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Observations of higher-excited transitions of abundant molecules such as COare important for determining where energy in the form of shocks is fed backinto the parental envelope of forming stars. The nearby prototypical andprotobinary low-mass hot core, IRAS16293-2422 (I16293) is ideal for such astudy. The source was targeted with ALMA for science verification purposes inband 9, which includes CO J=6-5 (E_up/k_B ~ 116 K), at an unprecedented spatialresolution (~0.2", 25 AU). I16293 itself is composed of two sources, A and B,with a projected distance of 5". CO J=6-5 emission is detected throughout theregion, particularly in small, arcsecond-sized hotspots, where the outflowinteracts with the envelope. The observations only recover a fraction of theemission in the line wings when compared to data from single-dish telescopes,with a higher fraction of emission recovered at higher velocities. The veryhigh angular resolution of these new data reveal that a bow shock from source Acoincides, in the plane of the sky, with the position of source B. Source B, onthe other hand, does not show current outflow activity. In this region, outflowentrainment takes place over large spatial scales, >~ 100 AU, and in smalldiscrete knots. This unique dataset shows that the combination of ahigh-temperature tracer (e.g., CO J=6-5) and very high angular resolutionobservations is crucial for interpreting the structure of the warm innerenvironment of low-mass protostars.

ALMA CO J=6-5 observations of IRAS16293-2422: Shocks and entrainment