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

## TL;DR

This paper reports ALMA observations of V883 Ori, revealing a slow, wide-angle bipolar outflow and a rotating disk, with implications for understanding outflow evolution during star formation.

## Contribution

It provides the first detailed characterization of a slow, wide-angle outflow in an FU Ori object, linking outflow properties to accretion-driven winds.

## Key findings

- Outflow has a wide opening angle of ~150 degrees.
- Outflow velocity is very slow at 0.65 km/s.
- Optical spectrum shows a P Cygni profile indicating a wind.

## 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.