Detection of C5N− and Vibrationally Excited C6H in IRC +10216

By J. Cernicharo, M. Guélin, M. Agúndez, Michael C. McCarthy, P. Thaddeus. 2008

164 citations recorded by the source corpus.

We report the detection in the envelope of the C-rich star IRC +10216 of four series of lines with harmonically related frequencies: B1389, B1390, B1394, and B1401. The four series must arise from linear molecules with mass and size close to those of C6H and C5N. Three of the series have half-integer rotational quantum numbers; we assign them to the 2Δ and 2Σ− vibronic states of C6H in its lowest (ν11) bending mode. The fourth series, B1389, has integer J with no evidence of fine or hyperfine structure; it has a rotational constant of 1388.860(2) MHz and a centrifugal distortion constant of 33(1) Hz; it is almost certainly the C5N− anion.

Subfields: Astronomy and Astrophysics, Instrumentation

View Paper: https://www.semanticscholar.org/paper/00f6a597fef6537ebdaba0d8b41b3a808c2456d1

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In Astronomy and Astrophysics

1. B. McGuire
2. J. Cernicharo
3. J. Plane
4. A. Sarangi
5. D. Gobrecht
6. S. Bromley
7. Michael C. McCarthy
8. P. Thaddeus

In Instrumentation

1. B. McGuire
2. D. Gobrecht

Citations in the corpus

• Dust formation in the oxygen-rich AGB star IK Tauri (2015, background): “…of molecules, and many gas-phase species have been identified close to the stellar surface in both oxygen- and carbon-rich AGBs by various observing facilities, including most recently Herschel (e.g., Cernicharo et al. 2008; Groenewegen et al. 2011; Schoïer et al. 2011; Justtanont et al. 2012).”
• Astronomical identification of CN^-, the smallest observed molecular anion (2010, methodology): “Following our initial detection in IRC+10216 of aT ∗A ∼ 3 mK line at the frequency of theJ = 1-0 transition of C2H− (Cernicharo et al., 2008), we searched from January to April 2010 for theJ = 2-1 transition at 166.5 GHz.”
• 2018 Census of Interstellar, Circumstellar, Extragalactic, Protoplanetary Disk, and Exoplanetary Molecules (2018, background): “C5N– (cyanobutadiynyl anion) Cernicharo et al. (2008) reported the detection of C5N– in IRAM 30-m observations of IRC+10216.”