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Periodic variability in young stellar objects (YSOs) offers indirect evidencefor an active dynamical mechanism. Starspots, accretion, stellar companions,and disk veiling can contribute to the photometric variability of YSOs. As partof an ongoing study of the Rho Oph star forming region, we report the discoveryof 92.6 day periodic variations for the Class I YSO YLW 16A, observed over aperiod of three years. A SED model was fit to available photometric data forthe object. We propose a triple-system with an inner binary with a period of 93days eclipsed by a warped circum-binary disk. The nature of the secondary isunconstrained and could be stellar or sub-stellar. We report the discovery of atertiary companion at a projected separation of ~40 AU that could account forthe circum-binary disk warp. This light curve and model is similar to the modelwe proposed for WL 4 in previous work. Understanding these systems may lead toinsights about the nature of stellar evolution and planetary formation, andprovide valuable benchmarks for future theoretical modeling and near- andmid-infrared synoptic surveys of YSOs.

The Identification of 93 Day Periodic Photometric Variability for YSO YLW 16A