Magneto-Centrifugal Origin for Protostellar Jets Validated through Detection of Radial Flow at the Jet Base

Abstract

Jets can facilitate the mass accretion onto the protostars in star formation. They are believed to be launched from accretion disks around the protostars by magneto-centrifugal force, as supported by the detections of rotation and magnetic field in some of them. Here we report a radial flow of the textbook-case protostellar jet HH 212 at the base to further support this jet-launching scenario. This radial flow validates a central prediction of the magneto-centrifugal theory of jet formation and collimation, namely, the jet is the densest part of a wide-angle wind that flows radially outward at distances far from the (small, sub-au) launching region. Additional evidence for the radially flowing wide-angle component comes from its ability to reproduce the structure and kinematics of the shells detected around the HH 212 jet. This component, which can transport material from inner to outer disk, could account for the chondrules and Ca-Al-rich inclusions detected in the Solar System at large distances.

18 pages, 6 figures

References in corpus (12)

• Tracing Slow Winds from T Tauri Stars via Low Velocity Forbidden Line Emission
• Formation and Atmosphere of Complex Organic Molecules of the HH 212 Protostellar Disk
• Connection between jets, winds and accretion in T Tauri stars: the X-shooter view
• The ALMA view of the protostellar system HH212 - The wind, the cavity, and the disk
• HH 212: SMA Observations of a Remarkable Protostellar Jet
• Jet Motion, Internal Working Surfaces, and Nested Shells in the Protostellar System HH 212
• Adaptive Optics Spectroscopy of the [Fe II] Outflows from HL Tauri and RW Aurigae
• Magnetically-driven jets and winds from weakly magnetized accretion disks
• Constraining MHD disk winds with ALMA. Apparent rotation signatures and application to HH212
• What Produces Dust Polarization in the HH 212 Protostellar Disk at 878 μm: Dust Self-Scattering or Dichroic Extinction?
• First Detection of Interaction between a Magnetic Disk Wind and an Episodic Jet in a Protostellar System
• The Giant Herbig-Haro Flow HH 212 and Associated Star Formation

Cited by in corpus (4)

• A Unified Model for Bipolar Outflows from Young Stars: Kinematic Signatures of Jets, Winds, and Their Magnetic Interplay with the Ambient Toroids
• A resolved rotating disk wind from a young T Tauri star in the Bok globule CB26
• A Unified Model for Bipolar Outflows from Young Stars: Apparent Magnetic Jet Acceleration
• ALMA and VLBA views on the outflow associated with an O-type protostar in G26.50+0.28