Cold Traps of Hypervolatiles in the Protosolar Nebula at the Origin of the Peculiar Composition of Comet C/2016 R2 (PanSTARRS)
| Autor: | Kathleen Mandt, Olivier Mousis, Alexis Bouquet, Artyom Aguichine, A. Luspay-Kuti, Jonathan I. Lunine, Grégoire Danger |
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| Přispěvatelé: | Laboratoire d'Astrophysique de Marseille (LAM), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS), Physique des interactions ioniques et moléculaires (PIIM), Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS), Cornell University [New York], Aix Marseille Université (AMU), Johns Hopkins University (JHU), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Aix Marseille Université (AMU)-Centre National d'Études Spatiales [Toulouse] (CNES) |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Physics
Nebula Solar System 010504 meteorology & atmospheric sciences Comet [SDU.ASTR.EP]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP] Astronomy and Astrophysics Coma (optics) Astrophysics Key features 01 natural sciences Geophysics 13. Climate action Space and Planetary Science Interstellar comet 0103 physical sciences Earth and Planetary Sciences (miscellaneous) Composition (visual arts) Formation and evolution of the Solar System 010303 astronomy & astrophysics 0105 earth and related environmental sciences |
| Zdroj: | The Planetary Science Journal The Planetary Science Journal, 2021, 2 (2), pp.72. ⟨10.3847/PSJ/abeaa7⟩ The Planetary Science Journal, IOP Science, 2021, 2 (2), pp.72. ⟨10.3847/PSJ/abeaa7⟩ |
| ISSN: | 2632-3338 |
| DOI: | 10.3847/PSJ/abeaa7⟩ |
| Popis: | Recent observations of the long-period comet C/2016 R2 (PanSTARRS; hereafter R2) indicate an unusually high N2/CO abundance ratio, typically larger than ∼0.05, and at least 2–3 times higher than the one measured in 67P/Churyumov–Gerasimenko. Another striking compositional feature of this comet is its heavy depletion in H2O (H2O/CO ∼ 0.32%), compared to other comets. Here we investigate the formation circumstances of a generic comet whose composition reproduces these two key features. We first envisage the possibility that this comet agglomerated from clathrates, but we find that such a scenario does not explain the observed low water abundance. We then alternatively investigate the possibility that the building blocks of R2 agglomerated from grains and pebbles made of pure condensates via the use of a disk model describing the radial transport of volatiles. We show that N2/CO ratios reproducing the value estimated in this comet can be found in grains condensed in the vicinity of the CO and N2 ice lines. Moreover, high CO/H2O ratios (>100 times the initial gas-phase value) can be found in grains condensed in the vicinity of the CO ice line. If the building blocks of a comet assembled from such grains, they should present N2/CO and CO/H2O ratios consistent with the measurements made in R2’s coma. Our scenario indicates that R2 formed in a colder environment than the other comets that share more usual compositions. Our model also explains the unusual composition of the interstellar comet 2l/Borisov. |
| Databáze: | OpenAIRE |
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