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To explore young star variability on a large range of timescales, we haveused the MOST satellite to obtain 24 days of continuous, sub-minute cadence,high-precision optical photometry on a field of classical and weak-lined TTauri stars (TTS) in the Taurus-Auriga star formation complex. Observations ofAB Aurigae, SU Aurigae, V396 Aurigae, V397 Aurigae, and HD 31305 revealbrightness fluctuations at the 1-10% level on timescales of hours to weeks. Wehave further assessed the variability properties with Fourier, wavelet, andautocorrelation techniques, identifying one significant period per star. Wepresent spot models in an attempt to fit the periodicities, but find that wecannot fully account for the observed variability. Rather, all stars exhibit amixture of periodic and aperiodic behavior, with the latter dominatingstochastically on timescales less than several days. After removal of the mainperiodicity, periodograms for each light curve display power law trendsconsistent with those seen for other young accreting stars. Several of ourtargets exhibited unusual variability patterns not anticipated by priorstudies, and we propose that this behavior originates with the circumstellardisks. The MOST observations underscore the need for investigation of TTS lightvariations on a wide range of timescales in order to elucidate the physicalprocesses responsible; we provide guidelines for future time seriesobservations.

Precise High-Cadence Time Series of Five Variable Young Stars in Auriga with MOST