Multi-epoch subarcsecond [Fe II] spectroimaging of the DG Tau outflows with NIFS – II. On the nature of the bipolar outflow asymmetry

Article


White, M. C., Bicknell, G. V., McGregor, P. J. and Salmeron, R. 2014. "Multi-epoch subarcsecond [Fe II] spectroimaging of the DG Tau outflows with NIFS – II. On the nature of the bipolar outflow asymmetry." Monthly Notices of the Royal Astronomical Society. 442 (1), pp. 28-42. https://doi.org/10.1093/mnras/stu788
Article Title

Multi-epoch subarcsecond [Fe II] spectroimaging of the DG Tau outflows with NIFS – II. On the nature of the bipolar outflow asymmetry

ERA Journal ID1074
Article CategoryArticle
AuthorsWhite, M. C. (Author), Bicknell, G. V. (Author), McGregor, P. J. (Author) and Salmeron, R (Author)
Journal TitleMonthly Notices of the Royal Astronomical Society
Journal Citation442 (1), pp. 28-42
Number of Pages15
Year2014
PublisherOxford University Press
Place of PublicationUnited Kingdom
ISSN0035-8711
1365-2966
Digital Object Identifier (DOI)https://doi.org/10.1093/mnras/stu788
Web Address (URL)https://academic.oup.com/mnras/article/442/1/28/1226538
Abstract

The origin of bipolar outflow asymmetry in young stellar objects (YSOs) remains poorly understood. It may be due to an intrinsically asymmetric outflow launch mechanism, or it may be caused by the effects of the ambient medium surrounding the YSO. Answering this question is an important step in understanding outflow launching. We have investigated the bipolar outflows driven by the T Tauri star DG Tauri on scales of hundreds of astronomical units, using the Near-infrared Integral Field Spectrograph on Gemini-North. The approaching outflow consists of a well-collimated jet, nested within a lower-velocity disc wind. The receding outflow is composed of a single-component bubble-like structure. We analyse the kinematics of the receding outflow using kinetic models, and determine that it is a quasi-stationary bubble with an expanding internal velocity field. We propose that this bubble forms because the receding counterjet from DG Tau is obstructed by a clumpy ambient medium above the circumstellar disc surface, based on similarities between this structure and those found in the modelling of active galactic nuclei outflows. We find evidence of interaction between the obscured counterjet and clumpy ambient material, which we attribute to the large molecular envelope around the DG Tau system. An analytical model of a momentum-driven bubble is shown to be consistent with our interpretation. We conclude that the bipolar outflow from DG Tau is intrinsically symmetric, and the observed asymmetries are due to environmental effects. This mechanism can potentially be used to explain the observed bipolar asymmetries in other YSO outflows.

Keywordstechniques: high angular resolution, techniques: imaging spectroscopy, stars: individual: DG Tauri, stars: protostars, stars: variables: T Tauri, Herbig Ae/Be, ISM: jets and outflows
ANZSRC Field of Research 2020510109. Stellar astronomy and planetary systems
Public Notes

This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2014 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

Byline AffiliationsAustralian National University
Institution of OriginUniversity of Southern Queensland
Funding source
Australian Research Council (ARC)
Grant ID
120101792
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