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Modeling GW170817 based on numerical relativity and its implications

Masaru Shibata1, Sho Fujibayashi1, Kenta Hotokezaka2,1, Kenta Kiuchi1, Koutarou Kyutoku3,1, Yuichiro Sekiguchi4,1, and Masaomi Tanaka5

  • 1Center for Gravitational Physics, Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8502, Japan
  • 2School of Natural Sciences, Institute for Advanced Study, Princeton, New Jersey 08540, USA
  • 3Theory Center, Institute of Particle and Nuclear Studies, KEK, Tsukuba 305-0801, Japan; Department of Particle and Nuclear Physics, the Graduate University for Advanced Studies (Sokendai), Tsukuba 305-0801, Japan; and Interdisciplinary Theoretical Science (iTHES) Research Group, RIKEN, Wako, Saitama 351-0198, Japan
  • 4Department of Physics, Toho University, Funabashi, Chiba 274-8510, Japan
  • 5National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588, Japan

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Phys. Rev. D 96, 123012 – Published 22 December, 2017

DOI: https://doi.org/10.1103/PhysRevD.96.123012

Abstract

Gravitational-wave observation together with a large number of electromagnetic observations shows that the source of the latest gravitational-wave event, GW170817, detected primarily by advanced LIGO, is the merger of a binary neutron star. We attempt to interpret this observational event based on our results of numerical-relativity simulations performed so far, paying particular attention to the optical and infrared observations. We finally reach a conclusion that this event is described consistently by the presence of a long-lived hypermassive or supramassive neutron star as the merger remnant because (i) significant contamination by lanthanide elements along our line of sight to this source can be avoided by the strong neutrino irradiation from it and (ii) it could play a crucial role in producing an ejecta component of appreciable mass with fast motion in the postmerger phase. We also point out that (I) the neutron-star equation of state has to be sufficiently stiff (i.e., the maximum mass of cold spherical neutron stars, Mmax, has to be appreciably higher than 2  M⊙) in order for a long-lived massive neutron star to be formed as the merger remnant for the binary systems of GW170817, for which the initial total mass is ≳2.73  M⊙, and (II) the absence of optical counterparts associated with relativistic ejecta suggests a not-extremely-high value of Mmax approximately as 2.15–2.25  M⊙.

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Phys. Rev. D 96, 123012– Published 22 December, 2017
  • Received 24 October 2017

© 2017 American Physical Society

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