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Precision infrared photometry from Spitzer has enabled the first directstudies of light from extrasolar planets, via observations at secondary eclipsein transiting systems. Current Spitzer results include the first longitudinaltemperature map of an extrasolar planet, and the first spectra of theiratmospheres. Spitzer has also measured a temperature and precise radius for thefirst transiting Neptune-sized exoplanet, and is beginning to make precisetransit timing measurements to infer the existence of unseen low mass planets.The lack of stellar limb darkening in the infrared facilitates precise radiusand transit timing measurements of transiting planets. Warm Spitzer will becapable of a precise radius measurement for Earth-sized planets transitingnearby M-dwarfs, thereby constraining their bulk composition. It will continueto measure thermal emission at secondary eclipse for transiting hot Jupiters,and be able to distinguish between planets having broad band emission versusabsorption spectra. It will also be able to measure the orbital phase variationof thermal emission for close-in planets, even non-transiting planets, andthese measurements will be of special interest for planets in eccentric orbits.Warm Spitzer will be a significant complement to Kepler, particularly asregards transit timing in the Kepler field. In addition to studying close-inplanets, Warm Spitzer will have significant application in sensitive imagingsearches for young planets at relatively large angular separations from theirparent stars.

Observations of Extrasolar Planets During the non-Cryogenic Spitzer Space Telescope Mission