High resolution numerical relativity simulations for the merger of binary magnetized neutron stars

Kenta Kiuchi, Koutarou Kyutoku, Yuichiro Sekiguchi, Masaru Shibata, Tomohide Wada

    Research output: Contribution to journalArticlepeer-review

    124 Citations (Scopus)

    Abstract

    We perform high-resolution magnetohydrodynamics simulations of binary neutron star mergers in numerical relativity on the Japanese supercomputer K. The neutron stars and merger remnants are covered by a grid spacing of 70 m, which yields the highest-resolution results among those derived so far. By an in-depth resolution study, we clarify several amplification mechanisms of magnetic fields during the binary neutron star merger for the first time. First, the Kelvin-Helmholtz instability developed in the shear layer at the onset of the merger significantly amplifies the magnetic fields. A hypermassive neutron star (HMNS) formed after the merger is then subject to the nonaxisymmetric magnetorotational instability, which amplifies the magnetic field in the HMNS. These two amplification mechanisms cannot be found with insufficient-resolution runs. We also show that the HMNS eventually collapses to a black hole surrounded by an accretion torus which is strongly magnetized at birth.

    Original languageEnglish
    Article number041502
    JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
    Volume90
    Issue number4
    DOIs
    Publication statusPublished - 2014 Aug 28

    ASJC Scopus subject areas

    • Nuclear and High Energy Physics
    • Physics and Astronomy (miscellaneous)

    Fingerprint

    Dive into the research topics of 'High resolution numerical relativity simulations for the merger of binary magnetized neutron stars'. Together they form a unique fingerprint.

    Cite this