First Detection of Interaction between a Magnetic Disk Wind and an Episodic Jet in a Protostellar System

Abstract

Rotating outflows from protostellar disks might trace extended magneto-hydrodynamic (MHD) disk winds (DWs), providing a solution to the angular momentum problem in disk accretion for star formation. In the jet system HH 212, a rotating outflow was detected in SO around an episodic jet detected in SiO. Here we spatially resolve this SO outflow into three components: a collimated jet aligned with the SiO jet, the wide-angle disk outflow, and an evacuated cavity in between created by a large jet-driven bowshock. Although it was theoretically predicted before, it is the first time that such a jet-DW interaction is directly observed and resolved, and it is crucial for the proper interpretation and modeling of non-resolved DW candidates. The resolved kinematics and brightness distribution both support the wide-angle outflow to be an extended MHD DW dominating the local angular momentum extraction out to 40 au, but with an inner launching radius truncated to $\gtrsim 4$ au. Inside 4 au, where the DW may not exist, the magneto-rotational instability (MRI) might be transporting angular momentum outwards. The jet-DW interaction in HH 212, potentially present in other similar systems, opens an entirely new avenue to probe the large-scale magnetic field in protostellar disks.

15 pages, 5 figures

References in corpus (15)

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• Formation and Atmosphere of Complex Organic Molecules of the HH 212 Protostellar Disk
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• ALMA reveals a large structured disk and nested rotating outflows in DG Tau B
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• Ring formation and dust dynamics in wind-driven protoplanetary discs: global simulations
• First Abundance Measurement of Organic Molecules in the Atmosphere of HH 212 Protostellar Disk
• Jet Motion, Internal Working Surfaces, and Nested Shells in the Protostellar System HH 212
• An Exact, Three-Dimensional, Time-Dependent Wave Solution in Local Keplerian Flow
• Constraining MHD disk winds with ALMA. Apparent rotation signatures and application to HH212
• Kinematics of the Outflow From The Young Star DG Tau B: Rotation in the vicinities of an optical jet

Cited by in corpus (12)

• What Produces Dust Polarization in the HH 212 Protostellar Disk at 878 μm: Dust Self-Scattering or Dichroic Extinction?
• A Unified Model for Bipolar Outflows from Young Stars: Kinematic Signatures of Jets, Winds, and Their Magnetic Interplay with the Ambient Toroids
• The Evolution of Protostellar Outflow Cavities, Kinematics, and Angular Distribution of Momentum and Energy in Orion A: Evidence for Dynamical Cores
• Stratified Distribution of Organic Molecules at the Planet-Formation Scale in the HH 212 Disk Atmosphere
• Magneto-Centrifugal Origin for Protostellar Jets Validated through Detection of Radial Flow at the Jet Base
• FERIA: Flat Envelope Model with Rotation and Infall under Angular Momentum Conservation
• A resolved rotating disk wind from a young T Tauri star in the Bok globule CB26
• Synthetic Observations of the Infalling Rotating Envelope: Links between the Physical Structure and Observational Features
• Protostellar Outflows: a window to the past
• Can High-velocity Protostellar Jets Help to Drive Low-velocity Outflow?
• ALMA and VLBA views on the outflow associated with an O-type protostar in G26.50+0.28
• Rotating Motion of the Outflow of IRAS 16293-2422 A1 at its Origin Point near the Protostar