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#### Properties of the remnant disk and the dynamical ejecta produced in low-mass black hole-neutron star mergers

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2010.02563.pdf

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##### Citation

Hayashi, K., Kawaguchi, K., Kiuchi, K., Kyutoku, K., & Shibata, M. (2021). Properties
of the remnant disk and the dynamical ejecta produced in low-mass black hole-neutron star mergers.*
Physical Review D,* *103*(4): 043007. doi:10.1103/PhysRevD.103.043007.

Cite as: https://hdl.handle.net/21.11116/0000-0008-16CC-A

##### Abstract

We systematically perform numerical-relativity simulations for low-mass black

hole-neutron star mergers for the models with seven mass ratios $Q=M_{\rm

BH}/M_{\rm NS}$ ranging from 1.5 to 4.4, and three neutron-star equations of

state, focusing on properties of matter remaining outside the black hole and

ejected dynamically during the merger. We pay particular attention to the

dependence on the mass ratio of the binaries. It is found that the rest mass

remaining outside the apparent horizon after the merger depends only weakly on

the mass ratio for the models with low mass ratios. It is also clarified that

the rest mass of the ejecta has a peak at $Q \sim 3$, and decreases steeply as

the mass ratio decreases for the low mass-ratio case. We present a novel

analysis method for the behavior of matter during the merger, focusing on the

matter distribution in the phase space of specific energy and specific angular

momentum. Then we model the matter distribution during and after the merger.

Using the result of the analysis, we discuss the properties of the ejecta.

hole-neutron star mergers for the models with seven mass ratios $Q=M_{\rm

BH}/M_{\rm NS}$ ranging from 1.5 to 4.4, and three neutron-star equations of

state, focusing on properties of matter remaining outside the black hole and

ejected dynamically during the merger. We pay particular attention to the

dependence on the mass ratio of the binaries. It is found that the rest mass

remaining outside the apparent horizon after the merger depends only weakly on

the mass ratio for the models with low mass ratios. It is also clarified that

the rest mass of the ejecta has a peak at $Q \sim 3$, and decreases steeply as

the mass ratio decreases for the low mass-ratio case. We present a novel

analysis method for the behavior of matter during the merger, focusing on the

matter distribution in the phase space of specific energy and specific angular

momentum. Then we model the matter distribution during and after the merger.

Using the result of the analysis, we discuss the properties of the ejecta.