Vastel, C., Ceccarelli, C., Caux, E., Coutens, A., Cernicharo, J., Bottinelli, S., Demyk, K., Faure, A., Wiesenfeld, L., Scribano, Y., Bacmann, A., Hily-Blant, P., Maret, S., Walters, A., Bergin, E. A., Blake, G. A., Castets, A., Crimier, N., Dominik, C., Encrenaz, P., Gerin, M., Hennebelle, P., Kahane, C., Klotz, A., Melnick, G., Pagani, L., Parise, B., Schilke, P., Wakelam, V., Baudry, A., Bell, T., Benedettini, M., Boogert, A., Cabrit, S., Caselli, P., Codella, C., Comito, C., Falgarone, E., Fuente, A., Goldsmith, P. F., Helmich, F., Henning, T., Herbst, E., Jacq, T., Kama, M., Langer, W., Lefloch, B., Lis, D., Lord, S., Lorenzani, A., Neufeld, D., Nisini, B., Pacheco, S., Pearson, J., Phillips, T., Salez, M., Saraceno, P., Schuster, K., Tielens, X., van der Tak, F., van der Wiel, M. H. D., Viti, S., Wyrowski, F., Yorke, H., Cais, P., Krieg, J. M., Olberg, M. and Ravera, L. (2010). Ortho-to-para ratio of interstellar heavy water. Astron. Astrophys., 521. LES ULIS CEDEX A: EDP SCIENCES S A. ISSN 0004-6361

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Abstract

Context. Despite the low elemental deuterium abundance in the Galaxy, enhanced molecular D/H ratios have been found in the environments of low-mass star-forming regions, and in particular the Class 0 protostar IRAS 16293-2422. Aims. The CHESS (Chemical HErschel Surveys of Star forming regions) key program aims to study the molecular complexity of the interstellar medium. The high sensitivity and spectral resolution of the Herschel/HIFI instrument provide a unique opportunity to observe the fundamental 1(1,1)-0(0,0) transition of the ortho-D2O molecule, which is inaccessible from the ground, and determine the ortho-to-para D2O ratio. Methods. We detected the fundamental transition of the ortho-D2O molecule at 607.35 GHz towards IRAS 16293-2422. The line is seen in absorption with a line opacity of 0.62 +/- 0.11 (1 sigma). From the previous ground-based observations of the fundamental 1(1,0)-1(0,1) transition of para-D2O seen in absorption at 316.80 GHz, we estimate a line opacity of 0.26 +/- 0.05 (1 sigma). Results. We show that the observed absorption is caused by the cold gas in the envelope of the protostar. Using these new observations, we estimate for the first time the ortho-to-para D2O ratio to be lower than 2.6 at a 3 sigma level of uncertainty, which should be compared with the thermal equilibrium value of 2:1.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Vastel, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ceccarelli, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Caux, E.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Coutens, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Cernicharo, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bottinelli, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Demyk, K.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Faure, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wiesenfeld, L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Scribano, Y.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bacmann, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hily-Blant, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Maret, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Walters, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bergin, E. A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Blake, G. A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Castets, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Crimier, N.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Dominik, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Encrenaz, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gerin, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hennebelle, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kahane, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Klotz, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Melnick, G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Pagani, L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Parise, B.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schilke, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wakelam, V.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Baudry, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bell, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Benedettini, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Boogert, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Cabrit, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Caselli, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Codella, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Comito, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Falgarone, E.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Fuente, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Goldsmith, P. F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Helmich, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Henning, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Herbst, E.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Jacq, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kama, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Langer, W.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lefloch, B.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lis, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lord, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lorenzani, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Neufeld, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Nisini, B.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Pacheco, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Pearson, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Phillips, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Salez, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Saraceno, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schuster, K.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Tielens, X.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
van der Tak, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
van der Wiel, M. H. D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Viti, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wyrowski, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Yorke, H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Cais, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Krieg, J. M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Olberg, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ravera, L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-495079
DOI: 10.1051/0004-6361/201015101
Journal or Publication Title: Astron. Astrophys.
Volume: 521
Date: 2010
Publisher: EDP SCIENCES S A
Place of Publication: LES ULIS CEDEX A
ISSN: 0004-6361
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
PROTOSTAR IRAS 16293-2422; SPECTROSCOPY; CONSTRAINTS; ENVELOPEMultiple languages
Astronomy & AstrophysicsMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/49507

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