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Warm water vapour in the sooty outflow from a luminous carbon star

Decin, L., Agúndez, M., Barlow, M. J., Daniel, F., Cernicharo, J., Lombaert, R., De Beck, E., Royer, P., Vandenbussche, B., Wesson, R., Polehampton, E. T., Blommaert, J. A. D. L., De Meester, W., Exter, K., Feuchtgruber, H., Gear, Walter Kieran ORCID:, Gomez, Haley Louise ORCID:, Groenewegen, M. A. T., Guélin, M., Hargrave, Peter Charles ORCID:, Huygen, R., Imhof, P., Ivison, R. J., Jean, C., Kahane, C., Kerschbaum, F., Leeks, S. J., Lim, T., Matsuura, Mikako ORCID:, Olofsson, G., Posch, T., Regibo, S., Savini, G., Sibthorpe, B., Swinyard, B. M., Yates, J. A. and Waelkens, C. 2010. Warm water vapour in the sooty outflow from a luminous carbon star. Nature 467 (7311) , pp. 64-67. 10.1038/nature09344

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The detection of circumstellar water vapour around the ageing carbon star IRC +10216 challenged the current understanding of chemistry in old stars, because water was predicted to be almost absent in carbon-rich stars. Several explanations for the water were postulated, including the vaporization of icy bodies (comets or dwarf planets) in orbit around the star1, grain surface reactions, and photochemistry in the outer circumstellar envelope. With a single water line detected so far from this one carbon-rich evolved star, it is difficult to discriminate between the different mechanisms proposed. Here we report the detection of dozens of water vapour lines in the far-infrared and sub-millimetre spectrum of IRC +1021 using the Herschel satellite. This includes some high-excitation lines with energies corresponding to ~1,000 K, which can be explained only if water is present in the warm inner sooty region of the envelope. A plausible explanation for the warm water appears to be the penetration of ultraviolet photons deep into a clumpy circumstellar envelope. This mechanism also triggers the formation of other molecules, such as ammonia, whose observed abundances6 are much higher than hitherto predicted.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Publisher: EDP Sciences
ISSN: 0028-0836
Last Modified: 17 Oct 2022 10:11

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