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Jets from neutron-star merger remnants and massive blue kilonovae

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arxiv 2303.12284 v2 pith:SLCMNNRH submitted 2023-03-22 astro-ph.HE gr-qc

Luciano Combi , Daniel M. Siegel This is my paper · ORCID
classification astro-ph.HEgr-qc
keywords lesssimejectamergerneutronpost-mergerblueconsistentdemonstrate
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abstract

We perform high-resolution three-dimensional general-relativistic magnetohydrodynamic simulations with neutrino transport of binary neutron star (BNS) mergers resulting in a long-lived remnant neutron star, with properties typical of galactic BNS and consistent with those inferred for the first observed BNS merger GW170817. We demonstrate self-consistently that within $\lesssim\!30$ ms post-merger magnetized ($\sigma\sim 5-10$) twin polar jets emerge with asymptotic Lorentz factor $\Gamma\sim 5-10$, which successfully break out from the merger debris within $\lesssim\!20$ ms. A fast ($v\lesssim 0.6c$), magnetized ($\sigma\sim 0.1$) wind surrounds the jet core and generates a UV/blue kilonova precursor on timescales of hours, similar to the precursor signal due to free neutron decay in fast dynamical ejecta. Post-merger ejecta are quickly dominated by MHD-driven outflows from an accretion disk. We demonstrate that within only 50 ms post-merger, $\gtrsim 2\times 10^{-2}M_\odot$ of lanthanide-free, quasi-spherical ejecta with velocity $\sim\!0.1c$ is launched, yielding a kilonova signal consistent with GW170817 on timescales of $\lesssim\!5$\,d.

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Cited by 5 Pith papers

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    astro-ph.HE 2026-07 conditional novelty 6.0 of 10

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  4. Magnetic Field Configurations in Binary Neutron Star Mergers II: Inspiral, Merger and Ejecta

    astro-ph.HE 2025-08 conditional novelty 6.0 of 10

    Initial magnetic field topology, especially anti-aligned poloidal fields, strongly controls post-merger field amplification and ejecta magnetisation in neutron star merger simulations.

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