NGTS clusters survey -- II. White-light flares from the youngest stars in Orion

James A. G. Jackman, Peter J. Wheatley, Jack S. Acton, David R. Anderson, Claudia Belardi, Matthew R. Burleigh, Sarah L. Casewell, Philipp Eigmüller, Samuel Gill, Edward Gillen, Michael R. Goad, Andrew Grange, Simon T. Hodgkin, James S. Jenkins, James McCormac, Maximiliano Moyano, Didier Queloz, Liam Raynard, Rosanna H. Tilbrook, Christopher A. Watson, Richard G. West

Published 2020-07-03Version 1

We present the detection of high energy white-light flares from pre-main sequence stars associated with the Orion complex, observed as part of the Next Generation Transit Survey (NGTS). With energies up to $5.2\times10^{35}$ erg these flares are some of the most energetic white-light flare events seen to date. We have used the NGTS observations of flaring and non-flaring stars to measure the average flare occurrence rate for 4 Myr M0-M3 stars. We have also combined our results with those from previous studies to predict average rates for flares above $1\times10^{35}$ ergs for early M stars in nearby young associations.