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Title: THE FATE OF THE COMPACT REMNANT IN NEUTRON STAR MERGERS

Neutron star (binary neutron star and neutron star–black hole) mergers are believed to produce short-duration gamma-ray bursts (GRBs). They are also believed to be the dominant source of gravitational waves to be detected by the advanced LIGO and advanced VIRGO and the dominant source of the heavy r-process elements in the universe. Whether or not these mergers produce short-duration GRBs depends sensitively on the fate of the core of the remnant (whether, and how quickly, it forms a black hole). In this paper, we combine the results of Newtonian merger calculations and equation of state studies to determine the fate of the cores of neutron star mergers. Using population studies, we can determine the distribution of these fates to compare to observations. We find that black hole cores form quickly only for equations of state that predict maximum non-rotating neutron star masses below 2.3–2.4 solar masses. If quick black hole formation is essential in producing GRBs, LIGO/Virgo observed rates compared to GRB rates could be used to constrain the equation of state for dense nuclear matter.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6]
  1. Department of Physics, The University of Arizona, Tucson, AZ 85721 (United States)
  2. Astronomical Observatory, University of Warsaw, Al Ujazdowskie 4, 00-478 Warsaw (Poland)
  3. Department of Astronomy and Astrophysics, University of California, Santa Cruz, CA 95064 (United States)
  4. The Oskar klein Center, Department of Astronomy, AlbaNova, Stockholm University, SE-106 91 Stockholm (Sweden)
  5. Institute for Nuclear Theory, University of Washington, Seattle, WA 98195 (United States)
  6. Department of Physics and Astronomy, University of Tennessee, Knoxville, TN 37996 (United States)
Publication Date:
OSTI Identifier:
22518864
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 812; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; BINARY STARS; BLACK HOLES; COMPARATIVE EVALUATIONS; COSMIC GAMMA BURSTS; EQUATIONS OF STATE; GRAVITATIONAL WAVES; NEUTRON STARS; NUCLEAR MATTER; R PROCESS; UNIVERSE