Maximum mass of compact stars from gravitational wave events with finite-temperature equations of state

Sanika Khadkikar, Adriana R. Raduta, Micaela Oertel, and Armen Sedrakian
Phys. Rev. C 103, 055811 – Published 14 May 2021

Abstract

We conjecture and verify a set of relations between global parameters of hot and fast-rotating compact stars which do not depend on the equation of state, including a relation connecting the masses of the mass-shedding (Kepler) and static configurations. We apply these relations to the GW170817 event by adopting the scenario in which a hypermassive compact star remnant formed in a merger evolves into a supramassive compact star that collapses into a black hole once the stability line for such stars is crossed. We deduce an upper limit on the maximum mass of static, cold neutron stars 2.150.17+0.18MTOV/M2.240.44+0.45 for the typical range of entropy per baryon, 2S/A3, and electron fraction Ye=0.1 characterizing the hot hypermassive star. Our result implies that accounting for the finite temperature of the merger remnant relaxes previously derived constraints on the value of the maximum mass of a cold, static compact star.

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  • Received 2 February 2021
  • Accepted 2 April 2021

DOI:https://doi.org/10.1103/PhysRevC.103.055811

©2021 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

Sanika Khadkikar1,*, Adriana R. Raduta2,†, Micaela Oertel3,‡, and Armen Sedrakian4,5,§

  • 1Birla Institute of Technology Sciences, Pilani, Hyderabad Campus, Hyderabad 500078, India
  • 2National Institute for Physics and Nuclear Engineering (IFIN-HH), RO-077125 Bucharest, Romania
  • 3LUTH, Observatoire de Paris, Université PSL, CNRS, Université de Paris, 92190 Meudon, France
  • 4Frankfurt Institute for Advanced Studies, D-60438 Frankfurt-Main, Germany
  • 5Institute of Theoretical Physics, University of Wrocław, 50-204 Wrocław, Poland

  • *sanikakhadkikar@outlook.com
  • araduta@nipne.ro
  • micaela.oertel@obspm.fr
  • §sedrakian@fias.uni-frankfurt.de

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Vol. 103, Iss. 5 — May 2021

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