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We have performed a search for flares and Quasi-Periodic Pulsations (QPPs)from low mass M dwarf stars using TESS 2 min cadence data. We find seven starswhich show evidence of QPPs. Using Fourier and Empirical Mode Decompositiontechniques, we confirm the presence of 11 QPPs in these seven stars with aperiod between 10.2 and 71.9 min, including an oscillation with strong drift inthe period and a double-mode oscillation. The fraction of flares we examinedwhich showed QPPs (7 percent) is higher than other studies of stellar flares,but is very similar to the fraction of Solar C-class flares. Based on thestellar parameters taken from the TESS Input Catalog, we determine the lengthsand magnetic field strengths of the flare coronal loops using the period of theQPPs and various assumptions about the origin of the QPPs. We also use ascaling relationship based on flares from Solar and Solar-type stars and theobserved energy, plus the duration of the flares, finding that the differentapproaches predict loop lengths which are consistent to a factor of $\sim$2. Wealso discuss the flare frequency of the seven stars determining whether thiscould result in ozone depletion or abiogenesis. Three of our stars have asufficiently high rate of energetic flares which are likely to causeabiogenesis. However, two of them are also in the range where ozone depletionis likely to occur. We speculate on the implications for surface life on thesestars and the effects of the loop lengths and QPPs on potential exoplanets inthe habitable zone.

TESS observations of flares and quasi-periodic pulsations from low mass stars and potential impact on exoplanets