Magnetic amplification in premerger neutron stars through resonance-induced magnetorotational instabilities
| Autor: | Suvorov, Arthur G., Kuan, Hao-Jui, Reboul-Salze, Alexis, Kokkotas, Kostas D. |
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| Rok vydání: | 2024 |
| Předmět: | |
| Zdroj: | Phys. Rev. D 109, 103023 (2024) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevD.109.103023 |
| Popis: | 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. Comment: 9 pages, 5 figures, 1 table. Minor changes to match journal style |
| Databáze: | arXiv |
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