van Dishoeck, E. F. and Thi, W. F. and Blake, G. A. and Mannings, V. and Sargent, A. I. and Koerner, D. and Mundy, L. G. (1997) Search for H_2 Emission from Disks around T Tauri and Herbig AE Stars. Astrophysics and Space Science , 255 (1-2). pp. 77-82. ISSN 0004-640X http://resolver.caltech.edu/CaltechAUTHORS:20121002-103210709
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Preliminary results are presented of observations of the pure rotational lines of H_2 toward T Tauri and Herbig Ae stars using the Short Wavelength Spectrometer (SWS) on the Infrared Space Observatory (ISO). The sources are selected to be isolated low- and intermediate-mass young stellar objects, for which the presence of a circumstellar disk has been established by millimeter interferometry. The lowest H_2 S(0) and S(1) lines are detected in 3 out of 5 objects. The measured intensities indicate ∼ 0.01 M_⊙ of warm (T ≈ 150 K) gas in the ISO beam. It is argued that for at least one case (HD 163296), the emission is probably dominated by the warm gas in the circumstellar disk rather than by shocked- or photon-heated gas in the surrounding envelope. Such observations can provide important constraints on the radial and vertical temperature profiles in circumstellar disks.
|Additional Information:||© 1998 Kluwer Academic.|
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|Deposited By:||Tony Diaz|
|Deposited On:||02 Oct 2012 17:47|
|Last Modified:||02 Oct 2012 17:47|
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