A population study on the effect of metallicity on ZAMS to the merger

Sourav Roy Chowdhury, Deeptendu Santra

Published 2024-11-15Version 1

Multiband observations of compact object sources offer a unique opportunity to explore their progenitors and enhance early multi-messenger alert. Recent analyses have indicated that metallicity significantly impacts the evolution of progenitors and the resulting compact objects. Using binary population synthesis, we investigate the formation of eccentric, inspiralling black hole binaries and black hole-neutron star binaries through the isolated binary evolution channel. We introduced a fiducial mass and metallicity relation for each ZAMS star. We model the stellar cluster of ZAMS stars by extending COSMIC's publicly available code. Our BPS code effectively accounts for the metallicity of each stellar object in the stellar cluster. In our analysis, we observed a significant increase in the number of inspiral binaries remaining in the stellar cluster. Instead of assuming a uniform metallicity for a stellar cluster, ZAMS stars within the cluster, characterized by diverse metallicity, evolve into more massive compact objects. The total mass of a single binary black hole inspiral varies from $\sim 9-86$ M$_\odot$; whereas for a black hole-neutron star system, this range becomes $\sim 6-32$ M$_\odot$. We compare the detectability of the characteristic strain against sub-Hz gravitational wave detectors.