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29 March 2024
 
  » arxiv » 1902.0900

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Detection of a giant white-light flare on an L2.5 dwarf with the Next Generation Transit Survey
James A. G. Jackman ; Peter J. Wheatley ; Daniel Bayliss ; Matthew R. Burleigh ; Sarah L. Casewell ; Philipp Eigmüller ; Mike R. Goad ; Don Pollacco ; Liam Raynard ; Christopher A. Watson ; Richard G. West ;
Date 3 Feb 2019
AbstractWe present the detection of a $Delta Vsim$ -10 flare from the ultracool L2.5 dwarf ULAS J224940.13-011236.9 with the Next Generation Transit Survey (NGTS). The flare was detected in a targeted search of late-type stars in NGTS full-frame images and represents one of the largest flares ever observed from an ultracool dwarf. This flare also extends the detection of white-light flares to stars with temperatures below 2000 K. We calculate the energy of the flare to be $2.3^{+1.9}_{-1.0} imes10^{33}$erg, making it an order of magnitude more energetic than the Carrington event on the Sun. Our data show how the high-cadence NGTS full-frame images can be used to probe white-light flaring behaviour in the latest spectral types.
Source arXiv, 1902.0900
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