Gas-phase sequestration of noble gases in the protosolar nebula: possible consequences on the outer solar system composition
| Autor: | Pauzat, F., Ellinger, Y., Mousis, O., Ali Dib, M., Ozgurel, O., Zicler, E. |
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| Přispěvatelé: | Laboratoire de chimie théorique (LCT), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Univers, Transport, Interfaces, Nanostructures, Atmosphère et environnement, Molécules (UMR 6213) (UTINAM), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Franche-Comté (UFC), Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC), Université de Franche-Comté (UFC), Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: |
Physics
Nebula Solar System Planetesimal Astrochemistry 010504 meteorology & atmospheric sciences [PHYS.ASTR.EP]Physics [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP] Krypton chemistry.chemical_element Astronomy and Astrophysics Astrophysics 01 natural sciences Astrobiology Xenon chemistry 13. Climate action Space and Planetary Science Planet 0103 physical sciences Protoplanet 010303 astronomy & astrophysics ComputingMilieux_MISCELLANEOUS 0105 earth and related environmental sciences |
| Zdroj: | The Astrophysical Journal The Astrophysical Journal, 2013, 777 (1), pp.29. ⟨10.1088/0004-637X/777/1/29⟩ The Astrophysical Journal, American Astronomical Society, 2013, 777 (1), pp.29. ⟨10.1088/0004-637X/777/1/29⟩ |
| ISSN: | 0004-637X 1538-4357 |
| Popis: | We address the problem of the sequestration of Ar, Kr, and Xe by H in the gas-phase conditions encountered during the cooling of protoplanetary disks when H is competing with other species present in the same environment. Using high-level ab initio simulations, we try to quantify other sequestration possibilities involving He, H, H2O, and H3O+ present in the protosolar nebula. Apart from the fact that H complexes formed with heavy noble gases are found to be by far much more stable than those formed with He or H2O, we show that H2D+ and H3O+, both products of the reactions of H with HD and H2O, can also be efficient trapping agents for Ar, Kr, and Xe. Meanwhile, the abundance profile of H in the outer part of the nebula is revisited with the use of an evolutionary accretion disk model that allows us to investigate the possibility that heavy noble gases can be sequestered by H at earlier epochs than those corresponding to their trapping in planetesimals. We find that H might be abundant enough in the outer protosolar nebula to trap Xe and Kr prior their condensation epochs, implying that their abundances should be solar in Saturn's current atmosphere and below the observational limit in Titan. The same scenario predicts that comets formed at high heliocentric distances should also be depleted in Kr and Xe. In situ measurements, such as those planed with the Rosetta mission on 67P/Churyumov-Gerasimenko, will be critical to check the validity of our hypotheses. |
| Databáze: | OpenAIRE |
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