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  Magnetically driven winds from differentially rotating neutron stars and X-ray afterglows of short gamma-ray bursts

Siegel, D. M., Ciolfi, R., & Rezzolla, L. (2014). Magnetically driven winds from differentially rotating neutron stars and X-ray afterglows of short gamma-ray bursts. The Astrophysical Journal Letters, 785: L6. doi:10.1088/2041-8205/785/1/L6.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-001A-1140-2 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-001A-1142-D
Genre: Journal Article

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 Creators:
Siegel, Daniel M., Author
Ciolfi, Riccardo, Author
Rezzolla, Luciano1, Author              
Affiliations:
1Astrophysical Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, ou_24013              

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Free keywords: Astrophysics, High Energy Astrophysical Phenomena, astro-ph.HE, Astrophysics, Solar and Stellar Astrophysics, astro-ph.SR,General Relativity and Quantum Cosmology, gr-qc
 Abstract: Besides being among the most promising sources of gravitational waves, merging neutron star binaries also represent a leading scenario to explain the phenomenology of short gamma-ray bursts (SGRBs). Recent observations have revealed a large subclass of SGRBs with roughly constant luminosity in their X-ray afterglows, lasting $10\!-\!10^4$ s. These features are generally taken as evidence of a long-lived central engine powered by the magnetic spin-down of a uniformly rotating, magnetized object. We propose a different scenario in which the central engine powering the X-ray emission is a differentially rotating hypermassive neutron star (HMNS) that launches a quasi-isotropic and baryon-loaded wind driven by the magnetic field, which is built-up through differential rotation. Our model is supported by long-term, three-dimensional, general-relativistic, and ideal magnetohydrodynamic simulations, showing that this isotropic emission is a very robust feature. For a given HMNS, the presence of a collimated component depends sensitively on the initial magnetic field geometry, while the stationary electromagnetic luminosity depends only on the magnetic energy initially stored in the system. We show that our model is compatible with the observed timescales and luminosities and express the latter in terms of a simple scaling relation.

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 Dates: 2014-01-182014-04-102014
 Publication Status: Published in print
 Pages: 6 pages, 5 figures. Updated to match published article
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 Table of Contents: -
 Rev. Method: -
 Identifiers: arXiv: 1401.4544
DOI: 10.1088/2041-8205/785/1/L6
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Title: The Astrophysical Journal Letters
  Other : Astrophys. J. Lett.
Source Genre: Journal
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Publ. Info: Chicago, IL : University of Chicago Press for the American Astronomical Society
Pages: - Volume / Issue: 785 Sequence Number: L6 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: /journals/resource/954922828215