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Global simulations of strongly magnetized remnant massive neutron stars formed in binary neutron star mergers

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arxiv 1710.01311 v2 pith:RW5STCBG submitted 2017-10-03 astro-ph.HE astro-ph.COastro-ph.SRgr-qc

classification astro-ph.HEastro-ph.COastro-ph.SRgr-qc
keywords neutronresolutiongridrmnsstarapproxbinaryenergy
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

We perform a general-relativistic magnetohydrodynamics simulation for $\approx 30$ ms after merger of a binary neutron star to a remnant massive neutron star (RMNS) with a high spatial resolution of the finest grid resolution $12.5$ m. First, we estimate that the Kelvin-Helmholtz instability at merger could amplify the magnetic-field energy up to $\sim 1\%$ of the thermal energy. Second, we find that the magnetorotational instability in the RMNS envelope and torus with $\rho < 10^{13}~{\rm g~cm^{-3}}$ sustains magneto-turbulent state and the effective viscous parameter in these regions is likely to converge to $\approx 0.01$--$0.02$ with respect to the grid resolution. Third, the current grid resolution is not still fine enough to sustain magneto-turbulent state in the RMNS with $\rho \ge 10^{13}~{\rm g~cm^{-3}}$.

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Forward citations

Cited by 6 Pith papers

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