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  Structure of Stable Binary Neutron Star Merger Remnants: Role of Initial Spin

Kastaun, W., Ciolfi, R., Endrizzi, A., & Giacomazzo, B. (2017). Structure of Stable Binary Neutron Star Merger Remnants: Role of Initial Spin. Physical Review D, 96: 043019. doi:10.1103/PhysRevD.96.043019.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-FE07-A Version Permalink: http://hdl.handle.net/21.11116/0000-0002-ED8F-3
Genre: Journal Article

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 Creators:
Kastaun, Wolfgang1, Author              
Ciolfi, Riccardo, Author
Endrizzi, Andrea, Author
Giacomazzo, Bruno, Author
Affiliations:
1Binary Merger Observations and Numerical Relativity, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, ou_2461691              

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Free keywords: Astrophysics, High Energy Astrophysical Phenomena, astro-ph.HE,General Relativity and Quantum Cosmology, gr-qc
 Abstract: We present general relativistic numerical simulations of binary neutron star (BNS) mergers with different initial spin configurations. We focus on models with stars of mass 1.4 M_sol each, which employ the equation of state (EOS) by Shen, Horowitz, and Teige, and which result in stable NSs as merger remnants. For comparison, we consider two irrotational equal mass (M=1.35 M_sol) and unequal mass (M=1.29,1.42 M_sol) BNS models using the APR4 EOS, which result in a supramassive merger remnant. We present visualizations of the fluid flow and temperature distribution and find a strong impact of the spin on vortex structure and nonaxisymmetric deformation. We compute the radial mass distribution and the rotation profile in the equatorial plane using recently developed measures independent of spatial gauge, revealing slowly rotating cores that can be well approximated by the cores of spherical stars. We also study the influence of the spin on the inspiral phase and the gravitational wave (GW) signal. Using a newly developed analysis method, we further show that gravitational waveforms from BNS mergers can exhibit one or more phase jumps after merger, which occur together with minima of the strain amplitude. We provide a natural explanation in terms of the remnant's quadrupole moment, and show that cancellation effects due to phase jumps can have a strong impact on the GW power spectrum. Finally, we discuss the impact of the spin on the amount of ejected matter.

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 Dates: 2016-12-122018-02-232017
 Publication Status: Published in print
 Pages: 20 pages, 21 figures; updated to published version
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 Table of Contents: -
 Rev. Method: -
 Identifiers: arXiv: 1612.03671
DOI: 10.1103/PhysRevD.96.043019
URI: http://arxiv.org/abs/1612.03671
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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: 96 Sequence Number: 043019 Start / End Page: - Identifier: ISSN: 0556-2821
CoNE: /journals/resource/111088197762258