EDP Sciences
Free access
Volume 410, Number 3, November II 2003
Page(s) 897 - 904
Section Formation, structure and evolution of stars
DOI http://dx.doi.org/10.1051/0004-6361:20031277

A&A 410, 897-904 (2003)
DOI: 10.1051/0004-6361:20031277

Search for solid HDO in low-mass protostars

B. Parise1, T. Simon2, E. Caux1, E. Dartois3, C. Ceccarelli4, J. Rayner2 and A. G. G. M. Tielens5

1  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

(Received 21 May 2003 / Accepted 11 August 2003)

We present ground-based 2.1 to 4.2  $\mu$m observations of four low-mass protostars. We searched for the 4.1  $\mu$m 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 3 $\sigma$ upper limits from 0.5% to 2% for the HDO/H 2O 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

Offprint request: B. Parise, Parise@cesr.fr

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