Volume 410, Number 3, November II 2003
|Page(s)||897 - 904|
|Section||Interstellar and circumstellar matter|
|Published online||17 November 2003|
Search for solid HDO in low-mass protostars
CESR CNRS-UPS, BP 4346, 31028 Toulouse Cedex 04, France
2 Institute for Astronomy, 2680 Woodlawn Drive, Honolulu, HI 96822, USA
3 IAS-CNRS, Bât. 121, Université Paris Sud, 91405 Orsay Cedex, France
4 Laboratoire d'Astrophysique, Observatoire de Grenoble, BP 53, 38041 Grenoble Cedex 09, France
5 SRON, PO Box 800, 9700 AV Groningen, The Netherlands
Corresponding author: B. Parise, Parise@cesr.fr
Accepted: 11 August 2003
We present ground-based 2.1 to 4.2 μm observations of four low-mass protostars. We searched for the 4.1 μm OD stretch band, characteristic of solid HDO in grain mantles. We did not detect solid HDO in any of the four sources, but we derive 3σ upper limits from 0.5% to 2% for the HDO/H2O ratio depending on the source. These ratios provide strong constraints to solid-state deuteration models when compared to deuterium fractionation values observed in the gas phase. We discuss various scenarios that could lead to such a low water deuteration compared to the high formaldehyde and methanol deuteration observed in the gas-phase.
Key words: astrochemistry / ISM: abundances, molecules, lines and bands / stars: formation / individual objects: NGC 1333 SVS12, SVS13, L1489 IRS, TMR1
© ESO, 2003
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