Burst-recurrence properties revealed with Insight-HXMT and NICER for the newly discovered accreting millisecond pulsar MAXI J1816--195

Astronomy & Astrophysics Pub Date : 2024-07-24 DOI:10.1051/0004-6361/202348352

P.J. Wang, Y.P. Chen, L. Ji, S. Zhang, S. Zhang, L.D. Kong, Z. Chang, L. Zhang, L. Tao, J. L. Qu, M. Ge, J. Li, J. Peng, Q. Shui, Z.S. Li

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Abstract

We report the results of our analysis of 83 type-I bursts during the 2022 outburst of the newly discovered accreting millisecond pulsar MAXI J1816--195 based on Insight-HXMT and NICER observations. We focus on the burst-recurrence time and its correlation with persistent flux and outburst evolution. The extensive observations of Insight-HXMT and NICER confirm the presence of quasi-periodic thermonuclear bursts during this outburst, with a recurrence time in the range of 1.15 to 2 hours, which varies with the source persistent flux. The burst recurrence times are, in general, longer at comparable flux levels in the outburst rising phase than those in the fading phase, forming an apparent hysteresis phenomenon. These burst properties make MAXI J1816--195 a unique target for investigating the underlying burst-accretion mechanisms. We discuss the plausible explanations for the hysteresis phenomenon, which appears to be related to changes in the ignition condition or accretion geometry during the outburst.

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利用 Insight-HXMT 和 NICER 发现的新发现吸积毫秒脉冲星 MAXI J1816-195 的爆发-再现特性

我们报告了基于 Insight-HXMT 和 NICER 观测对新发现的吸积毫秒脉冲星 MAXI J1816-195 在 2022 年爆发期间发生的 83 个 I 型爆发的分析结果。我们重点研究了爆发-再现时间及其与持续通量和爆发演化的相关性。Insight-HXMT和NICER的广泛观测证实，在这次爆发期间存在准周期性热核爆，其重现时间在1.15到2小时之间，随源持续通量的变化而变化。一般来说，在爆发上升阶段的可比通量水平下，爆发的重现时间要长于衰减阶段，形成明显的滞后现象。这些爆发特性使得MAXI J1816--195成为研究潜在爆发生成机制的独特目标。我们讨论了滞后现象的合理解释，这种现象似乎与爆发期间点火条件或增生几何形状的变化有关。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Astronomy & Astrophysics

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