Gravitational-Wave Luminosity of Binary Neutron Stars Mergers

Francesco Zappa, Sebastiano Bernuzzi, David Radice, Albino Perego, and Tim Dietrich
Phys. Rev. Lett. 120, 111101 – Published 15 March 2018

Abstract

We study the gravitational-wave peak luminosity and radiated energy of quasicircular neutron star mergers using a large sample of numerical relativity simulations with different binary parameters and input physics. The peak luminosity for all the binaries can be described in terms of the mass ratio and of the leading-order post-Newtonian tidal parameter solely. The mergers resulting in a prompt collapse to black hole have the largest peak luminosities. However, the largest amount of energy per unit mass is radiated by mergers that produce a hypermassive neutron star or a massive neutron star remnant. We quantify the gravitational-wave luminosity of binary neutron star merger events, and set upper limits on the radiated energy and the remnant angular momentum from these events. We find that there is an empirical universal relation connecting the total gravitational radiation and the angular momentum of the remnant. Our results constrain the final spin of the remnant black hole and also indicate that stable neutron star remnant forms with super-Keplerian angular momentum.

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  • Received 13 December 2017
  • Revised 30 January 2018

DOI:https://doi.org/10.1103/PhysRevLett.120.111101

© 2018 American Physical Society

Physics Subject Headings (PhySH)

Gravitation, Cosmology & Astrophysics

Authors & Affiliations

Francesco Zappa1, Sebastiano Bernuzzi1,2, David Radice3,4, Albino Perego2,1,5, and Tim Dietrich6,7

  • 1Dipartimento di Scienze Matematiche Fisiche ed Informatiche, Universitá di Parma, I-43124 Parma, Italia
  • 2Istituto Nazionale di Fisica Nucleare, Sezione Milano Bicocca, gruppo collegato di Parma, I-43124 Parma, Italia
  • 3Institute for Advanced Study, 1 Einstein Drive, Princeton, New Jersey 08540, USA
  • 4Department of Astrophysical Sciences, Princeton University, 4 Ivy Lane, Princeton, New Jersey 08544, USA
  • 5Dipartimento di Fisica, Università degli Studi di Milano Bicocca, Piazza della Scienza 3, 20126 Milano, Italia
  • 6Max Planck Institute for Gravitational Physics, Albert Einstein Institute, Am Mühlenberg 1, Potsdam-Golm 14476, Germany
  • 7Nikhef, Science Park 105, 1098 XG Amsterdam, Netherlands

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Issue

Vol. 120, Iss. 11 — 16 March 2018

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