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- W2234367346 abstract "We present fully general-relativistic simulations of binary neutron star mergers with a temperature and composition dependent nuclear equation of state. We study the dynamical mass ejection from both quasi-circular and dynamical-capture eccentric mergers. We systematically vary the level of our treatment of the microphysics to isolate the effects of neutrino cooling and heating and we compute the nucleosynthetic yields of the ejecta. We find that eccentric binaries can eject significantly more material than quasi-circular binaries and generate bright infrared and radio emission. In all our simulations the outflow is composed of a combination of tidally- and shock-driven ejecta, mostly distributed over a broad $sim 60^circ$ angle from the orbital plane, and, to a lesser extent, by thermally driven winds at high latitudes. Ejecta from eccentric mergers are typically more neutron rich than those of quasi-circular mergers. We find neutrino cooling and heating to affect, quantitatively and qualitatively, composition, morphology, and total mass of the outflows. This is also reflected in the infrared and radio signatures of the binary. The final nucleosynthetic yields of the ejecta are robust and insensitive to input physics or merger type in the regions of the second and third r-process peaks. The yields for elements on the first peak vary between our simulations, but none of our models is able to explain the Solar abundances of first-peak elements without invoking additional first-peak contributions from either neutrino and viscously-driven winds operating on longer timescales after the mergers, or from core-collapse supernovae." @default.
- W2234367346 created "2016-06-24" @default.
- W2234367346 creator A5023916231 @default.
- W2234367346 creator A5034731703 @default.
- W2234367346 creator A5035099411 @default.
- W2234367346 creator A5035738397 @default.
- W2234367346 creator A5042137136 @default.
- W2234367346 creator A5074965543 @default.
- W2234367346 date "2016-05-23" @default.
- W2234367346 modified "2023-10-17" @default.
- W2234367346 title "Dynamical mass ejection from binary neutron star mergers" @default.
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