A large-scale magnetic field produced by a solar-like dynamo in binary neutron star mergers
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| Main Authors: | , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866910333186080768 |
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| author | Kiuchi, Kenta Reboul-Salze, Alexis Shibata, Masaru Sekiguchi, Yuichiro |
| author_facet | Kiuchi, Kenta Reboul-Salze, Alexis Shibata, Masaru Sekiguchi, Yuichiro |
| contents | The merger of neutron stars drives a relativistic jet which can be observed as a short gamma-ray burst. A strong large-scale magnetic field is necessary to launch the relativistic jet. However, the magnetohydrodynamical mechanism to build up this magnetic field remains uncertain. Here we show that the $αΩ$ dynamo mechanism driven by the magnetorotational instability builds up the large-scale magnetic field inside the long-lived binary neutron star merger remnant by performing an {\it ab initio} super-high resolution neutrino-radiation magnetohydrodynamics merger simulation in full general relativity. As a result, the magnetic field induces the Poynting-flux dominated relativistic outflow with the luminosity $\sim 10^{51}$\,erg/s and magnetically-driven post-merger mass ejection with the mass $\sim 0.1M_\odot$. Therefore, the magnetar scenario in binary neutron star mergers is possible. These can be the engines of short-hard gamma-ray bursts and very bright kilonovae. Therefore, this scenario is testable in future observation. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2306_15721 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | A large-scale magnetic field produced by a solar-like dynamo in binary neutron star mergers Kiuchi, Kenta Reboul-Salze, Alexis Shibata, Masaru Sekiguchi, Yuichiro High Energy Astrophysical Phenomena General Relativity and Quantum Cosmology The merger of neutron stars drives a relativistic jet which can be observed as a short gamma-ray burst. A strong large-scale magnetic field is necessary to launch the relativistic jet. However, the magnetohydrodynamical mechanism to build up this magnetic field remains uncertain. Here we show that the $αΩ$ dynamo mechanism driven by the magnetorotational instability builds up the large-scale magnetic field inside the long-lived binary neutron star merger remnant by performing an {\it ab initio} super-high resolution neutrino-radiation magnetohydrodynamics merger simulation in full general relativity. As a result, the magnetic field induces the Poynting-flux dominated relativistic outflow with the luminosity $\sim 10^{51}$\,erg/s and magnetically-driven post-merger mass ejection with the mass $\sim 0.1M_\odot$. Therefore, the magnetar scenario in binary neutron star mergers is possible. These can be the engines of short-hard gamma-ray bursts and very bright kilonovae. Therefore, this scenario is testable in future observation. |
| title | A large-scale magnetic field produced by a solar-like dynamo in binary neutron star mergers |
| topic | High Energy Astrophysical Phenomena General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2306.15721 |