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arXiv 2510.26682astro-ph.SR
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一个极其快速衰减的Population II矮矮新星候选体：在上升阶段被光谱学捕捉

An extremely fast fading population II dwarf nova candidate: caught spectroscopically on the rise

Swinburne University of Technology（斯威本科技大学）；ARC Centre of Excellence for Gravitational Wave Discovery (OzGrav)（引力波发现卓越研究中心）；Australian Research Council Centre of Excellence for All-sky Astrophysics in 3 Dimensions (ASTRO 3D)（全天空三维天体物理学卓越研究中心）；Joint Space-Science Institute, University of Maryland（马里兰大学联合空间科学研究所）；University of North Carolina at Chapel Hill（北卡罗来纳大学教堂山分校）；NASA Goddard Space Flight Center（美国国家航空航天局戈达德太空飞行中心）；The University of Melbourne（墨尔本大学）
Natasha Van Bemmel, Jielai Zhang, Jeff Cooke, Anais Möller, Igor Andreoni, Katie Auchettl, David Buckley, Jonathan Carney, Dougal Dobie, James Freeburn, Bruce G… 展开作者

Natasha Van Bemmel, Jielai Zhang, Jeff Cooke, Anais Möller, Igor Andreoni, Katie Auchettl, David Buckley, Jonathan Carney, Dougal Dobie, James Freeburn, Bruce Gendre, Vanshika Kansal, Itumeleng Monageng, Arne Rau, Nikita Rawat, Mark Suhr, Edward N. Taylor

备注：
10 pages, 9 figures, 3 tables, submitted to MNRAS
发表信息：
Mon Not R Astron Soc (2026)
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AI总结：

AT2022kak是首个在上升阶段被光谱学捕捉的快速衰减矮矮新星候选体，其快速演变行为使其成为观测到最快的和最暗的矮矮新星之一，可能属于Population II系统。

摘要：

我们介绍了AT2022kak，一个由KiloNova和暂现体计划（KNTraP）发现的快速演变的光学暂现体。这个有趣的爆发表现出极快的演变，单夜内出现m>3.3的大幅蓝爆发，并在接下来的两夜内迅速衰减到宁静状态。我们部署了多波段后续观测计划，对目标进行了两个月的监测，但未见再次爆发。三年后，当观测以获取目标宁静状态下的光谱时，又发生了一次爆发，使我们能够收集到爆发上升和衰减阶段的时间分辨光谱。第一次爆发的光曲线特性和第二次爆发的光谱一致于矮矮新星。其快速演变行为使其成为观测到最快的和最暗的矮矮新星之一。AT2022kak与银河系中心的距离估计为约6.6kpc，尺度高度约为2kpc。这个尺度高度将其置于银河系厚盘中，而该区域仅发现极少数矮矮新星，因此AT2022kak可能是一个Population II矮矮新星系统。

英文摘要：

We present AT2022kak, a rapidly evolving optical transient discovered by the KiloNova and Transients Program (KNTraP). This interesting burst exhibited extremely fast evolution, with a large amplitude blue outburst of m > 3.3 in a single night, and a rapid fade back to quiescence in the following two nights. We deployed a multi-wavelength follow-up campaign, monitoring the object for the next two months, but saw no recurrent burst. Three years later, while observing to get spectroscopy of the object in quiescence, there was a new outburst, enabling the collection of time-resolved spectra of the rise and fade of the outburst. The light curve properties of the first burst and spectra of the second burst are consistent with a dwarf nova. Its fast evolving behaviour makes it one of the fastest and faintest dwarf novae observed. The estimated distance of AT2022kak from the Galactic centre is ~6.6 kpc, with a scale height of ~2 kpc. This scale height places it in the Galactic thick disk, where only very few dwarf novae have been found, and is therefore a potential Population II dwarf novae system.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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