Exploring binary-neutron-star-merger scenario of short-gamma-ray bursts by gravitational-wave observation

TL;DR

This paper uses general relativistic simulations to analyze gravitational waves from binary neutron star mergers, revealing how GW spectra encode details about the merger dynamics, neutron star properties, and the formation of short gamma-ray burst engines.

Contribution

It demonstrates that GW spectra can constrain the formation mechanism of short gamma-ray burst central engines, linking GW features to merger physics and neutron star equations of state.

Findings

GW spectra reflect coalescence dynamics and neutron star properties

The formation of black hole and disk can be inferred from GW observations

GW features can constrain the neutron star equation of state

Abstract

We elucidate the feature of gravitational waves (GWs) from binary neutron star merger collapsing to a black hole by general relativistic simulation. We show that GW spectrum imprints the coalescence dynamics, formation process of disk, equation of state for neutron stars, total masses, and mass ratio. A formation mechanism of the central engine of short $\gamma$-ray bursts, which are likely to be composed of a black hole and surrounding disk, therefore could be constrained by GW observation.