2024ApJ...974..150W

We present Atacama Large Millimeter/submillimeter Array observations of SiO, SiS, H₂O, NaCl, and SO line emission at ∼30-50 mas resolution. These images map the molecular outflow and disk of Orion Source I (SrcI) on ∼12-20 au scales. Our observations show that the flow of material around SrcI creates a turbulent boundary layer in the outflow from SrcI, which may dissipate angular momentum in the rotating molecular outflow into the surrounding medium. Additionally, the data suggest that the proper motion of SrcI may have a significant effect on the structure and evolution of SrcI and its molecular outflow. As the motion of SrcI funnels material between the disk and the outflow, some material may be entrained into the outflow and accrete onto the disk, creating shocks that excite the NaCl close to the disk surface.