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

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

DOI: 10.1103/PHYSREVD.90.041502

关键词: Magnetorotational instabilityTheory of relativityAstrophysicsStellar black holeLIGOPhysicsNumerical relativityNeutron starAstronomyAccretion (astrophysics)X-ray binary

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

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