Further indications of jet rotation in new ultraviolet and optical Hubble Space Telescope STIS spectra

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Title: Further indications of jet rotation in new ultraviolet and optical Hubble Space Telescope STIS spectra
Authors: Coffey, DeirdreBacciotti, FrancescaRay, Thomas P.Eislöffel, JochenWoitas, Jens
Permanent link: http://hdl.handle.net/10197/11153
Date: 1-Jul-2007
Online since: 2019-10-17T09:24:58Z
Abstract: We present survey results that suggest rotation signatures at the base of T Tauri jets. Observations were conducted with the Hubble Space Telescope Imaging Spectrograph at optical and near-ultraviolet (NUV) wavelengths. Results are presented for the approaching jet from DG Tau, CW Tau, HH 30, and the bipolar jet from TH 28. Systematic asymmetries in Doppler shift were detected across the jet, within 100 AU from the star. At optical wavelengths, radial velocity differences were typically (10-25) ± 5 km s-1, while differences in the NUV range were consistently lower, at typically 10 ± 5 km s-1. Results are interpreted as possible rotation signatures. Importantly, there is agreement between the optical and NUV results for DG Tau. Under the assumption of steady magnetocentrifugal acceleration, the survey results lead to estimates for the distance of the jet footpoint from the star, and give values consistent with earlier studies. In the case of DG Tau, for example, we see that the higher velocity component appears to be launched from a distance of 0.2-0.5 AU from the star along the disk plane, while the lower velocity component appears to trace a wider part of the jet launched from as far as 1.9 AU. The results for the other targets are similar. Therefore, if indeed the detected Doppler gradients trace rotation within the jet, then under the assumption of steady MHD ejection, the derived footpoint radii support the existence of magnetized disk winds. However, since we do not resolved the innermost layers of the flow, we cannot exclude the possibility that there also exists an X-wind or stellar wind component. © 2007, The American Astronomical Society, All rights reserved.
Funding Details: Enterprise Ireland
European Commission
Science Foundation Ireland
metadata.dc.description.othersponsorship: Deutsches Zentrum fur Luft- und Raumfahrt
Type of material: Journal Article
Publisher: IOP Publishing
Journal: The Astrophysical Journal
Volume: 663
Issue: 1
Start page: 350
End page: 364
Copyright (published version): 2007 The American Astronomical Society
Keywords: JetsOutflowsStars FormationDG TauriCW TauriTH 28HH 30Pre-main sequence
DOI: 10.1086/518100
Language: en
Status of Item: Peer reviewed
Appears in Collections:Physics Research Collection

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