Discovery of the first Ca-bearing molecule in space: CaNC

• Published in: Astronomy and astrophysics (Berlin) Vol. 627; p. L4
• Main Authors: Cernicharo, J., Velilla-Prieto, L., Agúndez, M., Pardo, J. R., Fonfría, J. P., Quintana-Lacaci, G., Cabezas, C., Bermúdez, C., Guélin, M.
• Format: Journal Article
• Language: English
• Published: Germany EDP Sciences 01.07.2019
• Subjects: astrochemistry; circumstellar matter; line: identification; molecular data; stars: carbon; stars: individual: IRC+10216; stars: carbon; line: identification; molecular data; astrochemistry; circumstellar matter; stars: individual (IRC +10216)
• ISSN: 0004-6361; 1432-0746; 1432-0746
• DOI: 10.1051/0004-6361/201936040

We report on the detection of calcium isocyanide, CaNC, in the carbon-rich evolved star IRC+10216. We derived a column density for this species of (2 ± 0.5) × 1011 cm−2. Based on the observed line profiles and the modelling of its emission through the envelope, the molecule has to be produced in the intermediate and outer layers of the circumstellar envelope where other metal-isocyanides have previously been found in this source. The abundance ratio of CaNC relative to MgNC and FeCN is ≃1/60 and ≃1, respectively. We searched for the species CaF, CaCl, CaC, CaCCH, and CaCH3 for which accurate frequency predictions are available. Only upper limits have been obtained for these molecules.