A Rotating Protostellar Jet Launched from the Innermost Disk of HH 212
arXiv:1706.06343
Abstract
The central problem in forming a star is the angular momentum in the circumstellar disk which prevents material from falling into the central stellar core. An attractive solution to the "angular momentum problem" appears to be the ubiquitous (low-velocity and poorly-collimated) molecular outflows and (high-velocity and highly-collimated) protostellar jets accompanying the earliest phase of star formation that remove angular momentum at a range of disk radii. Previous observations suggested that outflowing material carries away the excess angular momentum via magneto-centrifugally driven winds from the surfaces of circumstellar disks down to ~ 10 AU scales, allowing the material in the outer disk to transport to the inner disk. Here we show that highly collimated protostellar jets remove the residual angular momenta at the ~ 0.05 AU scale, enabling the material in the innermost region of the disk to accrete toward the central protostar. This is supported by the rotation of the jet measured down to ~ 10 AU from the protostar in the HH 212 protostellar system. The measurement implies a jet launching radius of ~ 0.05_{-0.02}^{+0.05} AU on the disk, based on the magneto-centrifugal theory of jet production, which connects the properties of the jet measured at large distances to those at its base through energy and angular momentum conservation.
arXiv comment23 pages, 4 figures
References in corpus (15)
- HST/STIS Spectroscopy of the Optical Outflow from DG Tau: Indications for Rotation in the Initial Jet Channel
- Resolved images of a protostellar outflow launched by an extended disk wind
- A Feature Movie of SiO Emission 20-100 AU from the Massive Young Stellar Object Orion Source I
- Formation and Atmosphere of Complex Organic Molecules of the HH 212 Protostellar Disk
- A highly-collimated SiO jet in the HH212 protostellar outflow
- Rotation and Outflow motions in the very low-mass Class 0 protostellar system HH 211 at subarcsecond resolution
- Rotating molecular outflows: the young T Tauri star in CB26
- Jet Motion, Internal Working Surfaces, and Nested Shells in the Protostellar System HH 212
- Sub-arcsecond [FeII] spectro-imaging of the DG Tau jet: Periodic bubbles and a dusty disk wind?
- Investigating the transport of angular momentum from young stellar objects: do H2 jets from Class I YSOs rotate?
- High SiO abundance in the HH212 protostellar jet
- A Search for Consistent Jet and Disk Rotation Signatures in RY Tau
- Rotating Bullets from A Variable Protostar
- A study of the wiggle morphology of HH 211 through numerical simulations
- First Detection of Equatorial Dark Dust Lane in a Protostellar Disk at Submillimeter Wavelength