Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aipc..713..107r&link_type=abstract
THE SEARCH FOR OTHER WORLDS: Fourteenth Astrophysics Conference. AIP Conference Proceedings, Volume 713, pp. 107-110 (2004).
Astronomy and Astrophysics
Astrophysics
1
Infrared Excess, Debris Disks, Protoplanetary Disks, Exo-Zodiacal Dust, Pre-Main Sequence Objects, Young Stellar Objects And Protostars, Circumstellar Shells, Clouds, And Expanding Envelopes, Circumstellar Masers
Scientific paper
High-resolution infrared spectra of HL Tau exhibit broad emission lines of 12CO gas phase molecules as well as narrow absorption lines of 12CO, 13CO, and C18O. The broad emission lines of vibrationally-excited 12CO are dominated by the hot (T ~1500 K) inner-disk (radius r < 0.2 AU). The narrow absorption lines of CO are found to originate from the circumstellar gas at a temperature of ~100 K. The cooler material indicates a large column of absorbing gas along the line of sight, which indirectly implies a large amount of dust extinction. However, the minimal opacity allowed by our emission line results severely constrains the M-band extinction and suggests that there is much less dust along the line of sight than inferred from the CO absorption data.
Brittain Sean
Haywood James
Kulesa Craig
Rettig Terrence
Simon Theodore
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