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

Kiuchi, K., Kyutoku, K., Sekiguchi, Y., & Shibata, M. (2018). Global simulations of strongly magnetized remnant massive neutron stars formed in binary neutron star mergers. Physical Review D, 97: 124039. doi:10.1103/PhysRevD.97.124039.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0003-572F-8 Version Permalink: http://hdl.handle.net/21.11116/0000-0003-5730-5
Genre: Journal Article

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 Creators:
Kiuchi, Kenta, Author
Kyutoku, Koutarou, Author
Sekiguchi, Yuichiro, Author
Shibata, Masaru1, 2, Author              
Affiliations:
1Computational Relativistic Astrophysics, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, ou_2541714              
2Center for Gravitational Physics, Yukawa Institute for Theoretical Physics, Kyoto University, ou_persistent22              

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Free keywords: Astrophysics, High Energy Astrophysical Phenomena, astro-ph.HE,Astrophysics, Cosmology and Extragalactic Astrophysics, astro-ph.CO, Astrophysics, Solar and Stellar Astrophysics, astro-ph.SR,General Relativity and Quantum Cosmology, gr-qc
 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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 Dates: 2017-10-032018-05-092018
 Publication Status: Published in print
 Pages: 18 pages, 10 figures, PRD in press
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: arXiv: 1710.01311
DOI: 10.1103/PhysRevD.97.124039
URI: http://arxiv.org/abs/1710.01311
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Title: Physical Review D
  Other : Phys. Rev. D.
Source Genre: Journal
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Publ. Info: Lancaster, Pa. : American Physical Society
Pages: - Volume / Issue: 97 Sequence Number: 124039 Start / End Page: - Identifier: ISSN: 0556-2821
CoNE: https://pure.mpg.de/cone/journals/resource/111088197762258