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Using the Infrared Array Camera and the Multiband Imaging Photometer aboardthe {\it Spitzer Space Telescope}, we have obtained images of the Lupus 3star-forming cloud at 3.6, 4.5, 5.8, 8.0, and 24 \micron. We present photometryin these bands for the 41 previously known members that are within our images.In addition, we have identified 19 possible new members of the cloud based onred 3.6-8.0 \micron colors that are indicative of circumstellar disks. We haveperformed optical spectroscopy on 6 of these candidates, all of which areconfirmed as young low-mass members of Lupus 3. The spectral types of these newmembers range from M4.75 to M8, corresponding to masses of 0.2-0.03 $M_\odot$for ages of $\sim1$ Myr according to theoretical evolutionary models. We alsopresent optical spectroscopy of a candidate disk-bearing object in the vicinityof the Lupus 1 cloud, 2M 1541-3345, which Jayawardhana & Ivanov recentlyclassified as a young brown dwarf ($M\sim0.03$ $M_\odot$) with a spectral typeof M8. In contrast to their results, we measure an earlier spectral type ofM5.75$\pm$0.25 for this object, indicating that it is probably a low-mass star($M\sim0.1$ $M_\odot$). In fact, according to its gravity-sensitive absorptionlines and its luminosity, 2M 1541-3345 is older than members of the Lupusclouds ($\tau\sim1$ Myr) and instead is probably a more evolvedpre-main-sequence star that is not directly related to the current generationof star formation in Lupus.Comment: 18 pages, 3 tables, 6 figure

New Low‐Mass Stars and Brown Dwarfs with Disks in Lupus