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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 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Curvature of optimal transport with respect to the cost and applications to inverse optimal transport

    math.OC 2026-04 unverdicted novelty 7.0 of 10

    With smooth positive marginals, the second variation of continuous OT in the cost is non-degenerate modulo invariances, giving local identifiability of inverse OT and unique recovery for bilinear costs under a spannin...

  2. Late-time emission-line profiles from kilonova models

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

    Late-time optically-thin kilonova line profiles computed from 2D long-term merger ejecta are complex, orientation-dependent and broadened by r-process heating, encoding ejecta structure.

  3. nmma: An extended Bayesian framework for Nuclear Multimessenger Astronomy in the Era of Next-Generation Detectors

    astro-ph.IM 2026-07 accept novelty 6.0 of 10

    nmma now jointly samples nuclear EoS parameters with GW and EM data via TOV emulators and Fiesta surrogates, delivering 20–60× speedups and future H0–nuclear constraints.

  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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