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  Electromagnetic counterparts of binary neutron star mergers leading to a strongly magnetized long-lived remnant neutron star

Kawaguchi, K., Fujibayashi, S., Hotokezaka, K., Shibata, M., & Wanajo, S. (2022). Electromagnetic counterparts of binary neutron star mergers leading to a strongly magnetized long-lived remnant neutron star. The Astrophysical Journal, 933(1): 22. doi:10.3847/1538-4357/ac6ef7.

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Kawaguchi , Kyohei, Author
Fujibayashi, Sho1, Author           
Hotokezaka, Kenta, Author
Shibata, Masaru1, Author           
Wanajo, Shinya1, Author           
Affiliations:
1Computational Relativistic Astrophysics, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, ou_2541714              

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Free keywords: Astrophysics, High Energy Astrophysical Phenomena, astro-ph.HE,General Relativity and Quantum Cosmology, gr-qc
 Abstract: We explore the electromagnetic counterparts that will associate with binary neutron star mergers for the case that remnant massive neutron stars survive for $\gtrsim 0.5$ s after the merger. For this study, we employ the outflow profiles obtained by long-term general-relativistic neutrino-radiation magneto-hydrodynamics simulations with a mean field dynamo effect. We show that a synchrotron afterglow with high luminosity can be associated with the merger event if the magnetic fields of the remnant neutron stars are significantly amplified by the dynamo effect. We also perform a radiative transfer calculation for kilonovae and find that for the highly amplified magnetic field cases, the kilonovae can be bright in the early epoch ($t\leq 0.5\,{\rm d}$), while it shows rapid declining ($\lesssim 1\,{\rm d}$) emission and long-lasting ($\sim 10\,{\rm d}$) emission in the optical and near-infrared wavelength, respectively. All these features have not been found in GW170817, indicating that the merger remnant neutron star formed in GW170817 might have collapsed to a black hole within several hundreds ms or magnetic-field amplification might be a minor effect.

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 Dates: 2022-02-262022
 Publication Status: Published in print
 Pages: 23 pages, 12 figures, submitted to ApJ
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 Rev. Type: -
 Identifiers: arXiv: 2202.13149
DOI: 10.3847/1538-4357/ac6ef7
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Title: The Astrophysical Journal
Source Genre: Journal
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Pages: - Volume / Issue: 933 (1) Sequence Number: 22 Start / End Page: - Identifier: -