English

# Item

ITEM ACTIONSEXPORT
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.

Item is

### Basic

show hide
Genre: Journal Article

### Files

show Files
hide Files
:
2202.13149.pdf (Preprint), 9MB
Name:
2202.13149.pdf
Description:
OA-Status:
Visibility:
Public
MIME-Type / Checksum:
application/pdf / [MD5]
-
-
:
Kawaguchi_2022_ApJ_933_22.pdf (Publisher version), 3MB
Name:
Kawaguchi_2022_ApJ_933_22.pdf
Description:
Open Access
OA-Status:
Visibility:
Public
MIME-Type / Checksum:
application/pdf / [MD5]
-
-

show

### Creators

show
hide
Creators:
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

### Content

show
hide
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.

### Details

show
hide
Language(s):
Dates: 2022-02-262022
Publication Status: Published in print
Pages: 23 pages, 12 figures, submitted to ApJ
Publishing info: -
Rev. Type: -
Identifiers: arXiv: 2202.13149
DOI: 10.3847/1538-4357/ac6ef7
Degree: -

show

show

show

### Source 1

show
hide
Title: The Astrophysical Journal
Source Genre: Journal
Creator(s):
Affiliations:
Publ. Info: -
Pages: - Volume / Issue: 933 (1) Sequence Number: 22 Start / End Page: - Identifier: -