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Title: Properties of Neutrino-driven Ejecta from the Remnant of a Binary Neutron Star Merger: Pure Radiation Hydrodynamics Case

Abstract

We performed general relativistic, long-term, axisymmetric neutrino radiation hydrodynamics simulations for the remnant formed after a binary neutron star merger, which consists of a massive neutron star and a torus surrounding it. As an initial condition, we employ the result derived in a three-dimensional, numerical relativity simulation for the binary neutron star merger. We investigate the properties of neutrino-driven ejecta. Due to the pair-annihilation heating, the dynamics of the neutrino-driven ejecta are significantly modified. The kinetic energy of the ejecta is about two times larger than that in the absence of pair-annihilation heating. This suggests that the pair-annihilation heating plays an important role in the evolution of merger remnants. The relativistic outflow, which is required for driving gamma-ray bursts, is not observed because the specific heating rate around the rotational axis is not sufficiently high, due to the baryon loading caused by the neutrino-driven ejecta from the massive neutron star. We discuss the condition for launching the relativistic outflow and the nucleosynthesis in the ejecta.

Authors:
 [1];  [2]; ;  [3]
  1. Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8502 (Japan)
  2. Department of Physics, Toho University, Funabashi, Chiba 274-8510 (Japan)
  3. Center for Gravitational Physics, Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8502 (Japan)
Publication Date:
OSTI Identifier:
22679871
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 846; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ACCRETION DISKS; ANNIHILATION; AXIAL SYMMETRY; BINARY STARS; COSMIC GAMMA BURSTS; GAMMA RADIATION; HEATING RATE; HYDRODYNAMICS; KINETIC ENERGY; NEUTRINOS; NEUTRON STARS; NUCLEOSYNTHESIS; RELATIVISTIC RANGE; SIMULATION; STAR EVOLUTION; THREE-DIMENSIONAL CALCULATIONS

Citation Formats

Fujibayashi, Sho, Sekiguchi, Yuichiro, Kiuchi, Kenta, and Shibata, Masaru, E-mail: sho.fujibayashi@yukawa.kyoto-u.ac.jp. Properties of Neutrino-driven Ejecta from the Remnant of a Binary Neutron Star Merger: Pure Radiation Hydrodynamics Case. United States: N. p., 2017. Web. doi:10.3847/1538-4357/AA8039.
Fujibayashi, Sho, Sekiguchi, Yuichiro, Kiuchi, Kenta, & Shibata, Masaru, E-mail: sho.fujibayashi@yukawa.kyoto-u.ac.jp. Properties of Neutrino-driven Ejecta from the Remnant of a Binary Neutron Star Merger: Pure Radiation Hydrodynamics Case. United States. doi:10.3847/1538-4357/AA8039.
Fujibayashi, Sho, Sekiguchi, Yuichiro, Kiuchi, Kenta, and Shibata, Masaru, E-mail: sho.fujibayashi@yukawa.kyoto-u.ac.jp. Sun . "Properties of Neutrino-driven Ejecta from the Remnant of a Binary Neutron Star Merger: Pure Radiation Hydrodynamics Case". United States. doi:10.3847/1538-4357/AA8039.
@article{osti_22679871,
title = {Properties of Neutrino-driven Ejecta from the Remnant of a Binary Neutron Star Merger: Pure Radiation Hydrodynamics Case},
author = {Fujibayashi, Sho and Sekiguchi, Yuichiro and Kiuchi, Kenta and Shibata, Masaru, E-mail: sho.fujibayashi@yukawa.kyoto-u.ac.jp},
abstractNote = {We performed general relativistic, long-term, axisymmetric neutrino radiation hydrodynamics simulations for the remnant formed after a binary neutron star merger, which consists of a massive neutron star and a torus surrounding it. As an initial condition, we employ the result derived in a three-dimensional, numerical relativity simulation for the binary neutron star merger. We investigate the properties of neutrino-driven ejecta. Due to the pair-annihilation heating, the dynamics of the neutrino-driven ejecta are significantly modified. The kinetic energy of the ejecta is about two times larger than that in the absence of pair-annihilation heating. This suggests that the pair-annihilation heating plays an important role in the evolution of merger remnants. The relativistic outflow, which is required for driving gamma-ray bursts, is not observed because the specific heating rate around the rotational axis is not sufficiently high, due to the baryon loading caused by the neutrino-driven ejecta from the massive neutron star. We discuss the condition for launching the relativistic outflow and the nucleosynthesis in the ejecta.},
doi = {10.3847/1538-4357/AA8039},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 2,
volume = 846,
place = {United States},
year = {2017},
month = {9}
}