Origin of Misalignments: Protostellar Jet, Outflow, Circumstellar Disc, and Magnetic Field

Abstract

Recent observations uncover various phenomena around the protostar such as misalignment between the outflow and magnetic field, precession of the jet, and time variability of the ejected clumps, whose origins are under debate. We perform a three-dimensional resistive magnetohydrodynamics simulation of the protostar formation in a star-forming core whose rotation axis is tilted at an angle $45^{\circ }$ with respect to the initial magnetic field, in which the protostar is resolved with a spatial resolution of $0.01$au. In low-dense outer region, the prestellar core contracts along the magnetic field lines due to the flux freezing. In high-dense inner region, on the other hand, the magnetic dissipation becomes efficient and weakens the magnetic effects when the gas number density exceeds about $10^{11}\mathrm{c}{\mathrm{m}}^{-3}$. Then, the normal direction of the flattened disc is aligned with the angular momentum vector. The outflow, jet, and protostellar ejection are driven from different scales of the circumstellar disc and spout in different directions normal to the warped disc. These axes do not coincide with the global magnetic field direction and vary with time. This study demonstrates that a couple of misalignment natures reported by observations can be simultaneously reproduced only by assuming the star-forming core rotating around a different direction from the magnetic field.

8 pages, 6 figures, Accepted for publication in MNRAS

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• Misalignment of Magnetic Fields, Outflows and Discs in Star-forming Clouds
• Early Planet Formation in Embedded Disks (eDisk). IV. The Ringed and Warped Structure of the Disk around the Class I Protostar L1489 IRS
• A Pseudodisk Threaded with a Toroidal and Pinched Poloidal Magnetic Field Morphology in the HH 211 Protostellar System
• FAUST III. Misaligned rotations of the envelope, outflow, and disks in the multiple protostellar system of VLA 1623$-$2417
• Multi-scale view of star formation in IRAS 21078+5211: From clump fragmentation to disk wind
• An observational correlation between magnetic field, angular momentum and fragmentation in the envelopes of Class 0 protostars?
• On the magnetic field properties of protostellar envelopes in Orion
• Physical properties of accretion shocks toward the Class I protostellar system Oph-IRS 44
• ALMA Observations toward the S-shaped Outflow and the Envelope around NGC1333 IRAS 4A2
• Curved jet motion. I. Orbiting and precessing jets
• Linear Stability Analysis of a Magnetic Rotating Disk with Ohmic Dissipation and Ambipolar Diffusion
• HOPS 361-C's Jet Decelerating and Precessing Through NGC 2071 IR
• The ALMA Survey of 70 $\mu$m Dark High-mass Clumps in Early Stages (ASHES). XII. Unanchored Forked Stream in the Propagating Path of a Protostellar Outflow
• Simulating the collapse of rotating primordial gas clouds to study the survival possibility of Pop III protostars
• Imaging of HH80-81 jet in the NIR shock tracers H${}_2$ and [Fe II]
• Binary outflows from young stars: interaction of co-orbital jet and wind
• Can High-velocity Protostellar Jets Help to Drive Low-velocity Outflow?