Grid of pseudo-2D chemistry models for tidally locked exoplanets - II. The role of photochemistry
| Autor: | Leen Decin, Thomas Konings, Olivia Venot, Robin Baeyens, Ludmila Carone |
|---|---|
| Přispěvatelé: | The Royal Society, University of St Andrews. School of Physics and Astronomy, Catholic University of Leuven - Katholieke Universiteit Leuven (KU Leuven), Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA (UMR_7583)), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), Max-Planck-Institut für Astronomie (MPIA), Max-Planck-Gesellschaft, University of St Andrews [Scotland] |
| Jazyk: | angličtina |
| Rok vydání: | 2022 |
| Předmět: |
[SDU.ASTR.EP]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP]
NDAS FOS: Physical sciences Astronomy & Astrophysics NEAR-UV QB Astronomy TRANSMISSION SPECTRUM composition [planets and satellites] QC QB Earth and Planetary Astrophysics (astro-ph.EP) planets and satellites: atmospheres Science & Technology EXOMOL LINE LISTS planets and satellites: composition DISEQUILIBRIUM CARBON Astronomy and Astrophysics atmospheres [planets and satellites] HYDROCARBON CHEMISTRY planets and satellites: gaseous planets QC Physics GIANT PLANETS Space and Planetary Science Physical Sciences HD 189733B X-RAY ATMOSPHERES [CHIM.OTHE]Chemical Sciences/Other EMISSION Astrophysics - Earth and Planetary Astrophysics |
| Zdroj: | Monthly Notices of the Royal Astronomical Society Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P-Oxford Open Option A, 2022, 512 (4), pp.4877-4892. ⟨10.1093/mnras/stac809⟩ |
| ISSN: | 0035-8711 1365-2966 |
| DOI: | 10.1093/mnras/stac809⟩ |
| Popis: | Photochemistry is expected to change the chemical composition of the upper atmospheres of irradiated exoplanets through the dissociation of species, such as methane and ammonia, and the association of others, such as hydrogen cyanide. Although primarily the high altitude day side should be affected by photochemistry, it is still unclear how dynamical processes transport photochemical species throughout the atmosphere, and how these chemical disequilibrium effects scale with different parameters. In this work we investigate the influence of photochemistry in a two-dimensional context, by synthesizing a grid of photochemical models across a large range of temperatures. We find that photochemistry can strongly change the atmospheric composition, even up to depths of several bar in cool exoplanets. We further identify a sweet spot for the photochemical production of hydrogen cyanide and acetylene, two important haze precursors, between effective temperatures of 800 and 1400 K. The night sides of most cool planets (effective temperature < 1800 K) are shown to host photochemistry products, transported from the day side by horizontal advection. Synthetic transmission spectra are only marginally affected by photochemistry, but we suggest that observational studies probing higher altitudes, such as high-resolution spectroscopy, take photochemistry into account. 16 pages, 9 figures, accepted for publication in MNRAS |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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