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We report the discovery of a spatially-resolved edge-on protoplanetary diskin the ~2-Myr-old MBM 12 young association. Our near-infrared images of LkHa263C (MBM 12A 3C), obtained with the Hokupa'a adaptive optics system on theGemini North telescope, clearly show two elongated reflection nebulositiesseparated by a dark lane, a morphology well-matched by scattered light modelsof an optically thick (at near-infrared wavelengths) edge-on disk. An opticalspectrum of the scattered light nebulosity obtained with the Keck II telescopeexhibits a spectral type of M0 +/- 0.5 (T_eff = 3850 +/- 100 K) for the centralstar and contains H_alpha and forbidden emission lines, which may indicate thepresence of a jet. The absence of a near-infrared point source implies A_K >9.5 toward the unseen central star. The disk is flared and has a radius of ~150AU (at a distance of 275 pc) and an inclination of 87 degrees. The aspect ratioof the model disk in the J-band is 0.72. There is possible evidence for dustsettling to the disk midplane. LkHa 263C is 4.115" from the 0.415" binary LkHa263 A and B (MBM 12A 3A and 3B), which is itself 15.5" from LkHa 262 (MBM 12A2). Thus, LkHa 263C may be the first disk to be clearly resolved around anindividual star in a young quadruple system. The detection of a faint edge-ondisk near a bright star demonstrates both the high angular resolution and thehigh sensitivity that can be achieved with adaptive optics imaging on largetelescopes.Comment: 12 pages, 3 PostScript figures, to appear in The Astrophysical  Journal Letter

Discovery of an Edge-On Disk in the MBM 12 Young Association