The ALMA Early Science View of FUor/EXor objects. III. The Slow and Wide Outflow of V883 Ori

Abstract

We present Atacama Large Millimeter/ sub-millimeter Array (ALMA) observations of V883 Ori, an FU Ori object. We describe the molecular outflow and envelope of the system based on the ${}^{12}$CO and ${}^{13}$CO emissions, which together trace a bipolar molecular outflow. The C${}^{18}$O emission traces the rotational motion of the circumstellar disk. From the ${}^{12}$CO blue-shifted emission, we estimate a wide opening angle of $\sim$ 150${}^{{}^{\circ }}$ for the outflow cavities. Also, we find that the outflow is very slow (characteristic velocity of only 0.65 km~s${}^{-1}$), which is unique for an FU Ori object. We calculate the kinematic properties of the outflow in the standard manner using the ${}^{12}$CO and ${}^{13}$CO emissions. In addition, we present a P Cygni profile observed in the high-resolution optical spectrum, evidence of a wind driven by the accretion and being the cause for the particular morphology of the outflows. We discuss the implications of our findings and the rise of these slow outflows during and/or after the formation of a rotationally supported disk.

12 pages, 7 figures, 2 tables. Accepted

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• Chemically tracing the water snowline in protoplanetary disks with HCO${}^{+}$
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• Early Planet Formation in Embedded Disks (eDisk). IV. The Ringed and Warped Structure of the Disk around the Class I Protostar L1489 IRS
• Diagnosing FUor-like Sources: The Parameter Space of Viscously Heated Disks in the Optical and Near-IR
• On the rise times in FU Orionis events
• Sustained FU Orionis-type outbursts from colliding discs in stellar flybys
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• Molecular Mapping of DR Tau's Protoplanetary Disk, Envelope, Outflow, and Large-Scale Spiral Arm
• Expanding CO Shells in the Orion A Molecular Cloud
• Spectral evolution and radial dust transport in the prototype young eruptive system EX Lup
• ALMA Observations of Young Eruptive Stars: continuum disk sizes and molecular outflows
• An ALMA Study of the FU-Ori Type Object V900 Mon: Implications for the Progenitor
• A Chemical Map of the Outbursting V883 Ori system: Vertical and Radial Structures
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• APEX Observations of the CO Envelope around the Young FUor-type Star V883 Ori
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• Infrared and sub-mm observations of outbursting young stars with Herschel and Spitzer