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Recoil Velocity of Binary Neutron Star Merger Remnants

Published online by Cambridge University Press:  27 February 2023

Sumeet Kulkarni Open the ORCID record for Sumeet Kulkarni [Opens in a new window] ,
Surendra Padamata  and
Anuradha Gupta
Sumeet Kulkarni
Affiliation:
Department of Physics & Astronomy, University of Mississippi, University, MS 38677, USA email: sskulkar@go.olemiss.edu
Surendra Padamata
Affiliation:
Institute for Gravitation and the Cosmos, Department of Physics, Pennsylvania State University, University Park, PA, 16802, USA
Anuradha Gupta
Affiliation:
Department of Physics & Astronomy, University of Mississippi, University, MS 38677, USA email: sskulkar@go.olemiss.edu
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Abstract

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The LIGO-Virgo gravitational wave detectors have confidently observed 4 events involving neutron stars: two binary neutron star (BNS) mergers (GW170817 and GW190425), and two neutron star-black hole mergers (GW200105 and GW200115). However, our theoretical understanding of the remnant properties of such systems is incomplete due to the complexities related to the modeling of matter effects and the very high computational cost of corresponding numerical relativity simulations. An important such property is the recoil velocity, which is imparted onto the remnant due to the anisotropic emission of gravitational radiation and the dynamical ejection of matter in the kilonova. In this work, we combine gravitational radiation as well as dynamical ejecta distributions, computed by the Computational Relativity numerical simulations, to get accurate estimates for BNS remnant recoil velocities. We find that recoils due to ejection of matter dominate those caused by gravitational wave emission. Knowledge of BNS remnant recoil velocities is important in determining if the remnant is retained by its environment for future hierarchical mergers which, in turn, can form binaries with black holes in the so-called lower mass gap of ∼ 3 – 5M⊙.

Keywords

Remnant propertiesRecoil velocityDynamical mergers
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. 250 - 254
Creative Commons
Creative Common License - CCCreative Common License - BY
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright
© The Author(s), 2023. Published by Cambridge University Press on behalf of International Astronomical Union

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