Koerner, D. W. and Sargent, A. I. (1995) Imaging the Small-Scale Circumstellar Gas Around T Tauri Stars. Astronomical Journal, 109 (5). pp. 2138-2145. ISSN 1538-3881. doi:10.1086/117439. https://resolver.caltech.edu/CaltechAUTHORS:20160608-184750116
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Abstract
We have detected circumstellar molecular gas around a small sample of T Tauri stars through aperture synthesis imaging of CO(2→1) emission at ˜2"-3" resolution. RY Tauri, DL Tauri, DO Tauri, and AS 209 show resolved and elongated gaseous emission. For RY Tau, the deconvolved, half-maximum radius along the direction of elongation, P.A. ˜48°, is 110 AU. Corresponding radii and orientations for the other sources are: DL Tau-250 AU at P.A. ˜84°; DO Tau-350 AU at P.A. ˜160°; AS 209-290 AU at P.A. ˜138°. RY Tau, DL Tau, and AS 209 show velocity gradients parallel to the elongation, suggesting that the circumstellar material is rotating. RY Tan and AS 209 also exhibit double-peaked spectra characteristic of a rotating disk. Line emission from DO Tan is dominated by high-velocity blue shifted gas which complicates the interpretation. Nevertheless, there is in each case sufficient evidence to speculate that the circumstellar emission may arise from a protoplanetary disk similar to that from which our solar system formed.
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Additional Information: | © 1995 American Astronomical Society. Received 1995 January 20; accepted 1995 January 25. We thank the anonymous referees for comments which helped clarify the results of this paper. D.K. acknowledges support from NASA Grant No. NGT-51071 and a Resident Research Associateship from the National Research Council. Owens Valley Radio Observatory is funded by NSF Grant No. AST-9314079. | ||||||||||||
Group: | Owens Valley Radio Observatory (OVRO) | ||||||||||||
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Issue or Number: | 5 | ||||||||||||
DOI: | 10.1086/117439 | ||||||||||||
Record Number: | CaltechAUTHORS:20160608-184750116 | ||||||||||||
Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20160608-184750116 | ||||||||||||
Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | ||||||||||||
ID Code: | 67792 | ||||||||||||
Collection: | CaltechAUTHORS | ||||||||||||
Deposited By: | Joy Painter | ||||||||||||
Deposited On: | 09 Jun 2016 04:31 | ||||||||||||
Last Modified: | 11 Nov 2021 03:54 |
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