长周期射电暂现源 ASKAP J1448-68 是一颗激变变星
The long period radio transient ASKAP J1448-68 is a cataclysmic variable
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中文总结 AI 辅助
本文通过光谱和测光观测，确认长周期射电暂现源 ASKAP J1448-68 为激变变星，其轨道周期与射电脉冲周期一致，可能为极星，且无 He II 发射，表明 LPT 可源于不同吸积态的白矮星双星。
中文摘要 AI 辅助
宽视场时域射电巡天最近揭示了一类新的银河系射电辐射体：长周期射电暂现源（LPTs）。尽管发现速度很快，但其起源仍知之甚少，目前主要有两种理论：缓慢旋转的磁星或具有磁相互作用的双白矮星（WDs）。所有三个具有良好光学对应体的 LPTs 都是双星系统中的白矮星，但即使在该类中也有多样性，其中一个为吸积系统，两个为分离系统。在本快报中，我们表明 LPT ASKAP J1448-68 是一颗激变变星（CV）——一颗从低质量伴星吸积物质的白矮星——其光谱轨道周期与射电脉冲周期一致，并且具体而言，可能与其为极星（polar）的预期一致。与其他已知的 LPT 激变变星不同，ASKAP J1448-68 未表现出 He II 发射，而 He II 发射是高吸积态磁性激变变星的标志。我们还展示了新的光学时域测光和红外测光观测，显示出约 10% 水平的闪烁，并暗示其可能起源于周期跳跃者（period bouncer）。对 ASKAP J1448-68 的识别增加了已表征的 LPT 对应体的小样本，并表明 LPTs 可以产生于具有不同吸积态的白矮星双星系统。
英文摘要
Wide-field time-domain radio surveys have recently unveiled a new class of Galactic radio emitter: long period radio transients (LPTs). Despite the rapid pace of discovery, their origins remain poorly understood, with two main theories emerging: slowly spinning magnetars or binary white dwarfs (WDs) with magnetic interactions. All three LPTs with well-characterised optical counterparts are WDs in binary systems, but even within that class there is diversity, with one accreting and two detached systems. In this Letter, we show that the LPT ASKAP J1448-68 is a cataclysmic variable (CV)---a WD accreting from a low-mass companion---with a spectroscopic orbital period consistent with the radio pulse period, and specifically, potentially consistent with being a polar. Unlike the other known LPT CV, ASKAP J1448-68 does not exhibit the He II emission that is a hallmark of magnetic CVs in their high accretion states. We also present new optical time-series and infrared photometric observations, showing flickering at the 10% level and suggesting a possible period bouncer origin. This identification of ASKAP J1448-68 adds to the small sample of characterised LPT counterparts, and shows that LPTs can arise from WD binaries with a range of accretion states.
发表机构
- The Observatories of the Carnegie Institution for Science（卡内基科学研究所天文台）
- Department of Astronomy, California Institute of Technology（加州理工学院天文学系）
- University of North Carolina at Chapel Hill（北卡罗来纳大学教堂山分校）
- Sydney Institute for Astronomy, School of Physics, The University of Sydney（悉尼大学物理学院悉尼天体物理学研究所）
- ARC Centre of Excellence for Gravitational Wave Discovery (OzGrav)（ARC引力波发现卓越中心（OzGrav））
- Center for Gravitation, Cosmology, and Astrophysics, Department of Physics & Astronomy, University of Wisconsin-Milwaukee（威斯康星大学密尔沃基分校物理与天文学系引力、宇宙学与天体物理中心）
- Center for Astrophysics | Harvard & Smithsonian（哈佛-史密森尼天体物理中心）
- Institute of Science and Technology Austria（奥地利科学技术研究所）
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