We report accretion-powered pulsations for the first time during thermonuclear bursts in hard X-rays, which were observed with Insight-HXMT in 2022 during the outburst of the accreting X-ray millisecond pulsar MAXI J1816-195. By stacking 73 bursts, we detected pulse profiles in 8–30 and 30–100 keV during bursts, which are identical to those obtained from the persistent (nonburst) emission. On average, no significant phase lag was observed between burst and persistent pulse profiles. In addition, we suggest that the interaction with burst photons can be used as a direct diagnostic to distinguish contributions from the hot plasma near polar caps and the corona around the accretion disk, which are highly degenerate in their spectral shapes.

中文翻译：

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热核爆发对吸积X射线毫秒脉冲星MAXI J1816-195极冠的影响

我们首次报告了硬 X 射线热核爆发期间的吸积动力脉动，这是在 2022 年吸积 X 射线毫秒脉冲星 MAXI J1816-195 爆发期间用 Insight-HXMT 观测到的。通过叠加 73 个突发，我们在突发期间检测到 8-30 和 30-100 keV 的脉冲轮廓，这与从持久（非突发）发射中获得的脉冲轮廓相同。平均而言，在突发脉冲和持续脉冲轮廓之间没有观察到明显的相位滞后。此外，我们建议与爆发光子的相互作用可以用作直接诊断，以区分极冠附近的热等离子体和吸积盘周围的日冕的贡献，这些物质的光谱形状高度简并。