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

LAMOST J024048.51+195226.9 (J0240+1952) was recently identified as the second AE Aquarii (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 time-scale 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.

Cui, LangChinese Academy of Sciences (författare)
Liu, XiangChinese Academy of Sciences (författare)
Zhang, BoShanghai Astronomical Observatory. Chinese Academy of Sciences,Shanghai Astronomical Observatory Chinese Academy of Sciences (författare)
Huang, YongfengNanjing University (författare)
Cao, Hong MinShangqiu Normal University (författare)
An, T.Shanghai Astronomical Observatory. Chinese Academy of Sciences,Shanghai Astronomical Observatory Chinese Academy of Sciences (författare)
Yang, Jun,1979Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)junya (författare)
Shu, FengchunShanghai Astronomical Observatory. Chinese Academy of Sciences,Shanghai Astronomical Observatory Chinese Academy of Sciences (författare)
Tan, Guiping (författare)
Yuan, Jianping (författare)
Chinese Academy of SciencesShanghai Astronomical Observatory. Chinese Academy of Sciences (creator_code:org_t)

Ingår i:Monthly Notices of the Royal Astronomical Society: Letters528:1, s. L112-L1161745-39251745-3933

Av författaren/redakt...: Jiang, Pengfei; Cui, Lang; Liu, Xiang; Zhang, Bo; Huang, Yongfeng; Cao, Hong Min; visa fler...; An, T.; Yang, Jun, 1979; Shu, Fengchun; Tan, Guiping; Yuan, Jianping; visa färre...

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