Detection of C3O in IRC +10216: Oxygen-Carbon Chain Chemistry in the Outer Envelope

Details Detection of C3O in IRC +10216: Oxygen-Carbon Chain Chemistry in the Outer Envelope Detection of C3O in IRC +10216: Oxygen-Carbon Chain Chemistry in the Outer Envelope

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006apj...649l..17t&link_type=abstract

The Astrophysical Journal, Volume 649, Issue 1, pp. L17-L20.

Astronomy and Astrophysics

Astronomy

12

Astrochemistry, Stars: Circumstellar Matter, Ism: Molecules, Radio Lines: Stars, Stars: Carbon, Stars: Individual: Alphanumeric: Irc +10216

Scientific paper

The oxygen-bearing species C3O has been identified in the circumstellar envelope of the carbon star IRC +10216. The J=8-->7, 9-->8, 10-->9, 14-->13, and 15-->14 transitions were detected at 2 and 3 mm using the Arizona Radio Observatory's 12 m telescope. Measurements of the J=9-->8, 10-->9, and 12-->11 lines were simultaneously conducted at the IRAM 30 m telescope. The line profiles of C3O are roughly U-shaped, indicating an extended shell distribution for this molecule in IRC +10216. The total column density derived for C3O is 1.2×1012 cm-2, at least an order of magnitude higher than that predicted by current chemical models. However, a revised model that includes reactions of atomic oxygen with carbon-chain radicals, such as l-C3H and C4, can reproduce the observed abundance. This model also predicts that C3O arises from a shell source with an outer radius near r~30'', consistent with the observations. These results suggest that gas phase neutral-neutral chemistry may be producing the oxygen-bearing molecules present in the outer envelope of IRC +10216.

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