Merger of black hole-neutron star binaries: Nonspinning black hole case

We perform a simulation for merger of a black hole (BH)-neutron star (NS) binary in full general relativity preparing a quasicircular state as initial condition. The BH is modeled by a moving puncture with no spin and the NS by the Γ-law equation of state with Γ=2. Corotating velocity field is assumed for the NS. The mass of the BH and the rest-mass of the NS are chosen to be ≅3.2M· and ≅1.4M· with relatively large radius of the NS ≅14 km. The NS is tidally disrupted near the innermost stable orbit but ∼80% of the material is swallowed into the BH with small disk mass ∼0.3M· even for such small BH mass ∼3M·. The result indicates that the system of a BH and a massive disk of ∼M· is not formed from nonspinning BH-NS binaries, although a disk of mass ∼0.1M· is a possible outcome