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Event Detail Information

Astronomy Colloquium: "Variety in black hole-neutron star merger outcomes"

Speaker Matthew Duez, Washington State University
Date Nov 19, 2013
Time 4:00 pm - 5:00 pm  
Location Astronomy 134
Sponsor Department of Astronomy
Event type Colloquia
Views 7095
The outcome of a black hole-neutron star binary merger can depend on the the unknown details of the neutron star equation of state as well as the premerger masses and spins. Some of the nuclear matter can form a hot, neutrino-dominated accretion flow onto the black hole--an intrinsically interesting extreme of accretion physics and also a promising engine for a short-duration gamma ray burst. Meanwhile, the tidal tail and disk winds can produce outflows with their own interesting evolution and possibility for detection as a kilonova or radio afterglow. In this talk, I will present numerical simulations of black hole-neutron star binaries carried out with the Spectral Einstein Code (SpEC); simulations include general relativity, a nuclear theory-based equation of state, and approximate effects of neutrino radiation. We cover a range of binary types, but give most attention to moderate black hole mass, high black hole spin systems. We find that a wide variety of post-merger outcomes is possible, depending on the masses and spins: disk-dominated, ejecta-dominated, or mixed. The early accretion disk also can have a variety of behaviors and levels of neutrino luminosity. I will also remark on applications of our findings to the interpretation of future multi-messenger detections of these events.
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