The Impact of Stellar Compactness on Black Hole - Neutron Star Binary Mergers

Stellar disruption in black hole - neutron star mergers depends on the spin of the black hole, the mass ration of the system, and the compactness of the neutron star via its equation of state. In a previous study, we investiagted the effects of the stellar disruption on the gravitational wave emission as a function of the mass ratio for a stellar model with constant compactness. In the present study, we extend the study to investigate the effects from varying the compactness, paying attention to not only the gravitational wave emission but also to the dynamics of the apparent horizon of the black hole and its kick after the merger.