The HDO abundance in the solar-type protostar IRAS 16293-2422

Caux, E., Parise, Berengere, Castets, A., Ceccarelli, C. and Tielens, A. 2005. The HDO abundance in the solar-type protostar IRAS 16293-2422. Presented at: The Cool Universe: Observing Cosmic Dawn, Valparaiso, Chile, 4-8 October 2004. Published in: Lidman, Christopher and Alloin, Danielle eds. The Cool Universe: Observing Cosmic Dawn: Proceedings of the 2004 IAOC Workshop held in Valparaiso, Chile, 4-8 October 2004. Cool Universe: Observing Cosmic Dawn. Astronomical Society of the Pacific conference series (344) San Francisco: Astronomical Society of the Pacific, pp. 206-211.

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Abstract

From JCMT and IRAM observations of five HDO lines towards the solar-type protostar IRAS 16293—2422, we derive the HDO abundance, x, and the deuteration ratio, f = HDO/H2O, in the warm inner part and in the cold outer part of the envelope. We find xHDOin = 1×10−7, xHDOout ≤ 1 × 10−9 (3σ), fin =3% and fout ≤ 0.2% (3σ). This is consistent with the formation of water in the gas phase during the cold prestellar core stage and with the storage of molecules on dust grains. The HDO enhancement is due to ice evaporation from the grains in the inner envelope.

Item Type:	Conference or Workshop Item (Paper)
Status:	Published
Schools:	Physics and Astronomy
Subjects:	Q Science > QB Astronomy
Publisher:	Astronomical Society of the Pacific
ISBN:	1583812113
Related URLs:	http://aspbooks.org/a/volumes/article_de... Publisher
Last Modified:	19 Mar 2016 09:42
URI:	https://orca.cardiff.ac.uk/id/eprint/52825

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