3D magnetized jet break-out from neutron-star binary merger ejecta: afterglow emission from the jet and the ejecta

Author:

Nathanail Antonios1,Gill Ramandeep23,Porth Oliver4,Fromm Christian M15,Rezzolla Luciano167

Affiliation:

1. Institut für Theoretische Physik, Goethe Universität Frankfurt, Max-von-Laue-Str.1, D-60438 Frankfurt am Main, Germany

2. Department of Physics, The George Washington University, Washington, DC 20052, USA

3. Department of Natural Sciences, The Open University of Israel, 1 University Road, PO Box 808, Raanana 4353701, Israel

4. Astronomical Institute Anton Pannekoek, Universeit van Amsterdam, Science Park 904, NL-1098 XH Amsterdam, the Netherlands

5. Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany

6. Helmholtz Research Academy Hesse for FAIR, Max-von-Laue-Str. 12, D-60438 Frankfurt am Main, Germany

7. School of Mathematics, Trinity College, Dublin 2, D02 PN40, Ireland

Abstract

ABSTRACT We perform 3D general-relativistic magnetohydrodynamic simulations to model the jet break-out from the ejecta expected to be produced in a binary neutron-star merger. The structure of the relativistic outflow from the 3D simulation confirms our previous results from 2D simulations, namely, that a relativistic magnetized outflow breaking out from the merger ejecta exhibits a hollow core of θcore ≈ 4°, an opening angle of θjet ≳ 10°, and is accompanied by a wind of ejected matter that will contribute to the kilonova emission. We also compute the non-thermal afterglow emission of the relativistic outflow and fit it to the panchromatic afterglow from GRB170817A, together with the superluminal motion reported from VLBI observations. In this way, we deduce an observer angle of $\theta _{\rm obs}= 35.7^{\circ \, \, +1.8}_{\phantom{\circ \, \, }-2.2}$. We further compute the afterglow emission from the ejected matter and constrain the parameter space for a scenario in which the matter responsible for the thermal kilonova emission will also lead to a non-thermal emission yet to be observed.

Funder

Iowa Science Foundation

National Natural Science Foundation of China

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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