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• W2023247214 abstract "We explore the evolution of the different ejecta components generated during the merger of a neutron star and a black hole. Our focus is the interplay between material ejected dynamically during the merger, and the wind launched on a viscous time-scale by the remnant accretion disc. These components are expected to contribute to an electromagnetic transient and to produce r-process elements, each with a different signature when considered separately. Here we introduce a two-step approach to investigate their combined evolution, using two- and three-dimensional hydrodynamic simulations. Starting from the output of a merger simulation, we identify each component in the initial condition based on its phase-space distribution, and evolve the accretion disc in axisymmetry. The wind blown from this disc is injected into a three-dimensional computational domain where the dynamical ejecta is evolved. We find that the wind can suppress fallback accretion on time-scales longer than ∼100 ms. Because of self-similar viscous evolution, the disc accretion at late times nevertheless approaches a power-law time dependence ∝t−2.2. This can power some late-time gamma-ray burst engine activity, although the available energy is significantly less than in traditional fallback models. Inclusion of radioactive heating due to the r-process does not significantly affect the fallback accretion rate or the disc wind. We do not find any significant modification to the wind properties at large radius due to interaction with the dynamical ejecta. This is a consequence of the different expansion velocities of the two components." @default.
• W2023247214 created "2016-06-24" @default.
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• W2023247214 date "2015-03-17" @default.
• W2023247214 modified "2023-10-16" @default.
• W2023247214 title "The interplay of disc wind and dynamical ejecta in the aftermath of neutron star–black hole mergers" @default.
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• W2023247214 doi "https://doi.org/10.1093/mnras/stv238" @default.
• W2023247214 hasPublicationYear "2015" @default.
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