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We present Spitzer Space Telescope observations of the "evolved starlesscore" L1521F which reveal the presence of a very low luminosity object (L <0.07 Lsun). The object, L1521F-IRS, is directly detected at mid-infraredwavelengths (>5 micron) but only in scattered light at shorter infraredwavelengths, showing a bipolar nebula oriented east-west which is probablytracing an outflow cavity. The nebula strongly suggests that L1521F-IRS isembedded in the L1521F core. Thus L1521F-IRS is similar to the recentlydiscovered L1014-IRS and the previously known IRAM 04191 in its substellarluminosity and dense core environment. However these objects differsignificantly in their core density, core chemistry, and outflow properties,and some may be destined to be brown dwarfs rather than stars.Comment: 10 pages with 3 figures, accepted by ApJ Letter

The Spitzer c2d Survey of Nearby Dense Cores. II. Discovery of a Low-Luminosity Object in the "Evolved Starless Core" L1521F