Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics
Scientific paper
2010-10-19
Astronomy and Astrophysics
Astrophysics
Galaxy Astrophysics
Accepted by A&A as Letter; 5 pages, 3 figures
Scientific paper
Context: L1448-mm is the prototype of a low-mass Class 0 protostar driving a high-velocity jet. Given its bright H2O spectra observed with ISO, L1448-mm is an ideal laboratory to observe heavy water (HDO) emission. Aims: Our aim is to image the HDO emission in the protostar surroundings, the possible occurrence of HDO emission also investigating off L1448-mm, towards the molecular outflow. Methods: We carried out observations of L1448-mm in the HDO(1_10-1_11) line at 80.6 GHz, an excellent tracer of HDO column density, with the IRAM Plateau de Bure Interferometer. Results: We image for the first time HDO emission around L1448-mm. The HDO structure reveals a main clump at velocities close to the ambient one towards the the continuum peak that is caused by the dust heated by the protostar. In addition, the HDO map shows tentative weaker emission at about 2000 AU from the protostar towards the south, which is possibly associated with the walls of the outflow cavity opened by the protostellar wind. Conclusions: Using an LVG code, modelling the density and temperature profile of the hot-corino, and adopting a gas temperature of 100 K and a density of 1.5 10^8 cm^-3, we derive a beam diluted HDO column density of about 7 10^13 cm^-2, corresponding to a HDO abundance of about 4 10^-7. In addition, the present map supports the scenario where HDO can be efficiently produced in shocked regions and not uniquely in hot corinos heated by the newly born star.
Bachiller Rafael
Ceccarelli Cecilia
Cernicharo Jose
Codella Claudio
Fuente Asuncion
No associations
LandOfFree
Heavy water around the L1448-mm protostar does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Heavy water around the L1448-mm protostar, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Heavy water around the L1448-mm protostar will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-269659