Stellar flares detected with the Next Generation Transit Survey

James A G Jackman, Peter J Wheatley, Jack S Acton, David R Anderson, Daniel Bayliss, Joshua T Briegal, Matthew R Burleigh, Sarah L Casewell, Boris T Gänsicke, Samuel Gill, Edward Gillen, Michael R Goad, Maximilian N Günther, Beth A Henderson, Simon T Hodgkin, James S Jenkins, Chloe Pugh, Didier Queloz, Liam Raynard, Rosanna H TilbrookChristopher A Watson, Richard G West

Research output: Contribution to journalArticlepeer-review

Abstract

ABSTRACT We present the results of a search for stellar flares in the first data release from the Next Generation Transit Survey (NGTS). We have found 610 flares from 339 stars, with spectral types between F8 and M6, the majority of which belong to the Galactic thin disc. We have used the 13-s cadence NGTS light curves to measure flare properties such as the flare amplitude, duration, and bolometric energy. We have measured the average flare occurrence rates of K and early to mid-M stars and present a generalized method to measure these rates while accounting for changing detection sensitivities. We find that field age K and early M stars show similar flare behaviour, while fully convective M stars exhibit increased white-light flaring activity, which we attribute to their increased spin-down time. We have also studied the average flare rates of pre-main-sequence K and M stars, showing they exhibit increased flare activity relative to their main-sequence counterparts.
Original languageEnglish
Pages (from-to)3246-3264
Number of pages19
JournalMonthly Notices of the Royal Astronomical Society
Volume504
Issue number3
Early online date14 Apr 2021
DOIs
Publication statusPublished - 05 May 2021

Keywords

  • Space and Planetary Science
  • Astronomy and Astrophysics

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