J/ApJ/806/L3ivo://CDS.VizieR/J/ApJ/806/L3doi:10.26093/cds/vizier.18069003CDSCernicharo J.McCarthy M.C.Gottlieb C.A.Agundez M.Velilla Prieto L.,Baraban J.H.Changala P.B.Guelin M.Kahane C.Martin-Drumel M.A.,Patel N.A.Reilly N.J.Stanton J.F.Quintana-Lacaci G.Thorwirth S.,Young K.H.2017-01-23T22:00:00Z2015-11-19T12:50:17ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frcarbon-starsatomic-physicsWe report the discovery in space of a disilicon species, SiCSi, from observations between 80 and 350GHz with the IRAM 30m 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 SiC_2_. As expected from chemical equilibrium calculations, SiCSi and SiC_2_ 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.2015ApJ...806L...3Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/806/L3CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+A/574/A56 : IRC +10216 17.8GHz-26.3GHz spectrum (Gong+, 2015)J/A+A/545/A12 : Chemistry of IRC+10216 inner wind modelled (Cherchneff, 2012)J/ApJS/193/17 : Spectral-line survey of IRC+10216 at 293-355GHz (Patel+, 2011)J/ApJS/190/348 : 1mm spectral survey of IRC+10216 + VY CMa (Tenenbaum+, 2010)J/ApJS/186/406 : 350um polarimetry from CSO (Dotson+, 2010)J/ApJS/182/143 : SCUPOL Legacy polarimetry of SCUBA (Matthews+, 2009)J/ApJS/177/275 : 1.3 and 2mm survey of IRC+10216 (He+, 2008)J/ApJ/688/L83 : Detection of C_5_N^-^ in IRC +10216 (Cernicharo+, 2008)J/A+A/431/773 : CHARM2, an updated of CHARM catalog (Richichi+, 2005)J/ApJS/154/673 : COBE DIRBE Point Source Catalog (Smith+, 2004)J/A+AS/142/181 : 2mm molecular line survey of IRC+10 216 (Cernicharo+, 2000)J/A+A/330/676 : IRC+10216 Silicon and sulfur chemistry (Willacy+ 1998)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/806/L3https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/806/L3http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/806/L3https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/806/L3https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/806/L3http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/806/L3GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/ApJ/806/L3/table2Observed lines of SiCSi in the laboratory and in IRC+10216Ka1[0/5] Upper K_a_ levelphys.mol.qnintKc1[1/47] Upper K_c_ levelphys.mol.qnintJ0[0/47] Lower J levelmeta.noteintKa0[0/4] Lower K_a_ levelphys.mol.qnintKc0[0/46] Lower K_c_ levelphys.mol.qnintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintJ1[1/48] Upper J levelmeta.noteintnuObs[6718.9/350483] Observed frequencyMHzem.freqdoublee_nuObs[0.002/2] The 1{sigma} uncertainty in nuObsMHzstat.errorfloatintTA*[0.05/0.93]? Integrated antenna temperatureK.km/sphot.antennaTempfloatnullablee_intTA*[0.006/0.1]? The 1{sigma} uncertainty in intTA*K.km/sstat.errorfloatnullablenuPre[6718.9/350484.1] Predicted frequencyMHzem.freqdoublee_nuPre[0.001/1] The 1{sigma} uncertainty in nuPreMHzstat.errorfloatEup[3.3/484.5] Upper level energyKphys.energy;phys.atmol.levelfloatSul[0.5/33.6] Line strengthspect.line.intensityfloatsigma[0.6/16.7]? The 1{sigma} observation noisemKinstr.det.noise;obsfloatnullablef_sigma[l] l: laboratory datameta.codechar