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We present new HST ACS observations and detailed models for a recentlydiscovered edge-on protoplanetary disk around ESO H$\alpha$ 569 (a low-mass TTauri star in the Cha I star forming region). Using radiative transfer modelswe probe the distribution of the grains and overall shape of the disk(inclination, scale height, dust mass, flaring exponent and surface/volumedensity exponent) by model fitting to multiwavelength (F606W and F814W) HSTobservations together with a literature compiled spectral energy distribution.A new tool set was developed for finding optimal fits of MCFOST radiativetransfer models using the MCMC code emcee to efficiently explore the highdimensional parameter space. It is able to self-consistently and simultaneouslyfit a wide variety of observables in order to place constraints on the physicalproperties of a given disk, while also rigorously assessing the uncertaintiesin those derived properties. We confirm that ESO H$\alpha$ 569 is an opticallythick nearly edge-on protoplanetary disk. The shape of the disk is welldescribed by a flared disk model with an exponentially tapered outer edge,consistent with models previously advocated on theoretical grounds andsupported by millimeter interferometry. The scattered light images and spectralenergy distribution are best fit by an unusually high total disk mass (gas+dustassuming a ratio of 100:1) with a disk-to-star mass ratio of 0.16.

HST Scattered Light Imaging and Modeling of the Edge-on Protoplanetary Disk ESO-H$\alpha$ 569