Einleitung

Weinberg, Manfred; Wutsdorff, Irina; Zbytovský, Štěpán

doi:10.14361/9783839441749-001

Cited by 1 publication

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“…However, g-modes (including torsional shear modes and interface modes [110]), which are perturbations restored by buoyancy or are otherwise supported by a fluid-to-solid transition, may also be important 7 in the precursor scenario, since they have typical frequencies 10 2 Hz in the co-rotating frame [111] (see also Ref. [112]) and can have non-trivial overlap integrals [10,29,33]. The g-mode frequencies are comparable with the r-mode frequencies for low rotation rates, and thus offer an alternate avenue for explaining multiple precursors from tidal resonances, i.e.…”

Section: Discussionmentioning

confidence: 99%

Precursor flares of short gamma-ray bursts from crust yielding due to tidal resonances in coalescing binaries of rotating, magnetized neutron stars

Suvorov

Kokkotas

2020

Phys. Rev. D

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As evidenced by the coincident detections of GW170817 and GRB 170817A, short gamma-ray bursts are likely associated with neutron star-neutron star merger events. Although rare, some bursts display episodes of early emission, with precursor flares being observed up to ∼ 10 seconds prior to the main burst. As the stars inspiral due to gravitational wave emission, the exertion of mutual tidal forces leads to the excitation of stellar oscillation modes, which may come into resonance with the orbital motion. Mode amplitudes increase substantially during a period of resonance as tidal energy is deposited into the star. The neutron star crust experiences shear stress due to the oscillations and, if the resonant amplitudes are large enough, may become over-strained. This over-straining can lead to fractures or quakes which release energy, thereby fueling precursor activity prior to the merger. Using some simple Maclaurin spheroid models, we investigate the influence of magnetic fields and rapid rotation on tidally-forced f -and r-modes, and connect the associated eigenfrequencies with the orbital frequencies corresponding to precursor events seen in, for example, GRB 090510.

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Section: Discussionmentioning

confidence: 99%