ALMA observations and modeling of the rotating outflow in Orion Source I

Abstract

We present ${}^{29}$SiO(J=8--7) $\nu$=0, SiS (J=19--18) $\nu$=0, and ${}^{28}$SiO (J=8--7) $\nu$=1 molecular line archive observations made with the Atacama Large Millimeter/Submillimeter Array (ALMA) of the molecular outflow associated with Orion Source I. The observations show velocity asymmetries about the flow axis which are interpreted as outflow rotation. We find that the rotation velocity ($\sim$4--8 km s${}^{-1}$) decreases with the vertical distance to the disk. In contrast, the cylindrical radius ($\sim$100--300 au), the expansion velocity ($\sim$2--15 km s${}^{-1}$), and the axial velocity $v_{\mathrm{z}}$ ($\sim$-1--10 km s${}^{-1}$) increase with the vertical distance. The mass estimated of the molecular outflow ${\mathrm{M}}_{\mathrm{outflow}}\sim$0.66--1.3 M${}_{\odot }$. Given a kinematic time $\sim$130 yr, this implies a mass loss rate ${\dot{\mathrm{M}}}_{\mathrm{outflow}}\sim 5.1-10\times 10^{-3}$ M${}_{\odot }$ yr${}^{-1}$. This massive outflow sets important contraints on disk wind models. We compare the observations with a model of a shell produced by the interaction between an anisotropic stellar wind and an Ulrich accretion flow that corresponds to a rotating molecular envelope in collapse. We find that the model cylindrical radii are consistent with the ${}^{29}$SiO(J=8--7) $\nu$=0 data. The expansion velocities and the axial velocities of the model are similar the observed values, except close to the disk ($z\sim \pm$150 au) for the expansion velocity. Nevertheless, the rotation velocities of the model are a factor $\sim$3--10 lower than the observed values. We conclude that the Ulrich flow alone cannot explain the rotation observed and other possibilities should be explored, like the inclusion of the angular momentum of a disk wind.

References in corpus (38)

• The Disk Population of the Taurus Star-Forming Region
• A dual-frequency sub-arcsecond study of proto-planetary disks at mm wavelengths: First evidence for radial variations of the dust properties
• IRAC Observations of Taurus Pre-Main Sequence Stars
• Global simulations of protoplanetary disks with net magnetic flux: I. Non-ideal MHD case
• The Birth of High Mass Stars: Accretion and/or Mergers?
• Locating the Launching Region of T Tauri Winds: The Case of DG Tau
• Disk-Driven Rotating Bipolar Outflow in Orion Source I
• ALMA discovery of a rotating SO/SO${}_2$ flow in HH212. A possible MHD disk wind?
• The HH30 edge-on T Tauri star A rotating and precessing monopolar outflow scrutinized by ALMA
• Global Simulations of Protoplanetary Disk Outflows with Coupled Non-ideal Magnetohydrodynamics and Consistent Thermochemistry
• Monitoring the Large Proper Motions of Radio Sources in the Orion BN/KL Region
• Rotation and Outflow motions in the very low-mass Class 0 protostellar system HH 211 at subarcsecond resolution
• Explosive Disintegration of a Massive Young Stellar System in Orion
• Connection between jets, winds and accretion in T Tauri stars: the X-shooter view
• Hall-effect Mediated Magnetic Flux Transport in Protoplanetary Disks
• ALMA reveals a large structured disk and nested rotating outflows in DG Tau B
• The ALMA View of the OMC1 Explosion in Orion
• Rotating molecular outflows: the young T Tauri star in CB26
• A Multi-Epoch Study of the Radio Continuum Emission of Orion Source I: Constraints on the Disk Evolution of a Massive YSO and the Dynamical History of Orion BN/KL
• The outflow history of two Herbig-Haro jets in RCW 36: HH 1042 and HH 1043
• Tracing the Bipolar Outflow from Orion Source I
• A Keplerian disk around Orion Source I, a ~15 Msun YSO
• Imaging the Ionized Disk of the High-Mass Protostar Orion-I
• Forming an Early O-type Star Through Gas Accretion?
• Rotation in the NGC 1333 IRAS 4C Outflow
• Dynamical Evidence for a Magnetocentrifugal Wind from a 20 Msun Binary Young Stellar Object
• ALMA Observations of Orion Source I at 350 and 660 GHz
• Hot Molecular Circumstellar Disk around Massive Protostar Orion Source I
• Kinematics of the Outflow From The Young Star DG Tau B: Rotation in the vicinities of an optical jet
• The near-infrared reflected spectrum of source I in Orion-KL
• ALMA observations of the outflow from the Source I in the Orion-KL region
• A rotating molecular jet in Orion
• A rotating molecular jet from a Perseus protostar
• The Proper Motions of the Double Radio Source n in the Orion BN/KL Region
• New Evidence for the Dynamical Decay of a Multiple System in the Orion Kleinmann-Low Nebula
• Molecular outflows: Explosive versus protostellar
• First VLBI mapping of circumstellar 29SiO maser emission
• Angular momentum in bipolar outflows: dynamical evolutionary model

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