We present results of a systematic study failing core-collapse supernovae and the formation stellar-mass black holes (BHs). Using our open-source general-relativistic 1.5D code GR1D equipped with three-species neutrino leakage/heating scheme over 100 presupernova models, we effects choice nuclear equation state (EOS), zero-age main sequence (ZAMS) mass metallicity, rotation, mass-loss prescription on BH formation. find that outcome, for given EOS, can be estimated, to first order, by single...

We present the new open-source spherically symmetric general-relativistic (GR) hydrodynamics code GR1D. It is based on Eulerian formulation of GR (GRHD) put forth by Romero–Ibáñez–Gourgoulhon and employs radial-gauge, polar-slicing coordinates in which 3+1 equations simplify substantially. discretize GRHD with a finite-volume scheme, employing piecewise-parabolic reconstruction an approximate Riemann solver. GR1D intended for simulation stellar collapse to neutron stars black holes will also...

The details of the physical mechanism that drives core-collapse supernovae (CCSNe) remain uncertain. While there is an emerging consensus on qualitative outcome detailed CCSN simulations in 2D, only recently have high-fidelity 3D become possible. Here we present results extensive set using multidimensional neutrino transport, high-resolution hydrodynamics, and approximate general relativistic gravity. We employ a state-of-the-art 20 solar mass progenitor generated Modules for Experiments...

We study the merger of binary neutron stars using different realistic, microphysical nuclear equations state, as well incorporating magnetic field and neutrino cooling effects. In particular, we concentrate on influence equation state gravitational wave signature also its role, in combination with electromagnetic effects, determining properties hypermassive star resulting from merger, production neutrinos, characteristics ejecta system. The find are consistent other recent studies that soft...

Neutron star mergers are among the most promising sources of gravitational waves for advanced ground-based detectors. These also expected to power bright electromagnetic signals, in form short gamma-ray bursts, infrared/optical transients powered by r-process nucleosynthesis neutron-rich material ejected merger, and radio emission from interaction that ejecta with interstellar medium. Simulations these fully general relativistic codes critical understand merger postmerger wave signals their...

We present an open-source update to the spherically-symmetric, general-relativistic hydrodynamics, core-collapse supernova (CCSN) code GR1D (O'Connor & Ott, 2010, CQG, 27, 114103). The source is available at http://www.GR1Dcode.org. extend its capabilities include a general relativistic treatment of neutrino transport based on moment formalisms Shibata et al., 2011, PTP, 125, 1255 and Cardall 2013, PRD, 87 103004. pay special attention implementing testing numerical methods...

ABSTRACT The explosion mechanism of a core-collapse supernova (SN) is complex interplay between neutrino heating and cooling (including the effects neutrino-driven convection), gravitational potential, ram pressure infalling material. To analyse post-bounce phase an SN, one can use generalized force condition (FEC+), which succinctly formalizes among these four phenomena in analytical condition, consistent with realistic simulations. In this paper, we FEC+ to study 341 spherically symmetric...

We report on a set of long-term general-relativistic three-dimensional (3D) multi-group (energy-dependent) neutrino-radiation hydrodynamics simulations core-collapse supernovae. employ full 3D two-moment scheme with the local M1 closure, three neutrino species, and 12 energy groups per species. With this, we follow post-core-bounce evolution core nonrotating $27$-$M_\odot$ progenitor in unconstrained octant symmetry for $\gtrsim$$ 380\,\mathrm{ms}$. find development an asymmetric runaway...

We study the merger of binary neutron stars with different mass ratios adopting three realistic, microphysical nuclear equations state, as well incorporating neutrino cooling effects. In particular, we concentrate on influence equation state gravitational wave signature and also its role, in combination cooling, determining properties resulting hypermassive star, neutrinos produced, ejected material. The ejecta find are consistent other recent studies that small produce more than equal cases...

We present a first exploration of the results neutron star-black hole mergers using black masses in most likely range $7M_\odot-10M_\odot$, neutrino leakage scheme, and modeling star material through finite-temperature nuclear-theory based equation state. In spins which is tidally disrupted ($\chi_{\rm BH}\gtrsim 0.7$), we show that merger consistently produces large amounts cool ($T\lesssim 1\,{\rm MeV}$), unbound, neutron-rich ($M_{\rm ej}\sim 0.05M_\odot-0.20M_\odot$). A comparable amount...

We present a first simulation of the post-merger evolution black hole-neutron star binary in full general relativity using an energy-integrated relativistic truncated moment formalism for neutrino transport. describe our implementation and important tests code, before studying formation phase disk after merger. use as initial data existing merger neutron 1.4 solar mass with hole 7 dimensionless spin a/M=0.8. Comparing simpler leakage scheme treatment neutrinos, we find noticeable differences...

Compact binary mergers involving at least one neutron star are important sources of gravitational waves. To fully describe such mergers, however, requires not only general relativity but also nuclear physics, hydrodynamics, and neutrino transport. The paper by Foucart et al. marks a significant step in this direction showing the sensitivity observables to energy spectrum.

Abstract We present results from simulations of core-collapse supernovae in FLASH using a newly implemented multidimensional neutrino transport scheme and general relativistic (GR) treatment gravity. use two-moment method with an analytic closure (so-called M1 transport) for the transport. This is multienergy, multispecies, velocity dependent, truly multidimensional, i.e., we do not assume commonly used “ray-by-ray” approximation. Our GR gravity our Newtonian hydrodynamics via effective...

We perform 3+1 general relativistic simulations of rotating core collapse in the context collapsar model for long gamma-ray bursts. employ a realistic progenitor, rotation based on results stellar evolution calculations, and simplified equation state. Our track self-consistently collapse, bounce, postbounce phase, black hole formation, subsequent early hyperaccretion phase. extract gravitational waves from spacetime curvature identify unique wave signature associated with phase formation.

We study the three-dimensional (3D) hydrodynamics of post-core-bounce phase collapse a 27-solar-mass star and pay special attention to development standing accretion shock instability (SASI) neutrino-driven convection. To this end, we perform 3D general-relativistic simulations with 3-species neutrino leakage scheme. The scheme captures essential aspects cooling, heating, lepton number exchange as predicted by radiation-hydrodynamics simulations. progenitor was studied in 2D B. Mueller et...

Gravitational waves (GWs) generated by axisymmetric rotating collapse, bounce, and early postbounce phases of a galactic core-collapse supernova are detectable current-generation gravitational wave observatories. Since these GWs emitted from the quadrupole-deformed nuclear-density core, they may encode information on uncertain nuclear equation state (EOS). We examine effects EOS core collapse carry out 1824 general-relativistic hydrodynamic simulations that cover parameter space 98 different...

The merger of two neutron stars leaves behind a rapidly spinning hypermassive object whose survival is believed to depend on the maximum mass supported by nuclear equation state (EOS), angular momentum redistribution (magneto-)rotational instabilities, and spindown gravitational waves. high temperatures (∼5–40 MeV) prevailing in remnant may provide thermal pressure support that could increase its and, thus, life neutrino-cooling timescale. We investigate role remnants computing sequences...

We incorporate realistic, tabulated equations of state into fully relativistic simulations magnetized neutron stars along with a neutrino leakage scheme which accounts for cooling via emission. Both these improvements utilize open-source code (GR1D) and tables from the Web site stellarcollapse.org. Our implementation makes use novel method calculation optical depth, simplifies its distributed adaptive mesh refinement. present various tests without magnetization preliminary results both...

Three-dimensional simulations of core-collapse supernovae are granting new insight into the as-yet uncertain mechanism that drives successful explosions. While there is still debate about whether explosions obtained more easily in 3D than 2D, it undeniable exist qualitative and quantitative differences between results 2D simulations. We present an extensive set high-resolution one-, two-, three-dimensional supernova with multispecies neutrino leakage carried out two different progenitors....

Abstract A hadron–quark phase transition (PT) may trigger supernova explosions during stellar core collapse. However, both success and failure have occurred in previous attempts to explode dying stars via this mechanism. We systematically explore the outcomes of PT-induced collapse mock proto-compact (PCSs) with a constant entropy lepton fraction, spherically symmetric general relativistic hydrodynamic simulations controlled series hybrid equations state. Our results reveal qualitative...

Monte Carlo approaches to radiation transport have several attractive properties such as simplicity of implementation, high accuracy, and good parallel scaling. Moreover, methods can handle complicated geometries are relatively easy extend multiple spatial dimensions, which makes them potentially interesting in modeling complex multi-dimensional astrophysical phenomena core-collapse supernovae. The aim this paper is explore for neutrino We generalize the Implicit photon scheme Fleck &...

We perform spherically-symmetric general-relativistic simulations of core collapse and the postbounce preexplosion phase in 32 presupernova stellar models solar metallicity with zero-age-main-sequence masses 12 M_{sun} to 120 M_{sun}. Using energy-dependent three-species neutrino transport two-moment approximation an analytic closure, we show that emitted luminosities spectra follow very systematic trends are correlated compactness (~M/R) progenitor star's inner regions via accretion rate...

We generate a second equation of state (EOS) nuclear matter for wide range temperatures, densities, and proton fractions use in supernovae, neutron star mergers, black hole formation simulations. employ full relativistic mean field (RMF) calculations at intermediate density high density, the virial expansion nonideal gas low density. For this EOS we RMF effective interaction FSUGold, whereas our earlier was based on NL3. The FSUGold has lower pressure densities compared to NL3 interaction....

We present results from a new set of 3D general-relativistic hydrodynamic simulations rotating iron core collapse. assume octant symmetry and focus on axisymmetric collapse, bounce, the early postbounce evolution, associated gravitational wave (GW) neutrino signals. employ finite-temperature nuclear equation state, parameterized electron capture in collapse phase, multi-species leakage scheme after bounce. The latter captures important effects deleptonization, cooling heating enables...

A weak-rate library aimed at investigating the sensitivity of astrophysical environments to variations electron-capture rates on medium-heavy nuclei has been developed. With this library, core-collapse and early post-bounce phases supernovae nuclear is examined by systematically statistically varying individual nuclei. The are adjusted factors consistent with uncertainties indicated comparing theoretical those deduced from charge-exchange $\beta$-decay measurements. To ensure a model...