Sulfur chemistry in the atmospheres of warm and hot Jupiters
| Autor: | Paul B. Rimmer, Richard Hobbs, Oliver Shorttle, Nikku Madhusudhan |
|---|---|
| Přispěvatelé: | Shorttle, Oliver [0000-0002-8713-1446], Nikku, Madhusudhan [0000-0002-4869-000X], Apollo - University of Cambridge Repository |
| Rok vydání: | 2021 |
| Předmět: |
010504 meteorology & atmospheric sciences
chemistry.chemical_element Thermodynamics FOS: Physical sciences planets and satellites: individual: HD 209458 b 01 natural sciences Reaction rate Atmosphere Jupiter Physics - Chemical Physics 0103 physical sciences Hot Jupiter Mixing ratio planets and satellites: individual: 51 Eri b 010303 astronomy & astrophysics 0105 earth and related environmental sciences Physics Earth and Planetary Astrophysics (astro-ph.EP) Chemical Physics (physics.chem-ph) planets and satellites: atmospheres planets and satellites: composition Astronomy and Astrophysics Sulfur planets and satellites: gaseous planets chemistry Space and Planetary Science Production (computer science) Bar (unit) Astrophysics - Earth and Planetary Astrophysics |
| DOI: | 10.17863/cam.71970 |
| Popis: | We present and validate a new network of atmospheric thermo-chemical and photo-chemical sulfur reactions. We use a 1-D chemical kinetics model to investigate these reactions as part of a broader HCNO chemical network in a series of hot and warm Jupiters. We find that temperatures approaching $1400\,\mathrm{K}$ are favourable for the production of H2S and HS around $\mathrm{10^{-3}\,bar}$, the atmospheric level where detection by transit spectroscopy may be possible, leading to mixing ratios of around $10^{-6}$. At lower temperatures, down to $1000\,\mathrm{K}$, the abundance of S2 can be up to a mixing ratio of $10^{-5}$ at the same pressure, at the expense of H2S and HS, which are depleted down to a mixing ratio of $10^{-6}$. We also investigate how the inclusion of sulfur can manifest in an atmosphere indirectly, by its effect on the abundance of non-sulfur-bearing species. We find that in a model of the atmosphere of HD 209458 b, the inclusion of sulfur can lower the abundance of NH3, CH4 and HCN by up to two orders of magnitude around $\mathrm{10^{-3}\,bar}$. In the atmosphere of the warm Jupiter 51 Eri b, we additionally find the inclusion of sulphur depletes the peak abundance of CO2 by a factor of five, qualitatively consistent with prior models. We note that many of the reactions used in the network have poorly determined rates, especially at higher temperatures. To obtain a truly accurate idea of the impact of sulfur chemistry in hot and warm Jupiter atmospheres, new measurements of these reaction rates must take place. Comment: 17 pages, 9 Figures |
| Databáze: | OpenAIRE |
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