The Sonora Substellar Atmosphere Models. IV. Elf Owl: Atmospheric Mixing and Chemical Disequilibrium with Varying Metallicity and C/O Ratios

Abstract

Disequilibrium chemistry due to vertical mixing in the atmospheres of many brown dwarfs and giant exoplanets is well-established. Atmosphere models for these objects typically parameterize mixing with the highly uncertain $K_{\mathrm{zz}}$ diffusion parameter. The role of mixing in altering the abundances of C-N-O-bearing molecules has mostly been explored for solar composition atmospheres. However, atmospheric metallicity and the C/O ratio also impact atmospheric chemistry. Therefore, we present the \texttt{Sonora Elf Owl} grid of self-consistent cloud-free 1D radiative-convective equilibrium model atmospheres for JWST observations, which includes a variation of $K_{\mathrm{zz}}$ across several orders of magnitude and also encompasses sub-solar to super-solar metallicities and C/O ratios. We find that the impact of $K_{\mathrm{zz}}$ on the $T(P)$ profile and spectra is a strong function of both $T_{\mathrm{eff}}$ and metallicity. For metal-poor objects $K_{\mathrm{zz}}$ has large impacts on the atmosphere at significantly higher $T_{\mathrm{eff}}$ compared to metal-rich atmospheres where the impact of $K_{\mathrm{zz}}$ is seen to occur at lower $T_{\mathrm{eff}}$. We identify significant spectral degeneracies between varying $K_{\mathrm{zz}}$ and metallicity in multiple wavelength windows, in particular at 3-5 $\mu$m. We use the \texttt{Sonora Elf Owl} atmospheric grid to fit the observed spectra of a sample of 9 early to late T- type objects from $T_{\mathrm{eff}}=550-1150$ K. We find evidence for very inefficient vertical mixing in these objects with inferred $K_{\mathrm{zz}}$ values lying in the range between $\sim$ 10${}^1$-10${}^4$ cm${}^2$s${}^{-1}$. Using self-consistent models, we find that this slow vertical mixing is due to the observations probing mixing in the deep detached radiative zone in these atmospheres.

arXiv commentAccepted for Publication in The Astrophysical Journal, 16 Figures, 3 Tables, 28 Pages

References in corpus (104)

• The NumPy array: a structure for efficient numerical computation
• dynesty: A Dynamic Nested Sampling Package for Estimating Bayesian Posteriors and Evidences
• Planetary Radii across Five Orders of Magnitude in Mass and Stellar Insolation: Application to Transits
• Models of Stars, Brown Dwarfs and Exoplanets
• Precipitating Condensation Clouds in Substellar Atmospheres
• A Unified Theory for the Atmospheres of the Hot and Very Hot Jupiters: Two Classes of Irradiated Atmospheres
• The Evolution of L and T Dwarfs in Color-Magnitude Diagrams
• ExoMol molecular line lists XXX: a complete high-accuracy line list for water
• The Hawaii Infrared Parallax Program. I. Ultracool Binaries and the L/T Transition
• Abundances of the elements in the solar system
• Line and Mean Opacities for Ultracool Dwarfs and Extrasolar Planets
• Disequilibrium Carbon, Oxygen, and Nitrogen Chemistry in the Atmospheres of HD 189733b and HD 209458b
• C/O ratio as a Dimension for Characterizing Exoplanetary Atmospheres
• Neglected Clouds in T and Y Dwarf Atmospheres
• ExoMol line lists IV: The rotation-vibration spectrum of methane up to 1500 K
• L and T Dwarf Models and the L to T Transition
• Gaseous Mean Opacities for Giant Planet and Ultracool Dwarf Atmospheres over a Range of Metallicities and Temperatures
• 3D mixing in hot Jupiter atmospheres. I. application to the day/night cold trap in HD 209458b
• A variationally computed line list for hot NH3
• Clouds and Chemistry: Ultracool Dwarf Atmospheric Properties from Optical and Infrared Colors
• Atmospheric, Evolutionary, and Spectral Models of the Brown Dwarf Gliese 229 B
• ExoMol line lists III: An improved hot rotation-vibration line list for HCN and HNC
• Early Release Science of the exoplanet WASP-39b with JWST NIRSpec PRISM
• A new set of atmosphere and evolution models for cool T-Y brown dwarfs and giant exoplanets
• Chemical consequences of the C/O ratio on hot Jupiters: Examples from WASP-12b,CoRoT-2b, XO-1b, and HD 189733b
• Atmospheric Chemistry in Giant Planets, Brown Dwarfs, and Low-Mass Dwarf Stars II. Sulfur and Phosphorus
• Comparative Planetary Atmospheres: Models of TrES-1 and HD209458b
• ExoMol Molecular linelists -- XXXIII. The spectrum of Titanium Oxide
• Early Release Science of the Exoplanet WASP-39b with JWST NIRSpec G395H
• Fingering convection and cloudless models for cool brown dwarf atmospheres
• The Hawaii Infrared Parallax Program. II. Young Ultracool Field Dwarfs
• Improved HCN/HNC linelist, model atmospheres and synthetic spectra for WZ Cas
• ExoMol molecular line lists - XVI: The rotation-vibration spectrum of hot H${}_2$S
• Aerosol Composition of Hot Giant Exoplanets Dominated by Silicates and Hydrocarbon Hazes
• Early Release Science of the exoplanet WASP-39b with JWST NIRISS
• Distances, Luminosities, and Temperatures of the Coldest Known Substellar Objects
• ExoMol line lists XVIII. The high temperature spectrum of VO
• Methane, Carbon Monoxide, and Ammonia in Brown Dwarfs and Self-Luminous Giant Planets
• VULCAN: an Open-Source, Validated Chemical Kinetics Python Code for Exoplanetary Atmospheres
• A Patchy Cloud Model for the L to T Dwarf Transition
• Ammonia as a tracer of chemical equilibrium in the T7.5 dwarf Gliese 570D
• Line Intensities and Molecular Opacities of the FeH $F^4{\Delta }_i-X^4{\Delta }_i$ Transition
• Early Release Science of the exoplanet WASP-39b with JWST NIRCam
• Simultaneous Detection of Water, Methane and Carbon Monoxide in the Atmosphere of Exoplanet HR8799b
• Water Clouds in Y Dwarfs and Exoplanets
• Exoplanet Reflected Light Spectroscopy with PICASO
• Quenching of Carbon Monoxide and Methane in the Atmospheres of Cool Brown Dwarfs and Hot Jupiters
• ExoMol line lists VII: The rotation-vibration spectrum of phosphine up to 1500 K
• A self-consistent cloud model for brown dwarfs and young giant exoplanets: comparison with photometric and spectroscopic observations
• The JWST Early Release Science Program for Direct Observations of Exoplanetary Systems II: A 1 to 20 Micron Spectrum of the Planetary-Mass Companion VHS 1256-1257 b
• The Effects of Consistent Chemical Kinetics Calculations on the Pressure-Temperature Profiles and Emission Spectra of Hot Jupiters
• Dynamic mineral clouds on HD 189733b I. 3D RHD with kinetic, non-equilibrium cloud formation
• Irradiated Planets
• The Spectrum of the Brown Dwarf Gliese 229B
• ExoMol line lists II: The ro-vibrational spectrum of SiO
• New study of the line profiles of sodium perturbed by H2
• ExoMol molecular line lists V: The ro-vibrational spectra of NaCl and KCl
• New CrH Opacities for the Study of L and Brown Dwarf Atmospheres
• New H2 collision-induced absorption and NH3 opacity and the spectra of the coolest brown dwarfs
• The Young Planet-mass Object 2M1207b: a cool, cloudy, and methane-poor atmosphere
• K-H_2 Quasi-molecular absorption detected in the T-dwarf epsilon Indi Ba
• The role of convection, overshoot, and gravity waves for the transport of dust in M dwarf and brown dwarf atmospheres
• Treatment of overlapping gaseous absorption with the correlated-k method in hot Jupiter and brown dwarf atmosphere models
• Photometry and Proper Motions of M, L, and T Dwarfs from the Pan-STARRS1 3$\pi$ Survey
• PICASO 3.0: A One-Dimensional Climate Model for Giant Planets and Brown Dwarfs
• Beyond Equilibrium Temperature: How the Atmosphere/Interior Connection Affects the Onset of Methane, Ammonia, and Clouds in Warm Transiting Giant Planets
• Uniform Atmospheric Retrieval Analysis of Ultracool Dwarfs II: Properties of 11 T-dwarfs
• Vibrational transition moments of CH${}_4$ from first principles
• The Deep Water Abundance on Jupiter: New Constraints from Thermochemical Kinetics and Diffusion Modeling
• A Volume-Limited Sample of Ultracool Dwarfs. I. Construction, Space Density, and a Gap in the L/T Transition
• Global-mean Vertical Tracer Mixing in Planetary Atmospheres I: Theory and Fast-rotating Planets
• Observations of Disequilibrium CO Chemistry in the Coldest Brown Dwarfs
• Vertical Tracer Mixing in Hot Jupiter Atmospheres
• Microphysics of KCl and ZnS Clouds on GJ 1214b
• Chemical Constraints on the Water and Total Oxygen Abundances in the Deep Atmosphere of Saturn
• Ultracool Dwarfs Observed with the Spitzer Infrared Spectrograph. II. Emergence and Sedimentation of Silicate Clouds in L Dwarfs, and Analysis of the Full M5--T9 Field Dwarf Spectroscopic Sample
• AKARI Observations of Brown Dwarfs. III. CO, CO2 and CH4 Fundamental Bands and Physical Parameters
• A Uniform Retrieval Analysis of Ultracool Dwarfs. III. Properties of Y-Dwarfs
• Radiative cooling functions for primordial molecules
• Spectroscopic Detection of Carbon Monoxide in Two Late-type T Dwarfs
• EXOPLINES: Molecular Absorption Cross-Section Database for Brown Dwarf and Giant Exoplanet Atmospheres
• The Sonora Substellar Atmosphere Models. II. Cholla: A Grid of Cloud-free, Solar Metallicity Models in Chemical Disequilibrium for the JWST Era
• Probing the Extent of Vertical Mixing in Brown Dwarf Atmospheres with Disequilibrium Chemistry
• ExoMol molecular line lists XX: a comprehensive line list for H${}_3^{+}$
• Self-consistent Models of Y Dwarf Atmospheres with Water Clouds and Disequilibrium Chemistry
• The First JWST Spectral Energy Distribution of a Y dwarf
• Assessing the C/O Ratio Formation Diagnostic: A Potential Trend with Companion Mass
• Modeling the disequilibrium species for Jupiter and Saturn: Implications for Juno and Saturn entry probe
• A New Algorithm for 2-D Transport for Astrophysical Simulations: I. General Formulation and Tests for the 1-D Spherical Case
• Empirically Determining Substellar Cloud Compositions in the era of JWST
• Chemical variation with altitude and longitude on exo-Neptunes: Predictions for Ariel phase-curve observations
• Exploring the Extremes: Characterizing a New Population of Old and Cold Brown Dwarfs
• Uniform Forward-Modeling Analysis of Ultracool Dwarfs. II. Atmospheric Properties of 55 Late-T Dwarfs
• Dust in brown dwarfs and extra-solar planets. VII. Cloud formation in diffusive atmospheres
• Nitrogen as a Tracer of Giant Planet Formation. I.: A Universal Deep Adiabatic Profile and Semi-analytical Predictions of Disequilibrium Ammonia Abundances in Warm Exoplanetary Atmospheres
• An Atmospheric Retrieval of the Brown Dwarf Gliese 229B
• Chemical Mixing Induced by Internal Gravity Waves in Intermediate Mass Stars
• Jet Streams and Tracer Mixing in the Atmospheres of Brown Dwarfs and Isolated Young Giant Planets
• First Observations of the Brown Dwarf HD 19467 B with JWST
• Microphysics of Water Clouds in the Atmospheres of Y Dwarfs and Temperate Giant Planets
• Dynamically coupled kinetic chemistry in brown dwarf atmospheres I. Performing global scale kinetic modelling
• Following the Lithium: Tracing Li-bearing Molecules Across Age, Mass, and Gravity in Brown Dwarfs
• Large Uncertainties in the Thermodynamics of Phosphorus (III) Oxide (P${}_4$O${}_6$) Have Significant Implications for Phosphorus Species in Planetary Atmospheres
• The infrared colors of 51 Eridani b: micrometereoid dust or chemical disequilibrium?

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• The Sonora Substellar Atmosphere Models VI. Red Diamondback: Extending Diamondback with SPHINX for Brown Dwarf Early Evolution
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• Atmospheric abundances and bulk properties of the binary brown dwarf Gliese 229 Bab from JWST/MIRI spectroscopy
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• Reflected-light Phase Curves with PICASO: A Kepler-7b Case Study
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• Direct Imaging Discovery of Giant Exoplanet $\beta$ Pictoris d: A Decade-Long Game of Hide-and-Seek
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• Cloudy solutions for the clear skies of WASP-80b: 3D cloud feedback on the atmosphere and spectra of a warm Jupiter
• Simulations of Electron Beam Interactions in Brown Dwarf Atmospheres
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• JWST high-contrast spectroscopy with speckle modelling: Atmospheric retrievals of the T dwarf companion HD 19467 B
• Next-generation Exo-REM atmospheric models: application to VHS 1256 b to emulate patchy clouds
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• JWST-TST High Contrast: First Direct Spectroscopy of GJ 504 b reveals Clouds and Possible Metal Enrichment