Secular Outflows from Long-Lived Neutron Star Merger Remnants

Abstract

We study mass ejection from a binary neutron star merger producing a long-lived massive neutron star remnant with general-relativistic neutrino-radiation hydrodynamics simulations. In addition to outflows generated by shocks and tidal torques during and shortly after the merger, we observe the appearance of a wind driven by spiral density waves in the disk. This spiral-wave-driven outflow is predominantly located close to the disk orbital plane and have a broad distribution of electron fractions. At higher latitudes, a high electron-fraction wind is driven by neutrino radiation. The combined nucleosynthesis yields from all the ejecta components is in good agreement with Solar abundance measurements.

9 pages, 5 figures. Submitted to ASTRONUM2023 proceedings

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• Cocoon shock breakout emission from binary neutron star mergers
• Late-time non-thermal emission from mildly relativistic tidal ejecta of compact objects merger
• 2D End-to-End Modeling of Kilonovae from Binary Neutron Star Merger Remnants
• General relativistic hydrodynamics code for dynamical spacetimes with curvilinear coordinates, tabulated equations of state, and neutrino physics