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Edge-on protostars are valuable for understanding the disk and envelopeproperties of embedded young stellar objects, since the disk, envelope, andenvelope cavities are all distinctly visible in resolved images and wellconstrained in modeling. Comparing 2MASS, WISE, Spitzer, Herschel, APEX, andIRAM photometry and limits from 1.25 to 1200 microns, Spitzer spectroscopy from5 to 40 microns, and high-resolution Hubble imaging at 1.60 and 2.05 microns toradiative transfer modeling, we determine envelope and disk properties for theClass I protostar HOPS 136, an edge-on source in Orion's Lynds 1641 region. Thesource has a bolometric luminosity of 0.8 L_sun, a bolometric temperature of170 K, and a ratio of submillimeter to bolometric luminosity of 0.8%. Viamodeling, we find a total luminosity of 4.7 L_sun (larger than the observedluminosity due to extinction by the disk), an envelope mass of 0.06 M_sun, anda disk radius and mass of 450 AU and 0.002 M_sun. The stellar mass is highlyuncertain but is estimated to fall between 0.4 and 0.5 M_sun. To reproduce theflux and wavelength of the near-infrared scattered-light peak in the spectralenergy distribution, we require 5.4 x 10^-5 M_sun of gas and dust in eachcavity. The disk has a large radius and a mass typical of more evolved T Tauristars in spite of the significant remaining envelope. HOPS 136 appears to be akey link between the protostellar and optically revealed stages of starformation.

HOPS 136: An Edge-On Orion Protostar Near the End of Envelope Infall