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Disc formation in the collapse of supramassive neutron stars
Stockholm University, Faculty of Science, Department of Astronomy. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
Stockholm University, Faculty of Science, Department of Astronomy. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
Number of Authors: 32018 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 480, no 4, p. 5272-5285Article in journal (Refereed) Published
Abstract [en]

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 its parameters, or possibly both. The most popular engine scenario, the merger of two neutron stars, has received support from the recent Fermi and INTEGRAL detection of a burst of gamma rays (GRB170817A) following the neutron star merger GW 170817, 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 disc. 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 disc forming configurations than earlier studies but we agree with the latter that none of these configurations is likely to produce a phenomenon that would be classified as an sGRB.

Place, publisher, year, edition, pages
2018. Vol. 480, no 4, p. 5272-5285
Keywords [en]
accretion discs, hydrodynamics, methods: numerical, gamma-ray burst: general, stars: neutron, stars: rotation
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:su:diva-162995DOI: 10.1093/mnras/sty2181ISI: 000449617100078OAI: oai:DiVA.org:su-162995DiVA, id: diva2:1270220
Available from: 2018-12-12 Created: 2018-12-12 Last updated: 2018-12-12Bibliographically approved

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Camelio, GiovanniRosswog, Stephan
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