Barn 335 ALMA datacubes

We also combined our long-baseline data with archival observations to produce a high-fidelity image covering scales up to 700 au (7"). ^12^CO has an X-shaped morphology with arms ~50au in width that we associate with the walls of an outflow cavity, similar to what is observed on larger scales. Long-baseline continuum emission is confined to <7au from the protostar, while short- baseline continuum emission follows the ^12^CO outflow and cavity walls.

Methanol is detected within ~30au of the protostar. SiO is also detected in the vicinity of the protostar, but extended along the outflow. The ^12^CO outflow does not show any clear signs of rotation at distances >=30au from the protostar.

SiO traces the protostellar jet on small scales, but without obvious rotation. CH_3_OH and SO_2_ trace a region <16au in diameter, centred on the continuum peak, which is clearly rotating. Using episodic, high-velocity, ^12^CO features, we estimate the launching radius of the outflow to be<0.1au and dynamical timescales of the order of a few years.