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We investigate the environment of the very low-luminosity object L1521F IRSusing data from the Taurus Spitzer Legacy Survey. The MIPS 160 micron imageshows both extended emission from the Taurus cloud as well as emission frommultiple cold cores over a 1 X 2 deg region. Analysis shows that the cloud dusttemperature is 14.2 +- 0.4 K and the extinction ratio is A_160/A_K = 0.010 +-0.001 up to A_V ~ 4 mag. We find kappa_160 = 0.23 +- 0.046 cm^2/g for thespecific opacity of the gas-dust mixture. Therefore, for dust in the Tauruscloud we find the 160 um opacity is significantly higher than that measured forthe diffuse ISM, but not too different from dense cores, even at modestextinction values. Furthermore, the 160 um image shows features that do notappear in the IRAS 100 um image. We identify six regions as cold cores, i.e.colder than 14.2 K, all of which have counterparts in extinction maps or C18Omaps. We compare the effects of L1521F IRS on its natal core and find there isno evidence for dust heating at 160 or 100 um by the embedded source. From theinfrared luminosity L_TIR = 0.024 Lo we find L_bol = 0.034 - 0.046L_o, thusconfirming the source's low-luminosity. Comparison of L1521F IRS withtheoretical simulations for the very early phases of star formation appears torule out the first core collapse phase. The evolutionary state appears similarto or younger than the class 0 phase, and the estimated mass is likely to besubstellar.

Far-infrared Observations of the Very Low-Luminosity Embedded Source L1521F-IRS in the Taurus Star-Forming Region