Discovery of SiCSi in IRC+10216: A missing link between gas and dust carriers of Si-C bonds

J. Cernicharo, M. C. McCarthy, C. A. Gottlieb, M. Agúndez, L. Velilla Prieto, J. H. Baraban, P. B. Changala, M. Guélin, C. Kahane, M. A. Martin-Drumel, N. A. Patel, N. J. Reilly, J. F. Stanton, G. Quintana-Lacaci, S. Thorwirth, K. H. Young

Research output: Contribution to journalArticlepeer-review

75 Scopus citations


We report the discovery in space of a disilicon species, SiCSi, from observations between 80 and 350 GHz with the IRAM 30 m radio telescope. Owing to the close coordination between laboratory experiments and astrophysics, 112 lines have now been detected in the carbon-rich star CW Leo. The derived frequencies yield improved rotational and centrifugal distortion constants up to sixth order. From the line profiles and interferometric maps with the Submillimeter Array, the bulk of the SiCSi emission arises from a region of 6″ in radius. The derived abundance is comparable to that of SiC2. As expected from chemical equilibrium calculations, SiCSi and SiC2 are the most abundant species harboring a Si-C bond in the dust formation zone and certainly both play a key role in the formation of SiC dust grains.

Original languageEnglish
Article numberL3
JournalAstrophysical Journal Letters
Issue number1
StatePublished - 10 Jun 2015
Externally publishedYes


  • astrochemistry
  • stars: AGB and post-AGB
  • stars: carbon
  • stars: individual (IRC 10216)

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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