Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...200.7123r&link_type=abstract
American Astronomical Society, 200th AAS Meeting, #71.23; Bulletin of the American Astronomical Society, Vol. 34, p.951
Astronomy and Astrophysics
Astronomy
Scientific paper
Herbig AeBe and T Tauri stars are pre-main sequence objects that often display evidence of extended circumstellar disks. Planet formation has been known for many years to be tied to the accretion and evolution of gas and dust in these disks. We report the detection of the ro-vibrational bands of CO from the circumstellar material around pre-main sequence stars such as HD141569, AB Aurigae, HR5999, HD250550 etc. We present evidence to indicate the warm gas exists in the inner 50 AU of the disk and is not the same gas sampled by submillimeter measurements. We compare the SED's of the systems to the CO content, rotational temperature and excitation mechanism for several pre-main sequence stars representing various masses and ages. For a few of the systems the results allow us to discuss physical scenarios. The most likely source of the warm CO emission is from the star/disk interface where radiation clearing of the gas and dust and/or grain sublimation from the inner gap region continues. We also present our continuing efforts toward the understanding of two ortho-lines of H3+ detected in one of the HAeBe stars that represents the first detection of H3+ emission outside the Solar System and to determine whether they are produced from different sources in the inner disk as compared to CO. The discovery and production of H3+ emission is difficult to explain as a result of infalling planetesimals or material in the star/disk interface at sufficient density to produce H3+ emission. We will present these scenarios and discuss future theoretical and observational work prompted by this research. The data were obtained from observations using CSHELL at IRTF and NIRSPEC at KECK2. Visiting Astronomers at the Infrared Telescope Facility, operated by the University of Hawaii under contract from the National Aeronautics and Space Administration and the Keck2 telescope.
Brittain Sean
Rettig Terrence
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