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Chemistry in Protoplanetary Disks: A Sensitivity Analysis

hal.structure.identifierMax-Planck-Institut für Astronomie [MPIA]
dc.contributor.authorVASYUNIN, A. I.
hal.structure.identifierMax-Planck-Institut für Astronomie [MPIA]
dc.contributor.authorSEMENOV, D.
hal.structure.identifierMax-Planck-Institut für Astronomie [MPIA]
dc.contributor.authorHENNING, Th.
hal.structure.identifierLaboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
hal.structure.identifierObservatoire aquitain des sciences de l'univers [OASU]
hal.structure.identifierLaboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux [L3AB]
dc.contributor.authorWAKELAM, Valentine
hal.structure.identifierThe Ohio State University [Columbus] [OSU]
dc.contributor.authorHERBST, Eric
hal.structure.identifierUral State University
dc.contributor.authorSOBOLEV, A. M.
dc.date.issued2008
dc.identifier.issn0004-637X
dc.description.abstractEnWe study how uncertainties in the rate coefficients of chemical reactions in the RATE 06 database affect abundances and column densities of key molecules in protoplanetary disks. We randomly varied the gas-phase reaction rates within their uncertainty limits and calculated the time-dependent abundances and column densities using a gas-grain chemical model and a flaring steady state disk model. We find that key species can be separated into two distinct groups according to the sensitivity of their column densities to the rate uncertainties. The first group includes CO, C+, H+3, H2O, NH3, N2H+, and HCNH+. For these species the column densities are not very sensitive to the rate uncertainties, but the abundances in specific regions are. The second group includes CS, CO2, HCO+, H2CO, C2H, CN, HCN, HNC, and other, more complex species, for which high abundances and abundance uncertainties coexist in the same disk region, leading to larger scatters in column densities. However, even for complex and heavy molecules, the dispersion in their column densities is not more than a factor of ~4. We perform a sensitivity analysis of the computed abundances to rate uncertainties and identify those reactions with the most problematic rate coefficients. We conclude that the rate coefficients of about a hundred chemical reactions need to be determined more accurately in order to greatly improve the reliability of modern astrochemical models. This improvement should be an ultimate goal of future laboratory studies and theoretical investigations.
dc.language.isoen
dc.publisherAmerican Astronomical Society
dc.subject.enAccretion
dc.subject.enAccretion Disks
dc.subject.enAstrochemistry
dc.subject.enMethods: Statistical
dc.subject.enMolecular Processes
dc.subject.enStars: Planetary Systems: Protoplanetary Disks
dc.title.enChemistry in Protoplanetary Disks: A Sensitivity Analysis
dc.typeArticle de revue
dc.identifier.doi10.1086/523887
dc.subject.halPhysique [physics]/Astrophysique [astro-ph]/Cosmologie et astrophysique extra-galactique [astro-ph.CO]
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]
dc.identifier.arxiv0709.3323
bordeaux.journalThe Astrophysical Journal
bordeaux.page629-641
bordeaux.volume672
bordeaux.peerReviewedoui
hal.identifierhal-00260218
hal.version1
hal.popularnon
hal.audienceNon spécifiée
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00260218v1
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