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|Title:||Ground-based detection of G star superflares with NGTS|
|Authors:||Jackman, James A G|
Wheatley, Peter J
Pugh, Chloe E
Gänsicke, Boris T
Armstrong, David J.
Burleigh, Matthew R.
Goad, Michael R.
Günther, Maximilian N.
Jenkins, James S.
Thompson, Andrew P. G.
Watson, Christopher A.
West, Richard G.
|Publisher:||Oxford University Press (OUP), Royal Astronomical Society|
|Citation:||Monthly Notices of the Royal Astronomical Society, 2018, 477(4), pp. 4655–4664.|
|Abstract:||We present high cadence detections of two superflares from a bright G8 star (V = 11.56) with the Next Generation Transit Survey (NGTS). We improve upon previous superflare detections by resolving the flare rise and peak, allowing us to fit a solar flare inspired model without the need for arbitrary break points between rise and decay. Our data also enables us to identify substructure in the flares. From changing star-spot modulation in the NGTS data, we detect a stellar rotation period of 59 h, along with evidence for differential rotation. We combine this rotation period with the observed ROSAT X-ray flux to determine that the star’s X-ray activity is saturated. We calculate the flare bolometric energies as 5.4+0.8 −0.7 × 10^34 and 2.6+0.4 −0.3 × 10^34 erg and compare our detections with G star superflares detected in the Kepler survey. We find our main flare to be one of the largest amplitude superflares detected from a bright G star. With energies more than 100 times greater than the Carrington event, our flare detections demonstrate the role that ground-based instruments such as NGTS can have in assessing the habitability of Earth-like exoplanets, particularly in the era of PLATO.|
|Rights:||Copyright © 2018, Oxford University Press (OUP), Royal Astronomical Society. Deposited with reference to the publisher’s open access archiving policy. (http://www.rioxx.net/licenses/all-rights-reserved)|
|Appears in Collections:||Published Articles, Dept. of Physics and Astronomy|
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