ALMA Observations of the T Tauri Binary System AS 205: Evidence for Molecular Winds and/or Binary Interactions
Abstract
In this study, we present high-resolution millimeter observations of the dust and gas disk of the T Tauri star AS 205 N and its companion, AS 205 S, obtained with the Atacama Large Millimeter Array. The gas disk around AS 205 N, for which infrared emission spectroscopy demonstrates significant deviations from Keplerian motion that has been interpreted as evidence for a disk wind, also displays significant deviations from Keplerian disk emission in the observations presented here. Detections near both AS 205 N and S are obtained in 1.3 mm continuum, ^(12)CO 2–1, ^(13)CO 2–1, and C^(18)O 2–1. The ^(12)CO emission is extended up to ~2" from AS 205 N, and both ^(12)CO and ^(13)CO display deviations from Keplerian rotation at all angular scales. Two possible explanations for these observations hold up best to close scrutiny—tidal interaction with AS 205 S or disk winds (or a combination of the two)—and we discuss these possibilities in some detail.
Additional Information
© 2014 The American Astronomical Society. Received 2013 December 21; accepted 2014 July 3; published 2014 August 18. We thank the staff at the North American ALMA Science Center, especially Scott Schnee, for their help with the data reduction. C.S. acknowledges helpful discussions with Ilaria Pascucci, Sean Andrews, and Katherine Rosenfeld. C.S. also acknowledges the financial support of the NOAO Leo Goldberg Fellowship program. D.M. acknowledges helpful discussions with Dong Lai and Robert Harris. This paper makes use of the following ALMA data: ADS/JAO.ALMA#2011.0.00531.S. ALMAis a partnership of ESO (representing its member states), NSF (USA), and NINS (Japan), together with NRC (Canada) and NSC and ASIAA (Taiwan), in cooperation with the Republic of Chile. The Joint ALMA Observatory is operated by ESO, AUI/NRAO, and NAOJ. The National RadioAstronomyObservatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.Attached Files
Published - 0004-637X_792_1_68.pdf
Submitted - 1407.2652v1.pdf
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Additional details
- Eprint ID
- 50019
- Resolver ID
- CaltechAUTHORS:20140925-085304440
- National Optical Astronomy Observatory (NOAO)
- Created
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2014-09-25Created from EPrint's datestamp field
- Updated
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2021-11-10Created from EPrint's last_modified field
- Caltech groups
- Division of Geological and Planetary Sciences (GPS)