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arXiv · 2608.27555

A first-principles binary neutron star merger model of GW170817, GRB170817A, and AT2017gfo

Kenta Kiuchi·Sho Fujibayashi·Kota Hayashi·Kyohei Kawaguchi·Quentin Pognan·Alexis Reboul-Salze·Yuichiro Sekiguchi·Masaru Shibata·Shinya Wanajo
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Abstract

The multimessenger observation of the binary neutron star merger event GW170817, associated with its electromagnetic counterparts GRB170817A and AT2017gfo, marked a milestone in astrophysics, yet its unified physical explanation remains elusive. We conduct an end-to-end simulation based on a first-principles general-relativistic magnetohydrodynamics neutrino-radiation transfer merger simulation, followed by nucleosynthesis calculations and photon radiative transfer to generate kilonova light curves. We show that the large-scale dynamo simultaneously produces a relativistic jet with an isotropic-equivalent luminosity of $\sim 10^{51}~{\rm erg~s^{-1}}$ and $\approx 0.08M_\odot$ of neutron-rich ejecta, reproducing the GRB170817A afterglow and the AT2017gfo kilonova light curves. Our results establish a unified first-principles framework for interpreting binary neutron star mergers across gravitational wave, gamma-ray burst, and kilonova observations.

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Kenta Kiuchi, Sho Fujibayashi, Kota Hayashi, Kyohei Kawaguchi, Quentin Pognan, Alexis Reboul-Salze, Yuichiro Sekiguchi, Masaru Shibata, Shinya Wanajo. 2026-08-27. A first-principles binary neutron star merger model of GW170817, GRB170817A, and AT2017gfo. https://arxiv.org/abs/2608.27555

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