The Winds from HL Tau

Abstract

Outflowing motions, whether a wind launched from the disk, a jet launched from the protostar, or the entrained molecular outflow, appear to be an ubiquitous feature of star formation. These outwards motions have a number of root causes, and how they manifest is intricately linked to their environment as well as the process of star formation itself. Using the ALMA Science Verification data of HL Tau, we investigate the high velocity molecular gas being removed from the system as a result of the star formation process. We aim to place these motions in context with the optically detected jet, and the disk. With these high resolution ($\sim 1"$) ALMA observations of CO (J=1-0), we quantify the outwards motions of the molecular gas. We find evidence for a bipolar outwards flow, with an opening angle, as measured in the red-shifted lobe, starting off at 90${}^{\circ }$, and narrowing to 60${}^{\circ }$ further from the disk, likely because of magnetic collimation. Its outwards velocity, corrected for inclination angle is of order 2.4 km s${}^{-1}$.

8 Pages, 8 figures, 3 tables. To appear in MNRAS

References in corpus (15)

• Astropy: A Community Python Package for Astronomy
• First Results from High Angular Resolution ALMA Observations Toward the HL Tau Region
• Photoevaporation of protoplanetary discs I: hydrodynamic models
• Spatially Resolved Magnetic Field Structure in the Disk of a T Tauri Star
• Molecule survival in magnetized protostellar disk winds. I. Chemical model and first results
• The Magnetic Field Morphology of the Class 0 Protostar L1157-mm
• Resolving the Circumstellar Disk of HL Tauri at Millimeter Wavelengths
• ALMA detection of the rotating molecular disk wind from the young star HD 163296
• Spatially Extended Brackett Gamma Emission in the Environments of Young Stars
• High resolution imaging polarimetry of HL Tau and magnetic field structure
• A Multi-Epoch HST Study of the Herbig-Haro Flow from XZ Tauri
• A Micro Molecular Bipolar Outflow From HL Tau
• High Angular Resolution Radio Observations of the HL/XZ Tau Region: Mapping the 50 AU Protoplanetary Disk around HL Tau and Resolving XZ Tau S into a 13 AU Binary
• SMA Submillimeter Observations of HL Tau: Revealing a compact molecular outflow
• Kinematics and the origin of the internal structures in HL Tau jet (HH 151)

Cited by in corpus (17)

• Global Simulations of the Inner Regions of Protoplanetary Disks with Comprehensive Disk Microphysics
• The dispersal of protoplanetary discs I: A new generation of X-ray photoevaporation models
• Nonsticky Ice at the Origin of the Uniformly Polarized Submillimeter Emission from the HL Tau Disk
• The determination of protoplanetary disk masses
• Magnetically Induced Disk Winds and Transport in the HL Tau Disk
• Dust Transport and Processing in Centrifugally Driven Protoplanetary Disk Winds
• The ALMA Early Science view of FUor/EXor objects. I. Through the looking-glass of V2775 Ori
• The ALMA Early Science View of FUor/EXor objects. II. The Very Wide Outflow Driven by HBC 494
• 1000 AU Exterior Arcs Connected to the Protoplanetary Disk around HL Tau
• The ALMA Early Science View of FUor/EXor objects. III. The Slow and Wide Outflow of V883 Ori
• Physical and Chemical Conditions of the Protostellar Envelope and the Protoplanetary Disk in HL Tau
• Modeling JWST MIRI-MRS Observations of T Cha: Mid-IR Noble Gas Emission Tracing a Dense Disk Wind
• Turbulent Disk Viscosity and the Bifurcation of Planet Formation Histories
• Signs of outflow feedback from a nearby young stellar object on the protostellar envelope around HL Tau
• A wind-driving disc model for the mm-wavelength polarization structure of HL Tau
• ALMA chemical survey of disk-outflow sources in Taurus (ALMA-DOT) VII: the layered molecular outflow from HL Tau and its relationship with the ringed disk
• The Kinematic and Dynamic Properties of HBC 494's Wide-Angle Outflows