VLBI detection of the AE Aqr twin, LAMOST J024048.51+195226.9

Q1 Earth and Planetary Sciences

Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2023-11-22 DOI:10.1093/mnrasl/slad178

Pengfei Jiang, Lang Cui, Xiang Liu, Bo Zhang, Yongfeng Huang, H. Cao, Tao An, Jun Yang, Fengchun Shu, Guiping Tan, J. Yuan

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Abstract

LAMOST J024048.51+195226.9 (J0240+1952) was recently identified as the second AE Aqr-type cataclysmic variable, possessing the fastest known rotating white dwarf. We performed a Very Long Baseline Interferometry (VLBI) observation of J0240+1952 utilizing the European VLBI Network at 1.7 GHz, to obtain the first view of the radio morphology on mas-scale. Our high-resolution VLBI image clearly shows that the radio emission is compact on mas-scale (≲ 2 AU), with no evidence for a radio jet or extended emission. The compact radio source has an average flux density of ∼0.37 mJy, and its brightness temperature is given at ≳ 2.3 × 107 K, confirming a non-thermal origin. The emission exhibits irregular variations on a timescale of tens of minutes, similar to the radio flares seen in AE Aqr. The measured VLBI position of J0240+1952 is consistent with that derived from Gaia. Our results favour the model in which the radio emission is attributed to a superposition of synchrotron radiation from expanding magnetized blobs of this system.

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VLBI探测到AE Aqr双胞胎，LAMOST J024048.51+195226.9

LAMOST J024048.51+195226.9（J0240+1952）最近被确认为第二颗AE Aqr型大灾变，拥有已知旋转速度最快的白矮星。我们利用欧洲 1.7 GHz VLBI 网络对 J0240+1952 进行了超长基线干涉测量（VLBI）观测，首次获得了马斯尺度的射电形态。我们的高分辨率 VLBI 图像清楚地显示，射电发射在马斯尺度（≲ 2 AU）上是紧凑的，没有射电喷流或扩展发射的证据。这个紧凑的射电源的平均通量密度为 ∼0.37 mJy，亮度温度为 ≳ 2.3 × 107 K，证实了它的非热源性质。其发射表现出数十分钟的不规则变化，与在 AE Aqr 中看到的射电耀斑相似。测量到的J0240+1952的VLBI位置与盖亚得出的位置一致。我们的结果支持这样一个模型，即射电辐射是由这个系统中不断膨胀的磁化球体发出的同步辐射叠加而成的。

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来源期刊

Monthly Notices of the Royal Astronomical Society: Letters Earth and Planetary Sciences-Space and Planetary Science

CiteScore

8.80

自引率

0.00%

发文量

136

期刊介绍： For papers that merit urgent publication, MNRAS Letters, the online section of Monthly Notices of the Royal Astronomical Society, publishes short, topical and significant research in all fields of astronomy. Letters should be self-contained and describe the results of an original study whose rapid publication might be expected to have a significant influence on the subsequent development of research in the associated subject area. The 5-page limit must be respected. Authors are required to state their reasons for seeking publication in the form of a Letter when submitting their manuscript.