Systematics of prompt black-hole formation in neutron star mergers

Understand

This study addresses the collapse behavior of neutron star (NS) mergers expressed through the binary threshold mass M_thr for prompt black hole (BH) formation, which we determine by relativistic hydrodynamical simulations for 40 equation of state (EoS) models.

• M_thr can be well described by various fit formulae involving stellar parameters of nonrotating NSs.
• Using these relations we compute which constraints on NS radii and the tidal deformability are set by current and future merger detections revealing information about the merger product.
• We systematically investigate the impact of the binary mass ratio q=M_1/M_2 and assemble different fits, which make different assumptions about a-priori knowlegde.