J/A+A/668/A171ivo://CDS.VizieR/J/A+A/668/A171doi:10.26093/cds/vizier.36680171CDSBiver N.Boissier J.Bockelee-Morvan D.Crovisier J.Cottin H.,Cordiner M.A.Roth N.X.Moreno R.2024-11-28T20:01:19Z2022-12-20T08:33:19ZCDS support team

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

cds-question@unistra.frcometsradio-astronomyradio-spectroscopyWe present the results of millimetre-wave spectroscopic and continuum observations of comet C/2020 F3 (NEOWISE) undertaken with the Institut de RadioAstronomie Millimetrique (IRAM) 30-m and the NOrthern Extended Millimeter Array (NOEMA) telescopes on 22, 25-27 July and 7 August 2020. Production rates of HCN, HNC, CH_3_OH, CS, H_2_CO, CH_3_CN, H_2_S, and CO were determined with upper limits on 6 others species. The comet shows abundances within the range observed in other comets. The CO abundance is low (3.2% relative to water) while H_2_S is relatively abundant (1.1% relative to water). The H_2_CO abundance shows a steep variation with heliocentric distance, possibly related to a distributed production from the dust or macro-molecular source. The CH_3_OH and H_2_S production rates show a slower decrease post-perihelion than water. Interferometric map of the continuum could not detect the nucleus point source contribution (implying a size r<4.7km) but yielded an estimate of the dust production rate, leading to a relatively low dust-to-gas ratio of 0.7+/-0.3 on 22.4 July 2020.2022A&A...668A.171Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/668/A171CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/668/A171https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/668/A171http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/668/A171https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/668/A171https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/668/A171http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/668/A171GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/668/A171/list (List of spectra)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/668/A171/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/668/A171/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/668/A171/list?GETtext/xml+votable180.050000true168.7254840.324610.0055555555555555566/5437 5439 5448 5756 26607 28651https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/668/A171?format=asciiMillimeterRadiodefaultJ/A+A/668/A171/listList of spectrarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right Ascension of center (J2000)degpos.eq.ra;meta.mainDEJ2000Declination of center (J2000)degpos.eq.dec;meta.mainNxNumber of pixels along X-axismeta.numberintObs.dateObservation datestime.epoch;obsnullablebFREQLower value of frequency intervalHzem.freqdoubleBFREQUpper value of frequency intervalHzem.freqdoubledFREQFrequency resolutionHzspect.resolutiondoublesizeSize of FITS fileKibytephys.size;meta.fitsintspShow the spectrummeta.ref.urlcharFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fitschar