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Title: The γ-rays that accompanied GW170817 and the observational signature of a magnetic jet breaking out of NS merger ejecta

Abstract

We present the first relativistic magnetohydrodynamics numerical simulation of a magnetic jet that propagates through and emerges from the dynamical ejecta of a binary neutron star merger. Generated by the magnetized rotation of the merger remnant, the jet propagates through the ejecta and produces an energetic cocoon that expands at mildly relativistic velocities and breaks out of the ejecta. We show that if the ejecta has a low-mass (∼10−7 M⊙) high-velocity (v ∼ 0.85c) tail, the cocoon shock breakout will generate γ-ray emission that is comparable to the observed short GRB170817A that accompanied the recent gravitational wave event GW170817. Thus, we propose that this gamma-ray burst (GRB), which is quite different from all other short GRBs observed before, was produced by a different mechanism. We expect, however, that such events are numerous and many will be detected in coming LIGO–Virgo runs.

Authors:
 [1];  [2];  [1];  [1]; ORCiD logo [3]
  1. The Raymond and Beverly Sackler School of Physics and Astronomy, Tel Aviv University, Tel Aviv 69978, Israel
  2. Center for Interdisciplinary Exploration & Research in Astrophysics (CIERA), Department of Physics & Astronomy, Northwestern University, Evanston, IL 60202, USA
  3. Racah Institute of Physics, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory-National Energy Research Scientific Computing Center
Sponsoring Org.:
USDOE
OSTI Identifier:
1526488
Resource Type:
Accepted Manuscript
Journal Name:
Monthly Notices of the Royal Astronomical Society
Additional Journal Information:
Journal Volume: 475; Journal Issue: 3; Journal ID: ISSN 0035-8711
Country of Publication:
United States
Language:
English

Citation Formats

Bromberg, O., Tchekhovskoy, A., Gottlieb, O., Nakar, E., and Piran, T. The γ-rays that accompanied GW170817 and the observational signature of a magnetic jet breaking out of NS merger ejecta. United States: N. p., 2017. Web. doi:10.1093/mnras/stx3316.
Bromberg, O., Tchekhovskoy, A., Gottlieb, O., Nakar, E., & Piran, T. The γ-rays that accompanied GW170817 and the observational signature of a magnetic jet breaking out of NS merger ejecta. United States. doi:10.1093/mnras/stx3316.
Bromberg, O., Tchekhovskoy, A., Gottlieb, O., Nakar, E., and Piran, T. Tue . "The γ-rays that accompanied GW170817 and the observational signature of a magnetic jet breaking out of NS merger ejecta". United States. doi:10.1093/mnras/stx3316. https://www.osti.gov/servlets/purl/1526488.
@article{osti_1526488,
title = {The γ-rays that accompanied GW170817 and the observational signature of a magnetic jet breaking out of NS merger ejecta},
author = {Bromberg, O. and Tchekhovskoy, A. and Gottlieb, O. and Nakar, E. and Piran, T.},
abstractNote = {We present the first relativistic magnetohydrodynamics numerical simulation of a magnetic jet that propagates through and emerges from the dynamical ejecta of a binary neutron star merger. Generated by the magnetized rotation of the merger remnant, the jet propagates through the ejecta and produces an energetic cocoon that expands at mildly relativistic velocities and breaks out of the ejecta. We show that if the ejecta has a low-mass (∼10−7 M⊙) high-velocity (v ∼ 0.85c) tail, the cocoon shock breakout will generate γ-ray emission that is comparable to the observed short GRB170817A that accompanied the recent gravitational wave event GW170817. Thus, we propose that this gamma-ray burst (GRB), which is quite different from all other short GRBs observed before, was produced by a different mechanism. We expect, however, that such events are numerous and many will be detected in coming LIGO–Virgo runs.},
doi = {10.1093/mnras/stx3316},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 3,
volume = 475,
place = {United States},
year = {2017},
month = {12}
}

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Cited by: 17 works
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