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The recent identification of several groups of young stars within 100 parsecsof the Sun has generated widespread interest. Given their proximity andpossible age differences, these systems are ideally suited for detailed studiesof star and planet formation. Here we report on the first investigation ofprotoplanetary disks in one such group, the high-latitude cloud MBM 12 at adistance of $\sim$65 pc. We present mid-infrared observations of the eightcandidate pre-main-sequence (PMS) members and the two main-sequence (MS) starsin the same line-of-sight which may or may not be associated with the group. Wehave also derived H$\alpha$ and Li line widths from medium-resolution opticalspectra. We report the discovery of significant mid-infrared excess from sixPMS stars --LkH$\alpha$ 262, LkH$\alpha$ 263, LkH$\alpha$ 264, E02553+2018,RXJ0258.3+1947 and S18 --presumably due to optically thick circumstellar disks.Our flux measurements for the other two PMS stars and the two MS stars areconsistent with photospheric emission, allowing us to rule out dusty innerdisks. The disks we have found in MBM 12 represent the nearest known sample ofvery young protoplanetary systems, and thus are prime targets forhigh-resolution imaging at infrared and millimeter wavelengths.Comment: 10 pages including one figure, to appear in The Astrophysical Journal  Letter

Protoplanetary Disks in the Nearest Star-Forming Cloud: Mid-Infrared Imaging and Optical Spectroscopy of MBM 12 Members