Characterizing the CO A-X Emission in Young Circumstellar Disks

Details Characterizing the CO A-X Emission in Young Circumstellar Disks Characterizing the CO A-X Emission in Young Circumstellar Disks

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21734033s&link_type=abstract

American Astronomical Society, AAS Meeting #217, #340.33; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

We present broad CO emission features in HST-COS FUV spectra of 6 classical T Tauri stars. The CO A-X fluorescence is modeled as photo-excitation by stellar C I emission, with a possible pumping contribution from chromospheric far-UV accretion present in young circumstellar disks. We focus on the 1600 (v'=0,v''=1), 1660 (v'=0,v''=2), and 1713 (v'=0,v''=3) Angstrom CO bands, as emission at shorter wavelengths experiences strong self-absorption and spectral confusion with photo-excited H2. Although the individual ro-vibrational lines are not resolved, the blended bands vary enough with temperature and column density to form confidence intervals from chi-squared fits to the data. The range in ages of our targets can allow us to characterize CO abundances vs. H2 abundances and age in proto-planetary disks.

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