PoS - Proceedings of Science
Volume 426 - High Energy Astrophysics in Southern Africa 2022 (HEASA2022) - Agn ii
Estimation of orbital inclination angle for compact binary mergers
L. Mazwi*, S. Razzaque and L. Nyadzani
Full text: pdf
Pre-published on: October 03, 2023
Published on: December 27, 2023
The joint detection of gravitational wave (GW) event GW 170817 and the short-duration gamma-
ray burst (GRB) event GRB 170817A, marked the beginning of GW multi-messenger astronomy
and confirmed that binary neutron star mergers are progenitors of at least some short GRBs. An
estimated joint detection rate of 0.3 - 1.7 per year between the LIGO Hanford, LIGO Livingston and
Virgo GW network at design sensitivity, and the Fermi Gamma-ray Burst Monitor was predicted.
However, to date, GW 170817/GRB 170817A joint detection has been the only event of its kind
so far. Taking into the account that GRBs are narrowly beamed, we propose that previous mergers
involving neutron stars, were orientated such that observation of the emitted GRB along the narrow
jet was not possible. To support this hypothesis we aim to determine the inclination of previously
detected Binary Neutron Star and Black Hole Neutron Star mergers through GW analysis. Here
we present a preliminary analysis to estimate the orbital inclination parameter of GW 170817
based on different GW waveform models. Using only GW data, the inclination of the progenitor
system of GW 170817 was found to be ≈ 152◦ , in agreement with constraints on this value through
observations of GRB 170817A.
DOI: https://doi.org/10.22323/1.426.0013
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