J/A+A/703/A282ivo://CDS.VizieR/J/A+A/703/A282CDSRiviere-Marichalar P.le Gal R.Fuente A.Semenov D.Esplugues G.,Navarro-Almaida D.Facchin S.2026-03-02T06:25:50Z2025-11-24T09:37:40ZCDS support team

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

cds-question@unistra.frvariable-starsinterferometryinterstellar-mediumspectroscopyProtoplanetary disks inherit their chemical composition from their natal molecular cloud, although the extent to which this material is preserved versus reset through chemical reprocessing remains an open question. Understanding this balance is a major topic in astrochemistry and star and planet formation. Comparing the chemical composition of the envelope and the protoplanetary disk is key to solving the topic. However, disentangling protoplanetary disk emission from envelope emission is not an easy task. The goal of this is paper to investigate chemical differences between the disk and the surrounding envelope by comparing the column density ratios of a few selected species in each region. The selected source is HL Tau, where molecular absorption lines from the envelope have been detected, thus allowing for the derivation of column densities and molecular abundances. We present new NOEMA observations of HL Tau, targeting the following species: CS, H_2_CO, H_2_S, and SO_2_. We produce zeroth-, first-, and second-moment maps for the species where emission was detected and use them to analyse the spatial distribution and kinematic properties of the different molecules in the disk and the envelope. We derive column densities and compare the values derived for the envelope and disk. We also compute the rotational diagram for the SO_2_ detected transitions. Assuming two different temperature regimes, 17 and 58K, we derive column densities for the species surveyed in the disk and compare them with values derived for the envelope. We find large differences in the derived column density ratios of the molecules surveyed, especially for N(CS)/N(H_2_S), which is 40 to 50 times larger in the envelope. We attribute these variations to the different excitation and UV-irradiation regimes in the disk and envelope. We also note strong gradients in the ratios between different positions of the disk and tentatively attribute them to different levels of turbulence at different azimuths. The observed differences in molecular ratios in the envelope and the disk are suggestive of chemical reprocessing of the gas during the formation and evolution of the protoplanetary disk.2025A&A...703A.282Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/703/A282CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/644/A120 : HL TAU and IRAS04302+2247 H2CS ALMA images (Codella+, 2020)J/A+A/658/A104 : HL Tau SO2 14(0-14)-13(1,13) datacube (Garufi+, 2022)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/703/A282https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/703/A282http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/703/A282https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/703/A282https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/703/A282http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/703/A282GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/703/A282/list (List of fits datacubes and map)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/703/A282/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/703/A282/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/703/A282/list?GETtext/xml+votable180.050000true67.9108118.23250.0055555555555555566/23549https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/703/A282?format=asciidefaultJ/A+A/703/A282/listList of fits datacubes and maprecnoRecord 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.numberintNyNumber of pixels along Y-axismeta.numberintNz? Number of pixels along Z-axis for data cubesmeta.numberintnullablebVRAD? Lower value of VRAD intervalm/sphys.veloc;pos.heliocentricfloatnullableBVRAD? Upper value of VRAD intervalm/sphys.veloc;pos.heliocentricfloatnullabledVRAD? VRAD resolutionm/sspect.resolutionfloatnullablesizeSize of FITS fileKibytephys.size;meta.fitsintFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fitschar