Formaldehyde in IRC+10216: Chemistry of an Extrasolar Cometary System

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The detection of water vapor (Melnick et al. 2001) and OH (Ford et al. 2003) around the carbon-rich AGB star, IRC+10216, has been interpreted as evidence for the existence of an extrasolar cometary system orbiting IRC+10216. This interpretation is based on the expectation that no oxygen-bearing molecules other than CO, and small amounts of SiO and HCO+, would be found in such a carbon-rich environment. The cometary system in IRC+10216, analogous to the Solar System's Kuiper Belt, should be the source of all oxygen-bearing molecules other than CO, SiO or HCO+ detected around the star. We report the detection of formaldehyde (H2CO) in the circumstellar envelope of IRC+10126, based on observations with the IRAM 30-m telescope. I will discuss what these observations can tell us about the chemical composition and spatial distribution of this extrasolar cometary system.

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