francois Foucart, Mark Scheel +3
In May 2023, the LIGO Livingston observatory detected the likely black hole-neutron star (BHNS) merger GW230529_181500. That event is expected to be the merger of a 2.5-4.5 $M_{\od…
Dynamical ejecta from binary neutron star mergers: Impact of residual eccentricity and equation of state implementation
Francois Foucart, Matthew D. Duez, Lawrence E. Kidder +2
Predicting the properties of the matter ejected during and after a neutron star merger is crucial to our ability to use electromagnetic observations of these mergers to constrain t…
High angular momentum hot differentially rotating equilibrium star evolutions in conformally flat spacetime
Patrick Chi-Kit Cheong, Nishad Muhammed, Pavan Chawhan +5
The conformal flatness approximation to the Einstein equations has been successfully used in many astrophysical applications such as initial data constructions and dynamical simula…
A Unified Picture of Short and Long Gamma-ray Bursts from Compact Binary Mergers
Ore Gottlieb, Brian Metzger, Eliot Quataert +7
The recent detections of the -s long -ray bursts (GRBs) 211211A and 230307A followed by softer temporally extended emission (EE) and kilonovae, point to a new GRB class.…
Gravitational Waves from Binary Neutron Star Mergers with a Spectral Equation of State
Alexander Knight, Francois Foucart, Matthew D. Duez +4
In numerical simulations of binary neutron star systems, the equation of state of the dense neutron star matter is an important factor in determining both the physical realism and…
Large-scale Evolution of Seconds-long Relativistic Jets from Black Hole-Neutron Star Mergers
Ore Gottlieb, Danat Issa, Jonatan Jacquemin-Ide +11
We present the first numerical simulations that track the evolution of a black hole-neutron star (BH-NS) merger from pre-merger to . The disk that forms…
A positivity-preserving adaptive-order finite-difference scheme for GRMHD
Nils Deppe, Lawrence E. Kidder, Saul A. Teukolsky +6
We present an adaptive-order positivity-preserving conservative finite-difference scheme that allows a high-order solution away from shocks and discontinuities while guaranteeing p…
Simulating neutron stars with a flexible enthalpy-based equation of state parametrization in SpECTRE
Isaac Legred, Yoonsoo Kim, Nils Deppe +4
Numerical simulations of neutron star mergers represent an essential step toward interpreting the full complexity of multimessenger observations and constraining the properties of…
General relativistic simulations of collapsing binary neutron star mergers with Monte-Carlo neutrino transport
Francois Foucart, Matthew D. Duez, Roland Haas +4
Recent gravitational wave observations of neutron star-neutron star and neutron star-black hole binaries appear to indicate that massive neutron stars may not be too uncommon in me…
Implementation of Monte-Carlo transport in the general relativistic SpEC code
Francois Foucart, Matthew D. Duez, Francois Hebert +4
Neutrino transport and neutrino-matter interactions are known to play an important role in the evolution of neutron star mergers, and of their post-merger remnants. Neutrinos cool…
Monte-Carlo neutrino transport in neutron star merger simulations
Francois Foucart, Matthew D. Duez, Francois Hebert +3
Gravitational waves and electromagnetic signals from merging neutron star binaries provide valuable information about the the properties of dense matter, the formation of heavy ele…
Numerical simulations of neutron star-black hole binaries in the near-equal-mass regime
F. Foucart, M. D. Duez, L. E. Kidder +3
Simulations of neutron star-black hole (NSBH) binaries generally consider black holes with masses in the range , where we expect to find most stellar mass black hole…
Distinguishing the nature of comparable-mass neutron star binary systems with multimessenger observations: GW170817 case study
Tanja Hinderer, Samaya Nissanke, Francois Foucart +10
The discovery of GW170817 with gravitational waves (GWs) and electromagnetic (EM) radiation is prompting new questions in strong-gravity astrophysics. Importantly, it remains unkno…
Evolution of the Magnetized, Neutrino-Cooled Accretion Disk in the Aftermath of a Black Hole Neutron Star Binary Merger
Fatemeh Hossein Nouri, Matthew D. Duez, Francois Foucart +8
Black hole-torus systems from compact binary mergers are possible engines for gamma-ray bursts (GRBs). During the early evolution of the post-merger remnant, the state of the torus…
Dynamical ejecta from precessing neutron star-black hole mergers with a hot, nuclear-theory based equation of state
Francois Foucart, Dhruv Desai, Wyatt Brege +6
Neutron star-black hole binaries are among the strongest sources of gravitational waves detectable by current observatories. They can also power bright electromagnetic signals (gam…
SpECTRE: A Task-based Discontinuous Galerkin Code for Relativistic Astrophysics
Lawrence E. Kidder, Scott E. Field, Francois Foucart +11
We introduce a new relativistic astrophysics code, SpECTRE, that combines a discontinuous Galerkin method with a task-based parallelism model. SpECTRE's goal is to achieve more acc…
Impact of an improved neutrino energy estimate on outflows in neutron star merger simulations
Francois Foucart, Evan O'Connor, Luke Roberts +3
Binary neutron star mergers are promising sources of gravitational waves for ground-based detectors such as Advanced LIGO. Neutron-rich material ejected by these mergers may also b…
Post-merger evolution of a neutron star-black hole binary with neutrino transport
Francois Foucart, Evan O'Connor, Luke Roberts +7
We present a first simulation of the post-merger evolution of a black hole-neutron star binary in full general relativity using an energy-integrated general relativistic truncated…
Neutron star-black hole mergers with a nuclear equation of state and neutrino cooling: Dependence in the binary parameters
Francois Foucart, M. Brett Deaton, Matthew D. Duez +7
We present a first exploration of the results of neutron star-black hole mergers using black hole masses in the most likely range of , a neutrino leakage scheme…
Magnetic effects on the low-T/|W| instability in differentially rotating neutron stars
Curran D. Muhlberger, Fatemeh Hossein Nouri, Matthew D. Duez +6
Dynamical instabilities in protoneutron stars may produce gravitational waves whose observation could shed light on the physics of core-collapse supernovae. When born with sufficie…