H_2 Emission From Disks Around Herbig Ae and T Tauri Stars
- Others:
- Cox, P.
- Kessler, M. F.
Abstract
We present the initial results of a deep ISO-SWS survey for the low J pure rotational emission lines of H2 toward a number of Herbig Ae and T Tauri stars. The objects are selected to be as isolated as possible from molecular clouds, with a spectral energy distribution characteristic of a circumstellar disk. For most of them the presence of a disk has been established directly by millimeter interferometry. The S (1) line is detected in most sources with a peak flux of 0.3-1 Jy. The S(0) line is definitely seen in 2 objects: GG Tau and HD 163296. The observations suggest the presence of "warm" gas at T_(kin) ≈ 100 K with a mass of a few % of the total gas+ dust mass, derived assuming a gas-to-dust ratio of 100:1. The S(1) peak flux does not show a strong correlation with spectral type of the central star or continuum flux at 1.3 millimeter. Possible origins for the warm gas seen in H_2 are discussed, and comparisons with model calculations are made.
Additional Information
© 1999 ESA Publications Division.Attached Files
Published - Thi_1999.pdf
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Additional details
- Eprint ID
- 34642
- Resolver ID
- CaltechAUTHORS:20121002-151349410
- Created
-
2012-10-03Created from EPrint's datestamp field
- Updated
-
2019-10-03Created from EPrint's last_modified field
- Caltech groups
- Division of Geological and Planetary Sciences
- Series Name
- ESA SP
- Series Volume or Issue Number
- 427