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We present the Coordinated Synoptic Investigation of NGC 2264, a continuous30-day multi-wavelength photometric monitoring campaign on more than 1000 youngcluster members using 16 telescopes. The unprecedented combination ofmulti-wavelength, high-precision, high-cadence, and long-duration data opens anew window into the time domain behavior of young stellar objects. Here weprovide an overview of the observations, focusing on results from Spitzer andCoRoT. The highlight of this work is detailed analysis of 162 classical T Tauristars for which we can probe optical and mid-infrared flux variations to 1%amplitudes and sub-hour timescales. We present a morphological variabilitycensus and then use metrics of periodicity, stochasticity, and symmetry tostatistically separate the light curves into seven distinct classes, which wesuggest represent different physical processes and geometric effects. Weprovide distributions of the characteristic timescales and amplitudes, andassess the fractional representation within each class. The largest category(>20%) are optical "dippers" having discrete fading events lasting ~1-5 days.The degree of correlation between the optical and infrared light curves ispositive but weak; notably, the independently assigned optical and infraredmorphology classes tend to be different for the same object. Assessment of fluxvariation behavior with respect to (circum)stellar properties revealscorrelations of variability parameters with H$\alpha$ emission and witheffective temperature. Overall, our results point to multiple origins of youngstar variability, including circumstellar obscuration events, hot spots on thestar and/or disk, accretion bursts, and rapid structural changes in the innerdisk.

the astronomical journal

CSI 2264: Simultaneous optical and infrared light curves of young  disk-bearing stars in NGC 2264 with CoRoT and Spitzer-- evidence for multiple  origins of variability