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Crucial steps in the formation of stars and planets can be studied only atmid-infrared to far-infrared wavelengths, where SIRTF provides an unprecedentedimprovement in sensitivity. We will use all three SIRTF instruments (IRAC,MIPS, and IRS) to observe sources that span the evolutionary sequence frommolecular cores to protoplanetary disks, encompassing a wide range of cloudmasses, stellar masses, and star-forming environments. In addition to targetingabout 150 known compact cores, we will survey with IRAC and MIPS (3.6 to 70micron) the entire areas of five of the nearest large molecular clouds for newcandidate protostars and substellar objects as faint as 0.001 solarluminosities. We will also observe with IRAC and MIPS about 190 systems likelyto be in the early stages of planetary system formation(ages up to about 10Myr), probing the evolution of the circumstellar dust, the raw material forplanetary cores. Candidate planet-forming disks as small as 0.1 lunar masseswill be detectable. Spectroscopy with IRS of new objects found in the surveysand of a select group of known objects will add vital information on thechanging chemical and physical conditions in the disks and envelopes. Theresulting data products will include catalogs of thousands of previouslyunknown sources, multiwavelength maps of about 20 square degrees of molecularclouds, photometry of about 190 known young stars, spectra of at least 170sources, ancillary data from ground-based telescopes, and new tools foranalysis and modeling. These products will constitute the foundations for manyfollow-up studies with ground-based telescopes, as well as with SIRTF itselfand other space missions such as SIM, JWST, Herschel, and TPF.Comment: (22 pages, 10 figures, PASP in press

From Molecular Cores to Planet‐forming Disks: AnSIRTFLegacy Program