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  Evolution of the Magnetized, Neutrino-Cooled Accretion Disk in the Aftermath of a Black Hole Neutron Star Binary Merger

Nouri, F. H., Duez, M. D., Foucart, F., Deaton, M. B., Haas, R., Haddadi, M., et al. (2018). Evolution of the Magnetized, Neutrino-Cooled Accretion Disk in the Aftermath of a Black Hole Neutron Star Binary Merger. Physical Review D, 97: 083014. doi:10.1103/PhysRevD.97.083014.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-6A95-0 Version Permalink: http://hdl.handle.net/21.11116/0000-0002-F963-6
Genre: Journal Article

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 Creators:
Nouri, Fatemeh Hossein, Author
Duez, Matthew D., Author
Foucart, Francois, Author
Deaton, M. Brett, Author
Haas, Roland1, Author
Haddadi, Milad, Author
Kidder, Lawrence E., Author
Ott, Christian D., Author
Pfeiffer, Harald1, Author              
Scheel, Mark A., Author
Szilagyi, Bela, Author
Affiliations:
1Astrophysical and Cosmological Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, ou_1933290              

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Free keywords: Astrophysics, High Energy Astrophysical Phenomena, astro-ph.HE,General Relativity and Quantum Cosmology, gr-qc
 Abstract: Black hole-torus systems from compact binary mergers are possible engines for gamma-ray bursts (GRBs). During the early evolution of the post-merger remnant, the state of the torus is determined by a combination of neutrino cooling and magnetically-driven heating processes, so realistic models must include both effects. In this paper, we study the post-merger evolution of a magnetized black hole-neutron star binary system using the Spectral Einstein Code (SpEC) from an initial post-merger state provided by previous numerical relativity simulations. We use a finite-temperature nuclear equation of state and incorporate neutrino effects in a leakage approximation. To achieve the needed accuracy, we introduce improvements to SpEC's implementation of general-relativistic magnetohydrodynamics (MHD), including the use of cubed-sphere multipatch grids and an improved method for dealing with supersonic accretion flows where primitive variable recovery is difficult. We find that a seed magnetic field triggers a sustained source of heating, but its thermal effects are largely cancelled by the accretion and spreading of the torus from MHD-related angular momentum transport. The neutrino luminosity peaks at the start of the simulation, and then drops significantly over the first 20\,ms but in roughly the same way for magnetized and nonmagnetized disks. The heating rate and disk's luminosity decrease much more slowly thereafter. These features of the evolution are insensitive to grid structure and resolution, formulation of the MHD equations, and seed field strength, although turbulent effects are not fully converged

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 Dates: 2017-10-202018
 Publication Status: Published in print
 Pages: 17 pages, 18 figures
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 Table of Contents: -
 Rev. Method: -
 Identifiers: arXiv: 1710.07423
DOI: 10.1103/PhysRevD.97.083014
URI: http://arxiv.org/abs/1710.07423
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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: 083014 Start / End Page: - Identifier: ISSN: 0556-2821
CoNE: /journals/resource/111088197762258