Heavy water around the L1448-mm protostar
C. Codella, C. Ceccarelli, B. Nisini, R. Bachiller, J. Cernicharo, F., Gueth, A. Fuente, B. Lefloch

TL;DR
This study images and analyzes heavy water (HDO) emission around the L1448-mm protostar, revealing its distribution and suggesting HDO formation in shocked regions rather than solely in hot corinos.
Contribution
First imaging of HDO emission around L1448-mm, showing its spatial distribution and proposing shock regions as HDO formation sites.
Findings
HDO emission is centered near the protostar's dust-heated region.
Tentative weaker HDO emission detected near the outflow cavity walls.
Derived HDO abundance of approximately 4×10^-7 in the hot-corino region.
Abstract
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…
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Taxonomy
TopicsAstro and Planetary Science · Planetary Science and Exploration · Astrophysics and Star Formation Studies
