Evolution of the bursting-layer wave during a Type 1 X-ray burst

Abstract

In a popular scenario due to Heyl, quasi periodic oscillations (QPOs) which are seen during type 1 X-ray bursts are produced by giant travelling waves in neutron-star oceans. Piro and Bildsten have proposed that during the burst cooling the wave in the bursting layer may convert into a deep crustal interface wave, which would cut off the visible QPOs. This cut-off would help explain the magnitude of the QPO frequency drift, which is otherwise overpredicted by a factor of several in Heyl's scenario. In this paper, we study the coupling between the bursting layer and the deep ocean. The coupling turns out to be weak and only a small fraction of the surface-wave energy gets transferred to that of the crustal-interface wave during the burst. Thus the crustal-interface wave plays no dynamical role during the burst, and no early QPO cut-off should occur.

8 pages, submitted to MNRAS

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• Flame Propagation on the Surfaces of Rapidly Rotating Neutron Stars during Type I X-ray Bursts
• X-ray Burst Oscillations: From Flame Spreading to the Cooling Wake
• The accretion rate dependence of burst oscillation amplitude
• Discovery of burst oscillations in the intermittent accretion-powered millisecond pulsar HETE J1900.1-2455
• Relativistic ocean $r$-modes during type-I X-ray bursts
• Burning in the tail: implications for a burst oscillation model
• NICER Observation of Unusual Burst Oscillations in 4U 1728-34
• Three-dimensional instability of flame fronts in type I X-ray bursts
• Superburst oscillations: ocean and crustal modes excited by Carbon-triggered Type I X-ray bursts
• Waves in Thin Oceans on Oblate Neutron Stars
• The Peculiar Behavior of Burst Oscillations in the Accreting Millisecond X-ray Pulsar XTE J1814-338
• Damping of Type I X-ray Burst Oscillations by Convection