Thi, Wing-Fai and van Dishoeck, Ewine F. and Blake, Geoffrey A. and van Zadelhoff, Gerd-Jan and Hogerheijde, Michiel R. (1999) Detection of H_2 Pure Rotational Line Emission from the GG Tauri Binary System. Astrophysical Journal Letters, 521 (1). L63-L66. ISSN 0004-637X http://resolver.caltech.edu/CaltechAUTHORS:20120920-073949849
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We present the first detection of the low-lying pure rotational emission lines of H_2 from circumstellar disks around T Tauri stars, using the Short Wavelength Spectrometer on the Infrared Space Observatory. These lines provide a direct measure of the total amount of warm molecular gas in disks. The J = 2 → 0 S(0) line at 28.218 μm and the J = 3 → 1 S(1) line at 17.035 μm have been observed toward the double binary system GG Tau. Together with limits on the J = 5 → 3 S(3) and J = 7 → 5 S(5) lines, the data suggest the presence of gas at T_(kin) ≈ 110 ± 10 K with a mass of (3.6 ± 2.0) × 10^(-3) M_☉ (±3 σ). This amounts to ~3% of the total gas + dust mass of the circumbinary disk as imaged by millimeter interferometry, but it is larger than the estimated mass of the circumstellar disk(s). Possible origins for the warm gas seen in H_2 are discussed in terms of photon and wind-shock heating mechanisms of the circumbinary material, and comparisons with model calculations are made.
|Additional Information:||© 1999 American Astronomical Society. Received 1999 April 2; accepted 1999 June 11; published 1999 July 8. This work was supported by the Netherlands Organization for Scientific Research (NWO) grant 614.41.003, and by grants to G. A. B. from NASA (NAGW-4383 and NAG5-3733). M. R. H. is supported by the Miller Institute for Basic Research in Science. The W. M. Keck Observatory is operated as a scientific partnership between Caltech, University of California, and NASA. It was made possible by the generous financial support of the W. M. Keck Foundation.|
|Subject Keywords:||circumstellar matter; infrared: ISM; ISM: lines and bands; ISM: molecules; molecular processes; stars: individual (GG Tauri); stars: formation|
|Official Citation:||Detection of H2 Pure Rotational Line Emission from the GG Tauri Binary System Wing-Fai Thi et al. 1999 ApJ 521 L63|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Ruth Sustaita|
|Deposited On:||20 Sep 2012 16:00|
|Last Modified:||26 Dec 2012 16:13|
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