2016A&A...586L...3C

Using the unprecedented combination of high resolution and sensitivity offered by ALMA, we aim to investigate whether and how hot corinos, circumstellar disks, and ejected gas are related in young solar-mass protostars. We observed CH₃CHO and deuterated water (HDO) high-excitation (E_u up to 335K) lines towards the Sun-like protostar HH212-MM1. For the first time, we have obtained images of CH₃CHO and HDO emission in the inner ≃100AU of HH212. The multifrequency line analysis allows us to contrain the density (≥10⁷cm^–3), temperature (≃100 K), and CH₃CHO abundance (≃0.2-2x10^–9) of the emitting region. The HDO profile is asymmetric at low velocities (≤2km/s from V_sys). If the HDO line is optically thick, this points to an extremely small (∼20-40AU) and dense (≥10⁹cm^–3) emitting region. We report the first detection of a hot corino in Orion. The HDO asymmetric profile indicates a contribution of outflowing gas from the compact central region, possibly associated with a dense disk wind.