Monday

We have performed a search for flares and Quasi-Periodic Pulsations (QPPs) from low mass M dwarfs using TESS 2 min cadence data. We find seven stars which show evidence of QPPs. We confirm the presence of 11 QPPs in these seven stars with a period between 10.2 and 71.9 min, including an oscillation with drift in the period and a double-mode oscillation. The fraction of flares we examined which showed QPPs (7 percent) is higher than other studies of stellar flares, but is very similar to the fraction of Solar C-class flares. We determine the length of the coronal loops using several approaches and find they are similar to the stellar radius or greater. We also discuss the flare frequency of the seven stars determining whether this could result in ozone depletion or abiogenesis. Two of our stars have a sufficiently high rate of energetic flares which are likely to cause abiogenesis, while four of them are in the range for ozone depletion to occur. We
speculate on the implications for surface life on these stars and the effects of the loop lengths and QPPs on potential exoplanets in the habitable zone.