Studying Gas in Young and Debris Disks Using Spitzer

Details Studying Gas in Young and Debris Disks Using Spitzer Studying Gas in Young and Debris Disks Using Spitzer

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aspc..357...47h&link_type=abstract

The Spitzer Space Telescope: New Views of the Cosmos ASP Conference Series, Volume 357, proceedings of the conference held 9-12

Astronomy and Astrophysics

Astronomy

Scientific paper

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 ⪆ 0.01 MJ and some dust present (⪆ 10-7 MJ) to heat the gas. We model Spitzer upper limits on line fluxes from HD 105, a 30 Myr old G0V star, and provide upper limits on the gas surface density and mass (⪉ 1 MJ) in the planet-forming region (1-40 AU). Preliminary results for younger, optically thick disks are briefly discussed.

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