Magnetic amplification in premerger neutron stars through resonance-induced magnetorotational instabilities
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| Main Authors: | , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866916247752409088 |
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| author | Suvorov, Arthur G. Kuan, Hao-Jui Reboul-Salze, Alexis Kokkotas, Kostas D. |
| author_facet | Suvorov, Arthur G. Kuan, Hao-Jui Reboul-Salze, Alexis Kokkotas, Kostas D. |
| contents | Tidal resonances in the final seconds of a binary neutron-star inspiral can excite oscillation modes in one or both of the constituents to large amplitudes. Under favorable circumstances, resonant pulsations can overstrain the stellar crust and unleash a torrent of magnetoelastic energy that manifests as a gamma-ray ``precursor flare.'' We show that for realistic, stratified stars rotating with a spin frequency of $\gtrsim30\,$Hz, the fundamental $g$ or its first overtone can also execute a differential rotation in the crust such that a magnetic field of strength $\gtrsim10^{13}\,$G is generated via magnetorotational instabilities. This may help to explain observed precursor rates and their luminosities. Premerger magnetic growth would also provide seed magnetic energy for the postmerger remnant. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2404_14529 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Magnetic amplification in premerger neutron stars through resonance-induced magnetorotational instabilities Suvorov, Arthur G. Kuan, Hao-Jui Reboul-Salze, Alexis Kokkotas, Kostas D. High Energy Astrophysical Phenomena General Relativity and Quantum Cosmology High Energy Physics - Theory Tidal resonances in the final seconds of a binary neutron-star inspiral can excite oscillation modes in one or both of the constituents to large amplitudes. Under favorable circumstances, resonant pulsations can overstrain the stellar crust and unleash a torrent of magnetoelastic energy that manifests as a gamma-ray ``precursor flare.'' We show that for realistic, stratified stars rotating with a spin frequency of $\gtrsim30\,$Hz, the fundamental $g$ or its first overtone can also execute a differential rotation in the crust such that a magnetic field of strength $\gtrsim10^{13}\,$G is generated via magnetorotational instabilities. This may help to explain observed precursor rates and their luminosities. Premerger magnetic growth would also provide seed magnetic energy for the postmerger remnant. |
| title | Magnetic amplification in premerger neutron stars through resonance-induced magnetorotational instabilities |
| topic | High Energy Astrophysical Phenomena General Relativity and Quantum Cosmology High Energy Physics - Theory |
| url | https://arxiv.org/abs/2404.14529 |