Please use this identifier to cite or link to this item: http://hdl.handle.net/2381/43240
Title: Detection of a giant flare displaying quasi-periodic pulsations from a pre-main sequence M star with NGTS
Authors: Jackman, JAG
Wheatley, PJ
Pugh, CE
Kolotkov, DY
Broomhall, A-M
Kennedy, GM
Murphy, SJ
Raddi, R
Burleigh, MR
Casewell, SL
Eigmüller, P
Gillen, E
Günther, MN
Jenkins, JS
Louden, T
McCormac, J
Raynard, L
Poppenhaeger, K
Udry, S
Watson, CA
West, RG
First Published: 1-Dec-2018
Publisher: Oxford University Press (OUP), Royal Astronomical Society
Citation: Monthly Notices of the Royal Astronomical Society, 2019, 482(4) pp. 5553–5566
Abstract: We present the detection of an energetic flare on the pre-main-sequence M3 star NGTS J121939.5–355557, which we estimate to be only 2 Myr old. The flare had an energy of 3.2 ±0.4 0.3 ×1036 erg and a fractional amplitude of 7.2 ± 0.8, making it one of the most energetic flares seen on an M star. The star is also X-ray active, in the saturated regime with log LX/LBol = −3.1. In the flare’s peak, we have identified multimode quasi-periodic pulsations formed of two statistically significant periods of approximately 320 and 660 s. This flare is one of the largest amplitude events to exhibit such pulsations. The shorter period mode is observed to start after a short-lived spike in flux lasting around 30 s, which would not have been resolved in Kepler or TESS short-cadence modes. Our data show how the high cadence of the Next Generation Transient Survey (NGTS) can be used to apply solar techniques to stellar flares and to identify potential causes of the observed oscillations. We also discuss the implications of this flare for the habitability of planets around M star hosts and how NGTS can help our understanding of this.
DOI Link: 10.1093/mnras/sty3036
eISSN: 1365-2966
Links: https://academic.oup.com/mnras/article/482/4/5553/5224549
http://hdl.handle.net/2381/43240
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
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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