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      Disk formation in the collapse of supramassive neutron stars

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          Abstract

          Short gamma-ray bursts (sGRBs) show a large diversity in their properties. This suggests that the observed phenomenon can be caused by different "central engines" or that the engine produces a variety of outcomes depending on the specific system parameters, or possibly both. The most popular engine scenario, the merger of two neutron stars, has received support from the recent Fermi detection of a burst of gamma rays (GRB170817A) following the neutron star merger GW170817, but at the moment it is not clear how peculiar this event potentially was. Several sGRBs engine models involve the collapse of a supramassive neutron star that produces a black hole plus an accretion disk. We study this scenario for a variety of equations of states both via angular momentum considerations based on equilibrium models and via fully dynamical Numerical Relativity simulations. We obtain a broader range of disk forming configurations than earlier studies but, in agreement with the latter, we find that none of these configurations is likely to produce a phenomenon that would be classified as an sGRB.

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          Author and article information

          Journal
          20 June 2018
          Article
          1806.07775
          a939baa0-9be9-4f82-90a1-c9eddbb728a5

          http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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          Custom metadata
          submitted to MNRAS
          astro-ph.HE gr-qc

          General relativity & Quantum cosmology,High energy astrophysical phenomena

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