Detection of C3O in IRC +10216: Oxygen-carbon chain chemistry in the outer envelope

E. D. Tenenbaum; A. J. Apponi; L. M. Ziurys; M. Agúndez; J. Cernicharo; J. R. Pardo; M. Guélin

doi:10.1086/508166

Detection of C₃O in IRC +10216: Oxygen-carbon chain chemistry in the outer envelope

E. D. Tenenbaum, A. J. Apponi, L. M. Ziurys, M. Agúndez, J. Cernicharo, J. R. Pardo, M. Guélin

Research output: Contribution to journal › Article › peer-review

30 Scopus citations

Abstract

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 1-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.

Original language	English (US)
Pages (from-to)	L17-L20
Journal	Astrophysical Journal
Volume	649
Issue number	1 II
DOIs	https://doi.org/10.1086/508166
State	Published - Sep 20 2006

Keywords

Astrochemistry
Circumstellar matter
ISM: molecules
Radio lines: stars
Stars: carbon

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

Access to Document

10.1086/508166

Cite this

@article{f149927e5aaa4656bc87122389652a1f,

title = "Detection of C3O in IRC +10216: Oxygen-carbon chain chemistry in the outer envelope",

abstract = "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 1-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.",

keywords = "Astrochemistry, Circumstellar matter, ISM: molecules, Radio lines: stars, Stars: carbon",

author = "Tenenbaum, {E. D.} and Apponi, {A. J.} and Ziurys, {L. M.} and M. Ag{\'u}ndez and J. Cernicharo and Pardo, {J. R.} and M. Gu{\'e}lin",

note = "Funding Information: 1The Arizona Radio Observatory (ARO) is operated by Steward Observatory, University of Arizona, with partial support from the Research Corporation. Funding Information: This material is based on work supported by the National Aeronautics and Space Administration through the NASA Astrobiology Institute under Cooperative Agreement CAN-02-OSS-02 issued through the Office of Space Science. We also acknowledge support from Spanish MEC under project AYA2003-2785 and from “Comunidad de Madrid” under PRICIT project S-0505/ESP-0237 (ASTROCAM). E. D. T. thanks NSF for a graduate research fellowship, and M. A. acknowledges Spanish MEC for a predoctoral grant AP2003-4619.",

year = "2006",

month = sep,

day = "20",

doi = "10.1086/508166",

language = "English (US)",

volume = "649",

pages = "L17--L20",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "IOP Publishing Ltd.",

number = "1 II",

}

TY - JOUR

T1 - Detection of C3O in IRC +10216

T2 - Oxygen-carbon chain chemistry in the outer envelope

AU - Tenenbaum, E. D.

AU - Apponi, A. J.

AU - Ziurys, L. M.

AU - Agúndez, M.

AU - Cernicharo, J.

AU - Pardo, J. R.

AU - Guélin, M.

N1 - Funding Information: 1The Arizona Radio Observatory (ARO) is operated by Steward Observatory, University of Arizona, with partial support from the Research Corporation. Funding Information: This material is based on work supported by the National Aeronautics and Space Administration through the NASA Astrobiology Institute under Cooperative Agreement CAN-02-OSS-02 issued through the Office of Space Science. We also acknowledge support from Spanish MEC under project AYA2003-2785 and from “Comunidad de Madrid” under PRICIT project S-0505/ESP-0237 (ASTROCAM). E. D. T. thanks NSF for a graduate research fellowship, and M. A. acknowledges Spanish MEC for a predoctoral grant AP2003-4619.

PY - 2006/9/20

Y1 - 2006/9/20

N2 - 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 1-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.

AB - 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 1-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.

KW - Astrochemistry

KW - Circumstellar matter

KW - ISM: molecules

KW - Radio lines: stars

KW - Stars: carbon

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U2 - 10.1086/508166

DO - 10.1086/508166

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SP - L17-L20

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1 II

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