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