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        The JCMT Transient Survey: An Extraordinary Submillimeter Flare in the T Tauri Binary System JW 566

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        Author
        Mairs, Steve
        Lalchand, Bhavana
        Bower, Geoffrey C.
        Forbrich, Jan
        Bell, Graham S.
        Herczeg, Gregory J.
        Johnstone, Doug
        Chen, Wen-Ping
        Lee, Jeong-Eun
        Hacar, Alvaro
        Attention
        2299/22476
        Abstract
        The binary T Tauri system JW 566 in the Orion Molecular Cloud underwent an energetic, short-lived flare observed at submillimetre wavelengths by the SCUBA-2 instrument on 26 November 2016 (UT). The emission faded by nearly 50% during the 31 minute integration. The simultaneous source fluxes averaged over the observation are 500 +/- 107 mJy/beam at 450 microns and 466 +/- 47 mJy/beam at 850 microns. The 850 micron flux corresponds to a radio luminosity of $L_{\nu}=8\times10^{19}$ erg/s/Hz, approximately one order of magnitude brighter (in terms of $\nu L_{\nu}$) than that of a flare of the young star GMR-A, detected in Orion in 2003 at 3mm. The event may be the most luminous known flare associated with a young stellar object and is also the first coronal flare discovered at sub-mm wavelengths. The spectral index between 450 microns and 850 microns of $\alpha = 0.11$ is broadly consistent with non-thermal emission. The brightness temperature was in excess of $6\times10^{4}$ K. We interpret this event to be a magnetic reconnection that energised charged particles to emit gyrosynchrotron/synchrotron radiation.
        Publication date
        2019-01-23
        Published in
        The Astrophysical Journal
        Published version
        https://doi.org/10.3847/1538-4357/aaf3b1
        License
        Unspecified
        Other links
        http://hdl.handle.net/2299/22476
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