Inferring prompt blackhole formation in neutron star mergers from gravitationalwave data
Abstract
The gravitational wave GW170817 is associated with the inspiral phase of a binary neutron star coalescence event. The LIGOVirgo detectors' sensitivity at high frequencies was not sufficient to detect the signal corresponding to the merger and postmerger phases. Hence, the question whether the merger outcome was a prompt blackhole formation or not must be answered using either the premerger gravitationalwave signal or electromagnetic counterparts. In this work we present two methods to infer the probability of prompt blackhole formation, using the analysis of the inspiral gravitationalwave signal. Both methods combine the posterior distribution from the gravitationalwave data analysis with numericalrelativity results. One method relies on the use of phenomenological models for the equation of state and on the estimate of the collapse threshold mass. The other is based on the estimate of the tidal polarizability parameter Λ ∼ that is correlated in an equationofstate agnostic way with the prompt blackhole formation. We analyze GW170817 data and find that the two methods consistently predict a probability of ∼50 % 70 % for prompt blackhole formation, which however may significantly decrease below 10% if the maximum mass constraint from PSR J0348+0432 or PSR J0740+6620 is imposed.
 Publication:

Physical Review D
 Pub Date:
 February 2020
 DOI:
 10.1103/PhysRevD.101.044006
 arXiv:
 arXiv:1908.05442
 Bibcode:
 2020PhRvD.101d4006A
 Keywords:

 General Relativity and Quantum Cosmology;
 Astrophysics  High Energy Astrophysical Phenomena
 EPrint:
 14 pages, 14 figures