Published in
Oxford University Press (OUP), Monthly Notices of the Royal Astronomical Society: Letters, 1(485), p. L136-L140, 2019
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Detection of a giant white-light flare on an L2.5 dwarf with the Next Generation Transit Survey
,
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
Full text: Unavailable
Abstract
Abstract We present the detection of a ΔV ∼ −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 $3.4^{+0.9}_{-0.7}\times 10^{33}$ 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.
