Black holeneutron star mergers using a survey of finitetemperature equations of state
Abstract
Each of the potential signals from a black holeneutron star merger should contain an imprint of the neutron star equation of state: gravitational waves via its effect on tidal disruption, the kilonova via its effect on the ejecta, and the gammaray burst via its effect on the remnant disk. These effects have been studied by numerical simulations and quantified by semianalytic formulas. However, most of the simulations on which these formulas are based use equations of state without finite temperature and compositiondependent nuclear physics. In this paper, we simulate black holeneutron star mergers varying both the neutron star mass and the equation of state, using three finitetemperature nuclear models of varying stiffness. Our simulations largely vindicate formulas for ejecta properties but do not find the expected dependence of disk mass on neutron star compaction. We track the early evolution of the accretion disk, largely driven by shocking and fallback inflow, and do find notable equationofstate effects on the structure of this earlytime, neutrinobright disk.
 Publication:

Physical Review D
 Pub Date:
 September 2018
 DOI:
 10.1103/PhysRevD.98.063009
 arXiv:
 arXiv:1804.09823
 Bibcode:
 2018PhRvD..98f3009B
 Keywords:

 General Relativity and Quantum Cosmology;
 Astrophysics  High Energy Astrophysical Phenomena
 EPrint:
 10 pages, 11 figures, submitted to Phys. Rev. D