A reduced chemical scheme for modelling warm to hot hydrogen-dominated atmospheres

Abstract

Three dimensional models that account for chemistry are useful tools to predict the chemical composition of (exo)planet and brown dwarf atmospheres and interpret observations of future telescopes. Recent Juno observations of the NH3 tropospheric distribution in Jupiter also indicate that 3D chemical modelling may be necessary to constrain the deep composition of the giant planets of the Solar System. However, due to the high computational cost of chemistry calculations, 3D chemical modelling has so far been limited. A solution to include chemical kinetics in a 3D model is to use a reduced chemical scheme. In this view, we have developed a reduced scheme containing 30 species and 181 reversible reactions, from the full chemical scheme of Venot et al. 2012. This scheme reproduces accurately the vertical profiles of the observable species (H2O, CH4, CO, CO2, NH3, and HCN) and has a large range of validity. It can be used to study all kind of warm atmospheres, except hot C-rich ones, which contains a high amount of C2H2. It can be used in 1D models, for fast computations, but also in 3D models for hot giant (exo)planet and brown dwarf atmospheres.

arXiv comment13 pages, 11 figures, accepted for publication in A&A

References in corpus (34)

• A KInetic Database for Astrochemistry (KIDA)
• Disequilibrium Carbon, Oxygen, and Nitrogen Chemistry in the Atmospheres of HD 189733b and HD 209458b
• The 0.8-14.5 micron Spectra of Mid-L to Mid-T Dwarfs: Diagnostics of Effective Temperature, Grain Sedimentation, Gas Transport, and Surface Gravity
• Compositional diversity in the atmospheres of hot Neptunes, with application to GJ 436b
• Chemical consequences of the C/O ratio on hot Jupiters: Examples from WASP-12b,CoRoT-2b, XO-1b, and HD 189733b
• Solar System Abundances of the Elements
• Fingering convection and cloudless models for cool brown dwarf atmospheres
• A chemical model for the atmosphere of hot Jupiters
• Dynamics and Disequilibrium Carbon Chemistry in Hot Jupiter Atmospheres, With Application to HD 209458b
• VULCAN: an Open-Source, Validated Chemical Kinetics Python Code for Exoplanetary Atmospheres
• Cloudless atmospheres for L/T dwarfs and extra-solar giant planets
• Water Clouds in Y Dwarfs and Exoplanets
• The Effects of Consistent Chemical Kinetics Calculations on the Pressure-Temperature Profiles and Emission Spectra of Hot Jupiters
• Pseudo 2D chemical model of hot Jupiter atmospheres: application to HD 209458b and HD 189733b
• Condensation-inhibited convection in hydrogen-rich atmospheres: Stability against double-diffusive processes and thermal profiles for Jupiter, Saturn, Uranus, and Neptune
• The Transiting Exoplanet Community Early Release Science Program for JWST
• 3D modeling of GJ1214b's atmosphere: vertical mixing driven by an anti-Hadley circulation
• The impact of atmospheric circulation on the chemistry of the hot Jupiter HD 209458b
• The Deep Water Abundance on Jupiter: New Constraints from Thermochemical Kinetics and Diffusion Modeling
• Scientific rationale for Uranus and Neptune in situ explorations
• New chemical scheme for studying carbon-rich exoplanet atmospheres
• Three-Dimensional Circulation Driving Chemical Disequilibrium in WASP-43b
• Toward the analysis of JWST exoplanet spectra: Identifying troublesome model parameters
• The atmospheric chemistry of the warm Neptune GJ 3470b: influence of metallicity and temperature on the CH4/CO ratio
• First submillimeter observation of CO in the stratosphere of Uranus
• Results from a set of three-dimensional numerical experiments of a hot Jupiter atmosphere
• Observable signatures of wind--driven chemistry with a fully consistent three dimensional radiative hydrodynamics model of HD 209458b
• Record-breaking Storm Activity on Uranus in 2014
• Towards Consistent Modeling of Atmospheric Chemistry and Dynamics in Exoplanets: Validation and Generalization of Chemical Relaxation Method
• The 3D thermal, dynamical and chemical structure of the atmosphere of HD 189733b: implications of wind-driven chemistry for the emission phase curve
• Scientific rationale of Saturn's in situ exploration
• Thermochemistry and vertical mixing in the tropospheres of Uranus and Neptune: How convection inhibition can affect the derivation of deep oxygen abundances
• The Hera Saturn Entry Probe Mission
• A better characterization of the chemical composition of exoplanets atmospheres with ARIEL

Cited by in corpus (28)

• A new set of atmosphere and evolution models for cool T-Y brown dwarfs and giant exoplanets
• A Comparative Study of Atmospheric Chemistry with VULCAN
• Atmospheric Dynamics of Hot Giant Planets and Brown Dwarfs
• Implications of three-dimensional chemical transport in hot Jupiter atmospheres: results from a consistently coupled chemistry-radiation-hydrodynamics model
• A new chemical scheme for giant planet thermochemistry. Update of the methanol chemistry and new reduced chemical scheme
• Awesome SOSS: Atmospheric Characterisation of WASP-96 b using the JWST Early Release Observations
• Observability of signatures of transport-induced chemistry in clear atmospheres of hot gas giant exoplanets
• Grid of Pseudo-2D Chemistry Models for Tidally-Locked Exoplanets. I. The Role of Vertical and Horizontal Mixing
• From cold to hot irradiated gaseous exoplanets: Fingerprints of chemical disequilibrium in atmospheric spectra
• Chemical variation with altitude and longitude on exo-Neptunes: Predictions for Ariel phase-curve observations
• MOVES IV. Modelling the influence of stellar XUV-flux, cosmic rays, and stellar energetic particles on the atmospheric composition of the hot Jupiter HD 189733b
• A Mini-Chemical Scheme with Net Reactions for 3D GCMs II. 3D thermochemical modelling of WASP-39b and HD 189733b
• HCN production in Titan's Atmosphere: Coupling quantum chemistry and disequilibrium atmospheric modeling
• Understanding the atmospheric properties and chemical composition of the ultra-hot Jupiter HAT-P-7b II. Mapping the effects of gas kinetics
• BOWIE-ALIGN: JWST reveals hints of planetesimal accretion and complex sulphur chemistry in the atmosphere of the misaligned hot Jupiter WASP-15b
• 3.8um Imaging of 400-600K Brown Dwarfs and Orbital Constraints for WISEP J045853.90+643452.6AB
• The deep composition of Uranus and Neptune from in situ exploration and thermochemical modeling
• A Mini-Chemical Scheme with Net Reactions for 3D GCMs I.: Thermochemical Kinetics
• Dynamics and Clouds in Planetary Atmospheres from Telescopic Observations
• Dynamically coupled kinetic chemistry in brown dwarf atmospheres I. Performing global scale kinetic modelling
• A physically derived eddy parameterization for giant planet atmospheres with application on hot-Jupiter atmospheres
• The strange case of Na I in the atmosphere of HD209458 b: Reconciling low- and high-resolution spectroscopic observations G
• Cloudy mornings and clear evenings on a gas giant exoplanet
• Three-dimensional Transport-induced Chemistry on Temperate sub-Neptune K2-18b, Part I: the Effects of Atmospheric Dynamics
• DARWEN: Data-driven Algorithm for Reduction of Wide Exoplanetary Networks
• Disentangling Atmospheric Compositions of K2-18 b with Next Generation Facilities
• Hydrocarbon complexity and photochemical shielding of prebiotic feedstock molecules in exoplanet atmospheres
• Three-dimensional transport-induced chemistry on temperate sub-Neptune K2-18b, Part II: the combined effects of atmospheric dynamics and chemical reactions