Current browse context:
hep-th
Change to browse by:
References & Citations
Astrophysics > High Energy Astrophysical Phenomena
Title: Magnetic amplification in premerger neutron stars through resonance-induced magnetorotational instabilities
(Submitted on 22 Apr 2024 (v1), last revised 15 May 2024 (this version, v2))
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 $\gtrsim30\,$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.
Submission history
From: Arthur Suvorov Dr. [view email][v1] Mon, 22 Apr 2024 18:57:39 GMT (207kb,D)
[v2] Wed, 15 May 2024 16:43:07 GMT (207kb,D)
Link back to: arXiv, form interface, contact.