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- W3155514044 abstract "The merger of two neutron stars or of a neutron star and a black hole typically results in the formation of a post-merger accretion disk. Outflows from disks may dominate the overall ejecta from mergers and be a major source of r-process nuclei in our universe. We explore the parameter space of such disks, their outflows, and r-process yields by performing three-dimensional general-relativistic magnetohydrodynamic (GRMHD) simulations with weak interactions and approximate neutrino transport. We discuss the mapping between initial binary parameters and the parameter space of resulting disks, chiefly characterized by their initial accretion rate. We demonstrate the existence of an ignition threshold for weak interactions at around $sim 10^{-3} M_odotmathrm{s}^{-1}$ for typical parameters by means of analytic calculations within a 1D $alpha$-viscosity disk model and by explicit GRMHD simulations. Focusing on the qualitative change in disk physics across the ignition threshold, we find a degenerate, self-regulated, neutrino-cooled regime above the threshold and an advection dominated regime below the threshold. Excess heating in the absence of neutrino cooling below the threshold leads to $gtrsim 60$% of the initial disk mass being ejected in outflows, with typical velocities $sim (0.1-0.2)c$ in the model we simulate, compared to $lesssim 40$% at $sim (0.1-0.15)c$ above the threshold. While disks below the threshold show suppressed production of light r-process elements, disks above the threshold can produce the entire range of r-process elements in good agreement with the observed solar system abundances. Disks below the ignition threshold may produce an overabundance of actinides seen in actinide-boost stars. As gravitational-wave detectors start to sample the neutron-star merger parameter space, different disk realizations may be observable via their associated kilonova emission." @default.
- W3155514044 created "2021-04-26" @default.
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- W3155514044 date "2021-04-18" @default.
- W3155514044 modified "2023-09-26" @default.
- W3155514044 title "Igniting weak interactions in neutron-star post-merger accretion disks" @default.
- W3155514044 hasPublicationYear "2021" @default.
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