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- W2796303604 abstract "Accreting neutron stars (NS) can exhibit high frequency modulations in their lightcurves during thermonuclear X-ray bursts, known as burst oscillations. The frequencies can be offset from the spin frequency of the NS by several Hz, and can drift by 1-3 Hz. One possible explanation is a mode in the bursting ocean, the frequency of which would decrease (in the rotating frame) as the burst cools, hence explaining the drifts. Most burst oscillations have been observed during H/He triggered bursts, however there has been one observation of oscillations during a superburst; hours' long Type I X-ray bursts caused by unstable carbon burning deeper in the ocean. This paper calculates the frequency evolution of an oceanic r-mode during a superburst. The rotating frame frequency varies during the burst from 4-14 Hz, and is sensitive to the background parameters, in particular the temperature of the ocean and ignition depth. This calculation is compared to the superburst oscillations observed on 4U-1636-536. The predicted mode frequencies ($sim$ 10 Hz) would require a spin frequency of $sim$ 592 Hz to match observations; 6 Hz higher than the spin inferred from an oceanic r-mode model for the H/He triggered burst oscillations. This model also over-predicts the frequency drift during the superburst by 90 %." @default.
- W2796303604 created "2018-04-13" @default.
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- W2796303604 date "2018-04-10" @default.
- W2796303604 modified "2023-10-01" @default.
- W2796303604 title "Superburst oscillations: ocean and crustal modes excited by carbon-triggered type I X-ray bursts" @default.
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- W2796303604 doi "https://doi.org/10.1093/mnras/sty895" @default.
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