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⁵⁶Ni production in long-lived binary neutron star merger remnants

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arxiv 2503.17445 v1 pith:ANNXGY6O submitted 2025-03-21 astro-ph.HE

$^{56}$Ni production in long-lived binary neutron star merger remnants

Maximilian Jacobi , Fabio Magistrelli , Eleonora Loffredo , Giacomo Ricigliano , Leonardo Chiesa , Sebastiano Bernuzzi , Albino Perego , Almudena Arcones This is my paper
classification astro-ph.HE
keywords mergerneutronstardayskilonovaremnantsimulationsbinary
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abstract

We investigate the nucleosynthesis and kilonova emission based on numerical-relativity binary neutron star merger simulations that incorporate a two-moment neutrino-transport scheme. Unlike in previous works with simpler neutrino treatments, a massive, fast (up to $v=0.3c$), proton-rich neutrino-driven wind develops in the post-merger phase of the simulations as long as the merger remnant does not collapse to a black hole. We evolve the ejecta for 100 days after the merger using 2D ray-by-ray radiation-hydrodynamics simulations coupled in-situ to a complete nuclear network. The most abundant nucleosynthesis products are He, $^{56}$Ni, and $^{56}$Co. We find a total yield of $\sim 10^{-3} M_\odot$ of $^{56}$Ni for all mergers that produce massive neutron star remnants, independently of the mass ratio and equation of state. After a few days, the decay of $^{56}$Ni and later $^{56}$Co becomes the primary source of heating in the matter expanding above the remnant. As a result, the kilonova light curve flattens on timescales of days for polar observation angles. The observation of this effect could serve as smoking gun for the presence of a long-lived neutron star remnant in future kilonova observations.

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Cited by 4 Pith papers

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