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AU Mic is a young ($\sim$24 Myr), pre-Main Sequence M~dwarf star that wasobserved in the first month of science observations of the Transiting ExoplanetSurvey Satellite (TESS) and re-observed two years later. This target hasphotometric variability from a variety of sources that is readily apparent inthe TESS light curves; spots induce modulation in the light curve, flares arepresent throughout (manifesting as sharp rises with slow exponential decayphases), and transits of AU Mic b may be seen by eye as dips in the lightcurve. We present a combined analysis of both TESS Sector 1 and Sector 27 AUMic light curves including the new 20-second cadence data from TESS Year 3. Wecompare flare rates between both observations and analyze the spot evolution,showing that the activity levels increase slightly from Sector 1 to Sector 27.Furthermore, the 20-second data collection allows us to detect more flares,smaller flares, and better resolve flare morphology in white light as comparedto the 2-minute data collection mode. We also refine the parameters for AU Micb by fitting three additional transits of AU Mic b from Sector 27 using a modelthat includes stellar activity. We show that the transits exhibit clear transittiming variations (TTVs) with an amplitude of $\sim$80 seconds. We also detectthree transits of a 2.8 $R_\oplus$ planet, AU Mic c, which has a period of18.86 days.

Flares, Rotation, and Planets of the AU Mic System from TESS Observations