Search for solid HDO in low-mass protostars

Details Search for solid HDO in low-mass protostars Search for solid HDO in low-mass protostars

2003-09-15

arxiv.org/abs/astro-ph/0309401v1

Astron.Astrophys.410:897-904,2003

Astronomy and Astrophysics

Astrophysics

8 pages, 6 figures Accepted for publication in A&A

Scientific paper

10.1051/0004-6361:20031277

We present ground-based 2.1 to 4.2 microns observations of four low-mass protostars. We searched for the 4.1 microns 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/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.

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