Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc..968..297s&link_type=abstract
ASTROPHYSICS OF COMPACT OBJECTS: International Conference on Astrophysics of Compact Objects. AIP Conference Proceedings, Volum
Astronomy and Astrophysics
Astrophysics
Black Holes, Neutron Stars, Relativity And Gravitation, Gamma-Ray Sources, Gamma-Ray Bursts
Scientific paper
Some of the latest results of the simulation for the merger of black hole (BH)-neutron star (NS) binaries in full general relativity is presented. As the initial condition, we prepare a quasicircular state in which the BH is modeled by a moving puncture with no spin. The Γ-law equation of state with Γ = 2 and irrotational velocity field are used for modeling the NS. The BH mass is chosen to be ~4 Msolar, whereas the rest-mass of the NS is ~1.4 Msolar and the radius is ~13 km. The NS is tidally disrupted near the innermost stable orbit but more than ~90% of the material is quickly swallowed into the BH and the resultant disk mass is ~0.1 Msolar. The thermal energy of the material in the disk increases by the shock heating occurred in the collision between the spiral arms. Our results indicate that the merger between a low-mass BH and its companion NS may form a central engine of short-gamma-ray bursts. Gravitational waveforms are also presented. We find that the amplitude of gravitational waves quickly decreases after the tidal disruption and the amplitude of the quasinormal mode ringing is small.
Shibata Masaru
Taniguchi Keisuke
Uryu Koji
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