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Title: Detection of a giant white-light flare on an L2.5 dwarf with the Next Generation Transit Survey
Authors: Jackman, JAG
Wheatley, PJ
Bayliss, D
Burleigh, MR
Casewell, SL
Eigmüller, P
Goad, MR
Pollacco, D
Raynard, L
Watson, CA
West, RG
First Published: 19-Mar-2019
Publisher: Oxford University Press (OUP), Royal Astronomical Society
Citation: Monthly Notices of the Royal Astronomical Society: Letters, 2019, 485(1), pp. L136–L140
Abstract: We present the detection of a V ∼ −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 × 1033 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.
DOI Link: 10.1093/mnrasl/slz039
eISSN: 1745-3933
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 2019, Oxford University Press (OUP), Royal Astronomical Society. Deposited with reference to the publisher’s open access archiving policy. (
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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