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We present a first systematic time series study of a sample of blazarsobserved by the Transiting Exoplanet Survey Satellite $\textit{TESS}$spacecraft. By cross matching the positions of the sources in the TESSobservations with those from Roma-BZCAT, 29 blazars including both BL Lacerateobjects and flat-spectrum radio quasars were identified. The observationlengths of the 79 light curves of the sources, across all sectors on which thetargets of interest have been observed by $\textit{TESS}$, range between 21.25and 28.2 days. The light curves were analyzed using various methods of timeseries analysis. The results show that the sources exhibit significantvariability with fractional variability spanning between 1.41% and 53.84%. Theblazar flux distributions were studied by applying normal and lognormalprobability density function models. The results indicate that optical fluxhistogram of the sources are consistent with normal probability densityfunction with most of them following bi-modal distribution as opposed touni-modal distribution. This suggests that the days-timescale opticalvariability is contributed either by two different emission zones or twodistinct states of short-term activity in blazars. Power spectral densityanalysis was performed by using the power spectral response method and the truepower spectra of unevenly sampled light curves were estimated. The powerspectral slopes of the light curves ranged from 1.7 to 3.2.

Exploring Short-Term Optical Variability of Blazars Using $\textit{TESS}$