Detection of a giant flare displaying quasi-periodic pulsations from a pre-main-sequence M star by the Next Generation Transit Survey

James A. G. Jackman, Peter J. Wheatley, Chloe E. Pugh, Dmitrii Y. Kolotkov, Anne-Marie Broomhall, Grant M. Kennedy, Simon J. Murphy, Roberto Raddi, Matthew R. Burleigh, Sarah L. Casewell, Philipp Eigmüller, Edward Gillen, Maximilian N. Günther, James S. Jenkins, Tom Louden, James McCormac, Liam Raynard, Katja Poppenhaeger, Stéphane Udry, Christopher A. WatsonRichard G. West

Research output: Contribution to journalArticle

4 Citations (Scopus)
106 Downloads (Pure)

Abstract

We present the detection of an energetic flare on the pre-main sequence M3 star NGTS J121939.5-355557, which we estimate as only 2 Myr old. The flare had an energy of 3.2+{0.4}-{0.3} x 10^{36} 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 L_{X}/L_{Bol} = -3.1. In the flare peak we have identified multi-mode quasi-periodic pulsations formed of two statistically significant periods of approximately 320 and 660 seconds.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 seconds, which would not have been resolved in Kepler or TESS short cadence modes. Our data shows how the high cadence of NGTS can be used to apply solar techniques to stellar flares and 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 aid in our understanding of this.
Original languageEnglish
Pages (from-to)5553–5566
JournalMonthly Notices of the Royal Astronomical Society
Volume482
Issue number4
Early online date01 Dec 2018
DOIs
Publication statusPublished - 01 Feb 2019

Keywords

  • Astrophysics - Solar and Stellar Astrophysics

Fingerprint Dive into the research topics of 'Detection of a giant flare displaying quasi-periodic pulsations from a pre-main-sequence M star by the Next Generation Transit Survey'. Together they form a unique fingerprint.

  • Cite this

    Jackman, J. A. G., Wheatley, P. J., Pugh, C. E., Kolotkov, D. Y., Broomhall, A-M., Kennedy, G. M., Murphy, S. J., Raddi, R., Burleigh, M. R., Casewell, S. L., Eigmüller, P., Gillen, E., Günther, M. N., Jenkins, J. S., Louden, T., McCormac, J., Raynard, L., Poppenhaeger, K., Udry, S., ... West, R. G. (2019). Detection of a giant flare displaying quasi-periodic pulsations from a pre-main-sequence M star by the Next Generation Transit Survey. Monthly Notices of the Royal Astronomical Society, 482(4), 5553–5566. https://doi.org/10.1093/mnras/sty3036