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.
9 pages, 5 figures, 1 table. Minor changes to match journal style
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