Cernicharo, J., Waters, L. B. F. M., Decin, L., Encrenaz, P., Tielens, A. G. G. M., Agundez, M., De Beck, E., Mueller, H. S. P., Goicoechea, J. R., Barlow, M. J., Benz, A., Crimier, N., Daniel, F., Di Giorgio, A. M., Fich, M., Gaier, T., Garcia-Lario, P., de Koter, A., Khouri, T., Liseau, R., Lombaert, R., Erickson, N., Pardo, J. R., Pearson, J. C., Shipman, R., Sanchez Contreras, C. and Teyssier, D. (2010). A high-resolution line survey of IRC+10216 with Herschel/HIFI First results: Detection of warm silicon dicarbide (SiC2). Astron. Astrophys., 521. LES ULIS CEDEX A: EDP SCIENCES S A. ISSN 1432-0746

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Abstract

We present the first results of a high-spectral-resolution survey of the carbon-rich evolved star IRC+10216 that was carried out with the HIFI spectrometer onboard Herschel. This survey covers all HIFI bands, with a spectral range from 488 to 1901 GHz. In this letter we focus on the band-1b spectrum, in a spectral range 554.5-636.5 GHz, where we identified 130 spectral features with intensities above 0.03 K and a signal-to-noise ratio >5. Detected lines arise from HCN, SiO, SiS, CS, CO, metal-bearing species and, surprisingly, silicon dicarbide (SiC2). We identified 55 SiC2 transitions involving energy levels between 300 and 900 K. By analysing these rotational lines, we conclude that SiC2 is produced in the inner dust formation zone, with an abundance of similar to 2 x 10(-7) relative to molecular hydrogen. These SiC2 lines have been observed for the first time in space and have been used to derive an SiC2 rotational temperature of similar to 204 K and a source-averaged column density of similar to 6.4 x 10(15) cm(-2). Furthermore, the high quality of the HIFI data set was used to improve the spectroscopic rotational constants of SiC2.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Cernicharo, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Waters, L. B. F. M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Decin, L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Encrenaz, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Tielens, A. G. G. M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Agundez, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
De Beck, E.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Mueller, H. S. P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Goicoechea, J. R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Barlow, M. J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Benz, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Crimier, N.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Daniel, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Di Giorgio, A. M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Fich, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gaier, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Garcia-Lario, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
de Koter, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Khouri, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Liseau, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lombaert, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Erickson, N.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Pardo, J. R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Pearson, J. C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Shipman, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Sanchez Contreras, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Teyssier, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-494736
DOI: 10.1051/0004-6361/201015150
Journal or Publication Title: Astron. Astrophys.
Volume: 521
Date: 2010
Publisher: EDP SCIENCES S A
Place of Publication: LES ULIS CEDEX A
ISSN: 1432-0746
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
SUBMILLIMETER HCN LASER; DUST FORMATION ZONE; MOLECULAR-SPECTROSCOPY; LABORATORY MEASUREMENT; BURE OBSERVATIONS; COLOGNE DATABASE; ENVELOPE; CHEMISTRY; EMISSION; COMultiple languages
Astronomy & AstrophysicsMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/49473

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