High resolution magnetohydrodynamic simulation of black hole-neutron star merger: Mass ejection and short gamma ray bursts

• Kiuchi, Kenta

• Sekiguchi, Yuichiro

• Kyutoku, Koutarou

• Shibata, Masaru

• Taniguchi, Keisuke

• Wada, Tomohide

Abstract

We report results of a high resolution numerical-relativity simulation for the merger of black hole-magnetized neutron star binaries on Japanese supercomputer “K.” We focus on a binary that is subject to tidal disruption and subsequent formation of a massive accretion torus. We find the launch of thermally driven torus wind, subsequent formation of a funnel wall above the torus and a magnetosphere with collimated poloidal magnetic field, and high Blandford-Znajek luminosity. We show for the first time this picture in a self-consistent simulation. The turbulencelike motion induced by the nonaxisymmetric magnetorotational instability as well as the Kelvin-Helmholtz instability inside the accretion torus works as an agent to drive the mass accretion and converts the accretion energy to thermal energy, which results in the generation of a strong wind. By an in-depth resolution study, we reveal that high resolution is essential to draw such a picture. We also discuss the implication for the r-process nucleosynthesis, the radioactively powered transient emission, and short gamma ray bursts.

Journal

• Physical Review D

  Physical Review D 92 (6), 064034-, 2015-09-22

  American Physical Society

Keywords

• Nuclear and High Energy Physics

Details

• CRID: 1050001335818883712
• NII Article ID: 120005690189
• NII Book ID: AA00773624
• ISSN: 15507998
• ISSN: 15502368
• DOI: 10.1103/physrevd.92.064034
• HANDLE: 2433/203061
• Web Site: http://link.aps.org/article/10.1103/PhysRevD.92.064034
• Web Site: http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevD.92.064034/fulltext
• Text Lang: en
• Article Type: journal article
• Data Source:
  • IRDB
  • Crossref
  • CiNii Articles
  • KAKEN