H2 emission from disks around Herbig Ae and T Tauri stars

Details H2 emission from disks around Herbig Ae and T Tauri stars H2 emission from disks around Herbig Ae and T Tauri stars

Mar 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999esasp.427..767t&link_type=abstract

The Universe as Seen by ISO. Eds. P. Cox & M. F. Kessler. ESA-SP 427., p. 767

Computer Science

6

Molecular Hydrogen, Herbig Ae Stars, T Tauri Stars, Circumstellar Disks

Scientific paper

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. The observations suggest the presence of ``warm'' gas at Tkin~ 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 H2 are discussed, and comparisons with model calculations are made.

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