J/AJ/156/68ivo://CDS.VizieR/J/AJ/156/68doi:10.26093/cds/vizier.51560068CDSFaggi S.Villanueva G.L.Mumma M.J.Paganini L.2019-03-11T08:34:27Z2019-02-12T06:52:35ZCDS support team

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

cds-question@unistra.frsolar-systemcometsmolecular-physicsinfrared-astronomyspectroscopyIn 2017 April, we acquired comprehensive high-resolution spectra of newly discovered comet C/2017 E4 (Lovejoy) as it approached perihelion, and before its disintegration. We detected many cometary emission lines in the range (2.8-5.3) {mu}m, in four customized instrument settings (L1-c, L3, Lp1-c, and M1) of iSHELL - the new near-IR high-resolution immersion echelle spectrograph at NASA/IRTF (Maunakea, Hawaii). We identified 12 molecular species: nine primary volatiles (H_2_O, HCN, NH_3_, CO, C_2_H_2_, C_2_H_6_, CH_4_, CH_3_OH, H_2_CO) and three product species (CN, NH_2_, OH). We detected 85 H_2_O emission lines from 12 water vibrational bands across L1-c and M1 settings. The many detected water emission lines enabled retrieval of accurate measures for ortho- and para-H_2_O independently, thereby reducing systematic uncertainty in the derived ortho-para ratio and nuclear spin temperature. Excitation analyses and emission profile analyses were performed for all species, and molecular abundance ratios relative to water are compared with values found for other Oort Cloud comets in our infrared database. Abundance ratios are consistent for most species, with the exception of underabundant methanol and overabundant ammonia in E4.2018AJ....156...68Fhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/156/68CatalogResearchIsServedByTAP VizieR generic servicerelated-toB/comets : Database of the orbital elements of comets (Rocher, 2007)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/156/68https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/156/68http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/156/68https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/156/68https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/156/68http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/156/68GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapInfrareddefaultJ/AJ/156/68/table3Mean flux calibration factorsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSetInstrument setting (G1)instr.setupcharOrder[18/184] Order number per each settingmeta.idintFreq[1933.8252/3534.9645] Mean frequency across the orderscm**-1em.freqdoubleGamma[1.1642e-17/2.7809e-17] Mean {Gamma} calibration factor per order (1)W.m**-2.cm.count**-1.s**-1arith.factordoubleThrough[4.38/10.63] Throughputs of individuals orders%stat.fit.paramfloatJ/AJ/156/68/table4Detected individual emission lines of volatile species in C/2017 E4 (Lovejoy)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMolMolecule namemeta.id;phys.molcharIDMolecular identifiermeta.id;phys.molTrot[75/81] Rotational temperatureKphys.temperatureinte_Trot[3/11]? Uncertainty in TrotKstat.errorintnullableMulti[1e-08/1e-05] g-factor multiplier; e.g. g-fac*Multistat.fit.paramfloatSetiSHELL/IRTF setting (G1)instr.setupcharf_Set[1/12] Flag on Set giving the orders (1)meta.codeintTransTransition quantum numbers; up-lowphys.atmol.qn;phys.atmol.transitionFreq[1949.8073/3539.52]? Mean frequencycm**-1em.freqdoublenullableFlux[0.06/112.59]? Flux of the cometary line at top of the Earth atmosphere1e-19W.m**-2phot.flux;spect.linedoublenullablee_Flux[0.28/8.2182]? Uncertainty in Flux1e-19W.m**-2stat.error;phot.fluxdoublenullableg-fac[0.361/207.5]? Molecular g-factor (fluorescence efficiency)ph.s**-1.mol**-1phys.atmolfloatnullableErot[0/607.61]? Rotational energycm**-1phys.energy;phys.mol.rotationfloatnullableTransm[0.1111/0.9963]? Atmospheric transmittance at the Doppler-shifted position of the cometary linephys.atmoldoublenullable