J/ApJ/897/L38ivo://CDS.VizieR/J/ApJ/897/L38doi:10.26093/cds/vizier.18979038CDSvan't Hoff M.L.R.Bergin E.A.Jorgensen J.K.Blake G.A.2024-02-15T14:11:32Z2021-10-22T07:23:07ZCDS support team

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

cds-question@unistra.fryoung-stellar-objectsmolecular-physicsEarth's carbon deficit has been a persistent problem in our understanding of the formation of our solar system. A possible solution would be the sublimation of carbon grains at the so-called soot line (~300K) early in the planet-formation process. Here, we argue that the most likely signatures of this process are an excess of hydrocarbons and nitriles inside the soot line, and a higher excitation temperature for these molecules compared to oxygen-bearing complex organics that desorb around the water snowline (~100K). Such characteristics have been reported in the literature, for example, in Orion KL, although not uniformly, potentially due to differences in the observational settings and analysis methods of different studies or the episodic nature of protostellar accretion. If this process is active, this would mean that there is a heretofore unknown component to the carbon chemistry during the protostellar phase that is acting from the top down-starting from the destruction of larger species-instead of from the bottom up from atoms. In the presence of such a top-down component, the origin of organic molecules needs to be re-explored.2020ApJ...897L..38Vhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/897/L38CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+AS/124/205 : W3 star-forming region 345 GHz survey (Helmich+ 1997)J/A+AS/133/29 : Molecular line survey towards UC HII (Hatchell+ 1998)J/ApJS/156/127 : 350{mu}m molecular line survey of Orion KL (Comito+, 2005)J/ApJS/181/321 : Properties of Spitzer c2d dark clouds (Evans+, 2009)J/A+A/539/A143 : Nearby B-stars stellar parameters and abundances (Nieva+,2012)J/A+A/559/A47 : Sgr B2(N) and Sgr B2(M) IRAM 30m line survey (Belloche+, 2013)J/A+A/568/A65 : NGC 7129 FIRS 2 interferometric 1-D spectrum (Fuente+, 2014)J/A+A/581/A71 : Orion-KL substructure at 1.3mm (Feng+, 2015)J/ApJS/232/3 : Spectral line surveys of 30 regions (Widicus Weaver+, 2017)J/A+A/625/A147 : 80-116GHz spectrum of L483 (Agundez+, 2019)J/A+A/632/A57 : G328.2551-0.5321 spectra (Csengeri+, 2019)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/897/L38https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/897/L38http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/897/L38https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/897/L38https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/897/L38http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/897/L38GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/897/L38/table1 (Overview of literature presenting excitation temperatures for both N- and O-COMs in protostars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/897/L38/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/897/L38/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/897/L38/table1?GETtext/xml+votable180.050000true307.353429240.1887750.0055555555555555566/858-859 1054 3198 3649 14315 14622 14655 14689 14704 15857 21439 28830 29091 29096-29097 29101 29103 29510 29535 29653 30218 30256 30259 30269 30318 30405 30644 30692 30694 41676 42170 42457 42970https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/897/L38?format=asciidefaultJ/ApJ/897/L38/table1Overview of literature presenting excitation temperatures for both N- and O-COMs in protostarsSourceSource namemeta.id;meta.maincharTypeSource type; Low, intermediate or high masssrc.morph.typecharTexN[11/753]? Excitation temperature Nitrogen bearing complex organic molecule (1)Kphys.atmol.excitationintnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintE_TexN[0/235]? Positive error in TexN (1)Kstat.error;stat.maxintnullablee_TexN[0/235]? Negative error in TexN (1)Kstat.errorintnullableTexO[4/599]? Excitation temperature Oxygen bearing complex organic molecule (2)Kphys.atmol.excitationintnullableE_TexO[0/412]? Positive error in TexO (2)Kstat.error;stat.maxintnullablee_TexO[0/412]? Negative error in TexO (2)Kstat.errorintnullableTexCH3CN[9/400]? Excitation temperature CH3CN (3)Kphys.atmol.excitationintnullableE_TexCH3CN[0/60]? Positive error in TexCH3CNKstat.error;stat.maxintnullablee_TexCH3CN[0/60]? Negative error in TexCH3CNKstat.errorintnullableTexCH3OH[13/305]? Excitation temperature CH3OH (4)Kphys.atmol.excitationintnullableSimbadNameSimbad column added by the CDSmeta.idcharnullableE_TexCH3OH[0/62]? Positive error in TexCH3OHKstat.error;stat.maxintnullablee_TexCH3OH[0/62]? Negative error in TexCH3OHKstat.errorintnullableCGSSign of carbon-grain sublimation (5)meta.codecharTelTelescope(s) used for observationsinstr.setupcharMethodAnalysis method used; Rotational diagram (RD) or spectral modeling (M)meta.code;obscharRefReference(s) usedmeta.ref;instr.setup_RAPosition from SIMBAD (right ascension part)degpos.eq.ra;meta.mainnullable_DEPosition from SIMBAD (declination part)degpos.eq.dec;meta.mainnullableJ/ApJ/897/L38/refsReferences usedrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRefReference codemeta.notecharAutorMain autorobs.observercharBIBBIBcodemeta.bib.bibcodecharCatCatalog reference in Viziermeta.id;meta.datasetchar