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Prospects for optical detections from binary neutron star mergers with the next-generation multi-messenger observatories
E. Loffredo, N. Hazra, U. Dupletsa +13
Next-generation gravitational wave (GW) observatories, such as the Einstein Telescope (ET) and Cosmic Explorer, will observe binary neutron star (BNS) mergers across cosmic history…
XKN: a Semi-analytic Framework for the Modelling of Kilonovae
Giacomo Ricigliano, Albino Perego, Ssohrab Borhanian +4
After GW170817, kilonovae have become of great interest for the astronomical, astrophysics and nuclear physics communities, due to their potential in revealing key information on t…
Neutrino trapping and out-of-equilibrium effects in binary neutron star merger remnants
Pedro Luis Espino, Peter Hammond, David Radice +5
We study out-of-thermodynamic equilibrium effects in neutron star mergers with 3D general-relativistic neutrino-radiation large-eddy simulations. During merger, the cores of the ne…
What if GW190425 did not produce a black hole promptly?
David Radice, Giacomo Ricigliano, Mukul Bhattacharya +3
It is widely believed that the binary neutron star merger GW190425 produced a black hole promptly upon merger. Motivated by the potential association with the fast radio burst FRB…
Outflows from Short-Lived Neutron-Star Merger Remnants Can Produce a Blue Kilonova
Sanjana Curtis, Pablo Bosch, Philipp Mösta +5
We present a 3D general-relativistic magnetohydrodynamic simulation of a short-lived neutron star remnant formed in the aftermath of a binary neutron star merger. The simulation us…
Binary neutron star merger simulations with neutrino transport and turbulent viscosity: impact of different schemes and grid resolution
Francesco Zappa, Sebastiano Bernuzzi, David Radice +1
We present a systematic numerical relativity study of the impact of different treatment of microphysics and grid resolution in binary neutron star mergers. We consider series of si…
Muons in the aftermath of neutron star mergers and their impact on trapped neutrinos
Eleonora Loffredo, Albino Perego, Domenico Logoteta +1
In the upcoming years, present and next-generation gravitational wave observatories will detect a larger number of binary neutron star (BNS) mergers with increasing accuracy. In th…
Multi-messenger observations of binary neutron star mergers in the O4 run
A. Colombo, O. S. Salafia, F. Gabrielli +4
We present realistic expectations for the number and properties of neutron star binary mergers to be detected as multi-messenger sources during the upcoming fourth observing run (O…
Numerical relativity simulations of the neutron star merger GW190425: microphysics and mass ratio effects
A. Camilletti, L. Chiesa, G. Ricigliano +7
GW190425 was the second gravitational wave (GW) signal compatible with a binary neutron star (BNS) merger detected by the Advanced LIGO and Advanced Virgo detectors. Since no elect…
Probing the incompressibility of nuclear matter at ultra-high density through the prompt collapse of asymmetric neutron star binaries
A. Perego, D. Logoteta, D. Radice +5
Using 250 neutron star merger simulations with microphysics, we explore for the first time the role of nuclear incompressibility in the prompt collapse threshold for binaries with…
-process Nucleosynthesis and Kilonovae from Hypermassive Neutron Star Remnants
Sanjana Curtis, Philipp Mösta, Zhenyu Wu +4
We investigate -process nucleosynthesis and kilonova emission resulting from binary neutron star (BNS) mergers based on a three-dimensional (3D) general-relativistic magnetohydr…
A New Moment-Based General-Relativistic Neutrino-Radiation Transport Code: Methods and First Applications to Neutron Star Mergers
David Radice, Sebastiano Bernuzzi, Albino Perego +1
We present a new moment-based energy-integrated neutrino transport code for neutron star merger simulations in general relativity. In the merger context, ours is the first code to…
Neutrino emission from binary neutron star mergers: characterizing light curves and mean energies
Marco Cusinato, Federico Maria Guercilena, Albino Perego +4
Neutrinos are copiously emitted by neutron star mergers, due to the high temperatures reached by dense matter during the merger and its aftermath. Neutrinos influence the merger dy…
Radiation hydrodynamics modeling of kilonovae with SNEC
Zhenyu Wu, Giacomo Ricigliano, Rahul Kashyap +2
We develop a method to compute synthetic kilonova light curves that combines numerical relativity simulations of neutron star mergers and the radiation-hydrodynamic…
Numerical relativity simulations of prompt collapse mergers: threshold mass and phenomenological constraints on neutron star properties after GW170817
Rahul Kashyap, Abhishek Das, David Radice +10
We determine the threshold mass for prompt (no bounce) black hole formation in equal-mass neutron star (NS) mergers using a new set of 227 numerical relativity simulations. We cons…
-process nucleosynthesis from compact binary mergers
Albino Perego, Friedrich-Karl Thielemann, Gabriele Cescutti
The merger of two neutron stars or of a neutron star and a black hole often result in the ejection of a few percents of a solar mass of matter expanding at high speed in space. Bei…
Signatures of deconfined quark phases in binary neutron star mergers
Aviral Prakash, David Radice, Domenico Logoteta +6
(abridged) We investigate the quark deconfinement phase transition in the context of binary neutron star (BNS) mergers. We employ a new finite-temperature composition-dependent equ…
The peculiar short-duration GRB 200826A and its supernova
A. Rossi, B. Rothberg, E. Palazzi +31
Gamma-ray bursts (GRBs) are classified as long and short events. Long GRBs (LGRBs) are associated with the end states of very massive stars, while short GRBs (SGRBs) are linked to…
Dynamical ejecta synchrotron emission as possible contributor to the changing behaviour of GRB170817A
Vsevolod Nedora, David Radice, Sebastiano Bernuzzi +5
Over the past three years, the fading non-thermal emission from the GW170817 remained generally consistent with the afterglow powered by synchrotron radiation produced by the inter…
Calibration of the Advanced Spectral Leakage scheme for neutron star merger simulations, and extension to smoothed-particle hydrodynamics
Davide Gizzi, Christoffer Lundman, Evan O'Connor +2
We calibrate a neutrino transport approximation, called Advanced Spectral Leakage (ASL), with the purpose of modeling neutrino-driven winds in neutron star mergers. Based on a numb…
In-plasma study of opacity relevant for compact binary ejecta
Angelo Pidatella, Sergio Cristallo, Alessio Galatà +7
In the context of the INFN project PANDORA_Gr3 (Plasma for Astrophysics, Nuclear Decays Observation and Radiation for Archaeometry) and of multi-messenger astronomy, we propose a f…
AT2017gfo: Bayesian inference and model selection of multi-component kilonovae and constraints on the neutron star equation of state
Matteo Breschi, Albino Perego, Sebastiano Bernuzzi +4
The joint detection of the gravitational wave GW170817, of the short -ray burst GRB170817A and of the kilonova AT2017gfo, generated by the the binary neutron star merger observe…
Mapping dynamical ejecta and disk masses from numerical relativity simulations of neutron star mergers
Vsevolod Nedora, Federico Schianchi, Sebastiano Bernuzzi +6
We present fitting formulae for the dynamical ejecta properties and remnant disk masses from the largest to date sample of numerical relativity simulations. The considered data inc…
Numerical Relativity Simulations of the Neutron Star Merger GW170817: Long-Term Remnant Evolutions, Winds, Remnant Disks, and Nucleosynthesis
Vsevolod Nedora, Sebastiano Bernuzzi, David Radice +7
We present a systematic numerical-relativity study of the dynamical ejecta, winds and nucleosynthesis in neutron star merger remnants. Binaries with the chirp mass compatible with…