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  Electromagnetic emission from long-lived binary neutron star merger remnants II: lightcurves and spectra

Siegel, D., & Ciolfi, R. (2016). Electromagnetic emission from long-lived binary neutron star merger remnants II: lightcurves and spectra. The Astrophysical Journal, 819: 15. doi:10.3847/0004-637X/819/1/15.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002B-006D-D Version Permalink: http://hdl.handle.net/21.11116/0000-0002-FA13-F
Genre: Journal Article

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1508.07939.pdf (Preprint), 9MB
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Siegel, Daniel1, Author              
Ciolfi, Riccardo1, 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, Astrophysics, Solar and Stellar Astrophysics, astro-ph.SR,General Relativity and Quantum Cosmology, gr-qc
 Abstract: Recent observations indicate that in a large fraction of binary neutron star (BNS) mergers a long-lived neutron star (NS) may be formed rather than a black hole. Unambiguous electromagnetic (EM) signatures of such a scenario would strongly impact our knowledge on how short gamma-ray bursts (SGRBs) and their afterglow radiation are generated. Furthermore, such EM signals would have profound implications for multimessenger astronomy with joint EM and gravitational-wave (GW) observations of BNS mergers, which will soon become reality with the ground-based advanced LIGO/Virgo GW detector network starting its first science run this year. Here we explore such EM signatures based on the model presented in a companion paper, which provides a self-consistent evolution of the post-merger system and its EM emission starting from an early baryonic wind phase and resulting in a final pulsar wind nebula that is confined by the previously ejected material. Lightcurves and spectra are computed for a wide range of post-merger physical properties and particular attention is paid to the emission in the X-ray band. In the context of SGRB afterglow modeling, we present X-ray lightcurves corresponding to the 'standard' and the recently proposed 'time-reversal' scenario (SGRB prompt emission produced at the time of merger or at the time of collapse of the long-lived NS). The resulting afterglow lightcurve morphologies include, in particular, single and two-plateau features with timescales and luminosities that are in good agreement with the observations by the Swift satellite. Furthermore, we compute the X-ray signal that should precede the SGRB in the time-reversal scenario. If found, such a signal would represent smoking-gun evidence for this scenario. Finally, we find a bright, highly isotropic EM transient signal peaking in the X-ray band ...

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 Dates: 2015-08-312016
 Publication Status: Published in print
 Pages: 20 pages, 16 figures
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: arXiv: 1508.07939
DOI: 10.3847/0004-637X/819/1/15
URI: http://arxiv.org/abs/1508.07939
 Degree: -

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Title: The Astrophysical Journal
Source Genre: Journal
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Publ. Info: Chicago, IL : University of Chicago Press for the American Astronomical Society
Pages: - Volume / Issue: 819 Sequence Number: 15 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: /journals/resource/954922828215_3