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Low-mass stars belonging to the M spectral type are the most numerous starsin our Galaxy, amounting to about two-thirds in number, and are found at thebottom of the main sequence in the H-R diagram. %Multi-wavelength studies onstar-forming regions help to understand the census of PMS stars, theirformation process, and the interaction of expanding H II regions harboringmassive stars with their natal molecular clouds. Photometric studies oflow-mass stars, including brown dwarfs (BDs), provide several importantevolutions of their atmosphere, magnetic flares and chromospheric activity.This paper highlights a few interesting results from our optical I-bandobservations of 2MASS J03435638+3209591 in the young star-forming IC~348 regionand three BDs in Taurus star-forming regions using ground-based telescopes aswell as a space-based telescope. We estimated the fast periodicities in therange of 1.5 to 3 hours in Taurus BDs. Furthermore, using the long-termphotometry from the Transiting Exoplanet Survey Satellite (TESS), we haveconducted a time-resolved variability analysis of CFHT-BD-Tau 4. Theperiodogram analysis of TESS data reveals an orbital period of $\sim$ 3 days.We found two flare events in TESS sector 43 data for this BD and estimated theflared energies as $4.59\times10^{35}$ erg and $2.64\times10^{36}$ erg, whichsit in the superflare range.

Photometric Variability of Low Mass Stars and Brown Dwarfs in IC~348 and Taurus Star-Forming Regions