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MWC 778 is an unusual and little-studied young stellar object located in theIC 2144 nebula. Recent spectroscopy by Herbig and Vacca (2008) suggested thepresence of an edge-on circumstellar disk around it. We present near-infraredadaptive optics imaging polarimetry and mid-infrared imaging which directlyconfirm the suspected nearly-edge-on disk around MWC 778 (i ~ 70-80 degrees)plus reveal a more extensive envelope pierced by bipolar outflow cavities. Inaddition, our mid-infrared images and near-infrared polarization maps detect aspiral-shaped structure surrounding MWC 778, with arms that extend beyond 6" oneither side of the star.  Although MWC 778 has previously been classified as an Herbig Ae/Be star, theproperties of its central source (including its spectral type) remain fairlyuncertain. Herbig & Vacca (2008) suggested an F or G spectral type based on thepresence of metallic absorption lines in the optical spectrum, which impliesthat MWC 778 may belong to the fairly rare class of Intermediate-Mass T TauriStars (IMTTSs) which are the evolutionary precursors to Herbig Ae/Be objects.Yet its integrated bolometric luminosity, > 750 L_sun (for an assumed distanceof 1 kpc) is surprisingly high for an F or G spectral type, even for an IMTTS.We speculate on several possible explanations for this discrepancy, includingits true distance being much closer than 1 kpc, the presence of a binarycompanion, and/or a non-stellar origin for the observed absorption lines.

Evidence for an Edge-On Disk around the Young Star MWC 778 from Infrared Imaging and Polarimetry