Detection of C5N- and vibrationally excited C6H in IRC +10216

Abstract

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 2Delta and 2Sigma vibronic states of C6H in its lowest (v_11) 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.

arXiv commentAccepted for publication in ApJ Letters

Cited by in corpus (51)

• The UMIST database for astrochemistry 2012
• The Cologne Database for Molecular Spectroscopy, CDMS, in the Virtual Atomic and Molecular Data Centre, VAMDC
• 2021 Census of Interstellar, Circumstellar, Extragalactic, Protoplanetary Disk, and Exoplanetary Molecules
• 2018 Census of Interstellar, Circumstellar, Extragalactic, Protoplanetary Disk, and Exoplanetary Molecules
• Chemistry of Dark Clouds: Databases, Networks, and Models
• Astronomical identification of CN-, the smallest observed molecular anion
• Dust formation in the oxygen-rich AGB star IK Tau
• Discovery of SiCSi in IRC+10216: A missing link between gas and dust carriers of SiC bonds
• A high resolution line survey of IRC+10216 with Herschel. First results: Detection of warm silicon dicarbide SiC2
• Molecular shells in IRC+10216: tracing the mass loss history
• The Effects of Molecular Anions on the Chemistry of Dark Clouds
• Interstellar nitrile anions: Detection of C3N- and C5N- in TMC-1
• Photodetachment as destruction mechanism for CN- and C3N- anions in circumstellar envelopes
• High-Accuracy Quartic Force Field Calculations for the Spectroscopic Constants and Vibrational Frequencies of 1 ^1A' l-C3H-: A Possible Link to Lines Observed in the Horsehead Nebula PDR
• Discovery of the C7N- anion in TMC-1 and IRC+10216
• Carbon-Chain Chemistry in the Interstellar Medium
• Discovery of the elusive thioketenylium, HCCS+, in TMC-1
• The Possible Interstellar Anion CH2CN-: Spectroscopic Constants, Vibrational Frequencies, and Other Considerations
• Astronomical Detection of the Interstellar Anion C10H- towards TMC-1 from the GOTHAM Large Program on the GBT
• Bound and continuum-embedded states of cyanopolyyne anions
• Systematic Theoretical Study on the Interstellar Carbon Chain Molecules
• Photodissociation and chemistry of N${}_2$ in the circumstellar envelope of carbon-rich AGB stars
• Formation of H${}_3^{-}$ by radiative association of H${}_2$ and H${}^{-}$ in the interstellar medium
• Discovery of C5H+ and detection of C3H+ in TMC-1 with the QUIJOTE line survey
• Discovery of the first Ca-bearing molecule in space: CaNC
• Ultra-deep 31.0-50.3 GHz spectral survey of IRC+10216
• A Search for l-C3H+ and l-C3H in Sgr B2(N), Sgr B2(OH), and the Dark Cloud TMC-1
• The abundance and excitation of molecular anions in interstellar clouds
• Evidence for two-electron processes in the mutual neutralization of O- with O+ and N+ at Subthermal Collision Energies
• Interstellar detection of the simplest aminocarbyne, H2NC: an ignored but abundant molecule
• Ultraslow radiative cooling of C${}_n^{-}$ ($n=3-5$)
• Spectroscopic parameters for silacyclopropynylidene, SiC${}_2$, from extensive astronomical observations toward CW Leo (IRC +10216) with the Herschel satellite
• Terahertz-visible two-photon rotational spectroscopy of cold OD-
• An observational investigation of the identity of B11244 ($l$-C${}_3$H${}^{+}$/C${}_3$H${}^{-}$)
• The Sub-millimeter Rotational Spectrum of Ethylene Glycol up to 890 GHz and Application to ALMA Band 10 Spectral Line Data of NGC 6334I
• Vibrational Satellites of C${}_2$S, C${}_3$S, and C${}_4$S: Microwave Spectral Taxonomy as a Stepping Stone to the Millimeter-Wave Band
• Gas-Phase Spectra of MgO Molecules: A Possible Connection from Gas-Phase Molecules to Planet Formation
• A spectral line survey of IRC +10216 between 13.3 and 18.5 GHz
• Electronic and Rovibrational Quantum Chemical Analysis of C${}_3$P${}^{-}$: The Next Interstellar Anion?
• SiS in the circumstellar envelope of IRC +10126: maser and quasi-thermal emission
• Investigating the hot molecular core, G10.47+0.03: A pit of nitrogen-bearing complex organic molecules
• The chemistry of extragalactic carbon stars
• Extensive Quantum Chemistry Study of Neutral and Charged C${}_4$N Chains. An Attempt to Aid Astronomical Observation
• Vibrationally Excited C${}_4$H
• Rotational state-changing collisions of C${}_2$H${}^{-}$ and C${}_2$N${}^{-}$ anions with He under interstellar and cold ion trap conditions: a computational comparison
• Laboratory observation and astronomical search of 1-cyano propargyl radical, HCCCHCN
• Radiative electron attachment to rotating C${}_3$N through dipole-bound states
• A Spectroscopic Survey of Electronic Transitions of C${}_6$H, ${}^{13}$C${}_6$H, and C${}_6$D
• Dianion diagnostics in DESIREE: High-sensitivity detection of ${\text{C}}_n^{2-}$ from a sputter ion source
• Exploring a dynamical path for C${}_2$H${}^{-}$ and NCO${}^{-}$ formation in dark molecular clouds
• Digging into the Massive Protostar S255IR NIRS3: A Study of Nitrogen-Bearing Molecules and Their Prebiotic Chemistry