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Astrophysics > High Energy Astrophysical Phenomena
Title: Magnetic amplification in pre-merger neutron stars through resonance-induced magnetorotational instabilities
(Submitted on 22 Apr 2024)
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 $\gtrsim 30\,$Hz, the fundamental $g$-mode or its first overtone can also execute a differential rotation in the crust such that a magnetic field of strength $\gtrsim 10^{13}\,$G is generated via magnetorotational instabilities. This may help to explain observed precursor rates and their luminosities. Pre-merger magnetic growth would also provide seed magnetic energy for the post-merger remnant.
Submission history
From: Arthur Suvorov Dr. [view email][v1] Mon, 22 Apr 2024 18:57:39 GMT (207kb,D)
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