Dynamical Evidence for a Magnetocentrifugal Wind from a 20 Msun Binary Young Stellar Object

Abstract

In Orion BN/KL, proper motions of 7 mm vibrationally-excited SiO masers trace rotation of a nearly edge-on disk and a bipolar wide-angle outflow 10-100 AU from radio Source I, a binary young stellar object (YSO) of ~20 Msun. Here we map ground-state 7 mm SiO emission with the Very Large Array and track proper motions over 9 years. The innermost and strongest emission lies in two extended arcs bracketing Source I. The proper motions trace a northeast-southwest bipolar outflow 100-1000 AU from Source I with a median 3D motion of ~18 km/s. An overlying distribution of 1.3 cm H2O masers betrays similar flow characteristics. Gas dynamics and emission morphology traced by the masers suggest the presence of a magnetocentrifugal disk-wind. Reinforcing evidence lies in the colinearity of the flow, apparent rotation across the flow parallel to the disk rotation, and recollimation that narrows the flow opening angle ~120 AU downstream. The arcs of ground-state SiO emission may mark the transition point to a shocked super-Alfvenic outflow.

7 pages, 4 figures, and 1 table. Accepted for publication in ApJ Letters

References in corpus (7)

• Imaging the Ionized Disk of the High-Mass Protostar Orion-I
• ALMA observations of the outflow from the Source I in the Orion-KL region
• Outflow Structure and Velocity Field of Orion Source I: ALMA Imaging of SiO Isotopologue Maser and Thermal Emission
• Sputtering in oblique C-type shocks
• The Ionized Circumstellar Envelopes of Orion Source I and the Becklin Neugebauer Object
• MHD Modeling of a Disk-Wind from a High-Mass Protobinary: the case of Orion Source I
• Keck Adaptive Optics Observations of the Protostellar Disk around Radio Source I in the Orion Kleinmann-Low Nebula

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• Observations of Orion Source I Disk and Outflow Interface
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• Quantifying the high early solar cosmic ray flux with cosmogenic neon isotopes in refractory minerals
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