The HDO Abundance in the Solar-Type Protostar IRAS 16293-2422

Details The HDO Abundance in the Solar-Type Protostar IRAS 16293-2422 The HDO Abundance in the Solar-Type Protostar IRAS 16293-2422

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aspc..344..206c&link_type=abstract

The Cool Universe: Observing Cosmic Dawn, ASP Conference Series, Vol. 344, Proceedings of the conference held 4-8 October, 2004

Astronomy and Astrophysics

Astronomy

1

Scientific paper

From JCMT (James Clerk Maxwell Telescope) 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 xHDO_in = 1×10-7, xHDO_out ≤ 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.

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