Magnetic amplification in premerger neutron stars through resonance-induced magnetorotational instabilities
arXiv:2404.14529 · doi:10.1103/PhysRevD.109.103023
Abstract
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 Hz, the fundamental or its first overtone can also execute a differential rotation in the crust such that a magnetic field of strength 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.
arXiv comment9 pages, 5 figures, 1 table. Minor changes to match journal style
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