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Consequences of Jet-Ejecta Interaction in Neutron Star Mergers

Published online by Cambridge University Press:  27 February 2023

Lorenzo Nativi Open the ORCID record for Lorenzo Nativi [Opens in a new window] ,
Stephan Rosswog Open the ORCID record for Stephan Rosswog [Opens in a new window] ,
Mattia Bulla Open the ORCID record for Mattia Bulla [Opens in a new window] ,
Christoffer Lundman ,
Gavin P. Lamb  and
Grzegorz Kowal
Lorenzo Nativi
Affiliation:
Dept. of Astronomy and Oskar Klein Centre, Stockholm University, Stockholm, Sweden
Stephan Rosswog
Affiliation:
Dept. of Astronomy and Oskar Klein Centre, Stockholm University, Stockholm, Sweden
Mattia Bulla
Affiliation:
Dept. of Astronomy and Oskar Klein Centre, Stockholm University, Stockholm, Sweden
Christoffer Lundman
Affiliation:
Dept. of Astronomy and Oskar Klein Centre, Stockholm University, Stockholm, Sweden
Gavin P. Lamb
Affiliation:
Dept. of Physics and Astronomy, University of Leicester, Leicester, UK
Grzegorz Kowal
Affiliation:
Escola de Artes, Ciências e Humanidades, Universidade de São Paulo, São Paulo, Brazil email: lorenzo.nativi@astro.su.se
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Abstract

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In the first observed neutron star merger, GW170817, two dynamical components, mildly- and ultra-relativistic outflows were detected independently. The first component triggered a rapidly evolving thermal transient named macronova (kilonova), while the second caused an observed short GRB where the early gamma-ray signal was followed by a multi-wavelength afterglow. These two distinct components are typically modelled independently and the observational consequences of their interplay are hardly explored. Here we summarize the results of 3D special-relativistic simulations that we have used to investigate the consequences of jet propagation through a realistic environment. We show how the presence of a jet can lead to the macronova being brighter and bluer for on-axis observers in the first few days. Then we show the consequences on the interaction on the shape of the emerging jet. Finally, we will discuss how small scale features in the emerging jet structure can impact the best-fit afterglow parameters.

Keywords

methods: numericalhydrodynamicsISM: jets and outflowsgamma rays: bursts
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 16 , Symposium S363: Neutron Star Astrophysics at the Crossroads: Magnetars and the Multimessenger Revolution , June 2020 , pp. 245 - 249
Copyright
© The Author(s), 2023. Published by Cambridge University Press on behalf of International Astronomical Union

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