Paper:	Studying Gas in Young and Debris Disks Using Spitzer
Volume:	357, The Spitzer Space Telescope: New Views of the Cosmos
Page:	47
Authors:	Hollenbach, D.; Gorti, U.
Abstract:	We present results from models that self-consistently calculate the gas chemistry, gas temperature, dust temperature, and vertical density distribution in circumstellar disks around young stars, and that predict the emergent infrared spectra. A parameter study of optically thin disks shows that fine structure lines such as [SI] 25 μm are generally stronger than the H2 rotational lines. Spitzer can detect lines from disks ≤ 100 pc with gas masses of ≥ 0.01MJ and some dust present (≥ 10−7 MJ ) to heat the gas. We model Spitzer upper limits on line fluxes from HD105, a 30 Myr old G0V star, and provide upper limits on the gas surface density and mass (≤ 1MJ ) in the planet-forming region (1-40 AU). Preliminary results for younger, optically thick disks are briefly discussed.

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