Volume 586, February 2016
|Number of page(s)||5|
|Published online||25 January 2016|
Water and acetaldehyde in HH212: The first hot corino in Orion
INAF, Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5x,
2 Univ. Grenoble Alpes, Institut de Planétologie et d’Astrophysique de Grenoble (IPAG), 38401 Grenoble, France
3 CNRS, Institut de Planétologie et d’Astrophysique de Grenoble (IPAG), 38401 Grenoble, France
4 LERMA, UMR 8112 du CNRS, Observatoire de Paris, École Normale Supérieure, 61 Av. de l’Observatoire, 75014 Paris, France
5 IRAM, 300 rue de la Piscine, 38406 Saint Martin d’Hères, France
6 IGN, Observatorio Astronómico Nacional, Alfonso XII 3, 28014 Madrid, Spain
7 Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
Received: 22 September 2015
Accepted: 18 December 2015
Aims. 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.
Methods. We observed CH3CHO and deuterated water (HDO) high-excitation (Eu up to 335 K) lines towards the Sun-like protostar HH212−MM1.
Results. For the first time, we have obtained images of CH3CHO and HDO emission in the inner ≃100 AU of HH212. The multifrequency line analysis allows us to contrain the density (≥107 cm-3), temperature (≃100 K), and CH3CHO abundance (≃0.2−2 × 10-9) of the emitting region. The HDO profile is asymmetric at low velocities (≤2 km s-1 from Vsys). If the HDO line is optically thick, this points to an extremely small (~20−40 AU) and dense (≥109 cm-3) emitting region.
Conclusions. 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.
Key words: stars: formation / ISM: jets and outflows / ISM: molecules / ISM: individual objects
© ESO, 2016
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.