Astrophysics and Space Science

, Volume 255, Issue 1, pp 77–82

Search for H2 Emission from Disks around T Tauri and Herbig AE Stars


  • E.F. Van Dishoeck
    • Leiden Observatory
  • W.F. Thi
    • Leiden Observatory
  • G.A. Blake
    • California Institute of Technology
  • V. Mannings
    • California Institute of Technology
  • A.I. Sargent
    • California Institute of Technology
  • D. Koerner
    • Jet Propulsion Laboratory 169-506
  • L.G. Mundy
    • Univ. of Maryland

DOI: 10.1023/A:1001110801449

Cite this article as:
Van Dishoeck, E., Thi, W., Blake, G. et al. Astrophysics and Space Science (1997) 255: 77. doi:10.1023/A:1001110801449


Preliminary results are presented of observations of the pure rotational lines of H2 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 H2 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.

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© Kluwer Academic Publishers 1997