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The Sonora Substellar Atmosphere Models. IV. Elf Owl: Atmospheric Mixing and Chemical Disequilibrium with Varying Metallicity and C/O Ratios by Mukherjee, Sagnick; Fortney, Jonathan J.; Morley, Caroline V.; Batalha, Natasha E.; Marley, Mark S.; Karalidi, Theodora; Visscher, Channon; Lupu, Roxana; Freedman, Richard; Gharib-Nezhad, Ehsan is a scholarly article available to read on EtoBox.

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

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 $K_{\rm zz}$ 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 $K_{\rm zz}$ across several orders of magnitude and also encompasses sub-solar to super-solar metallicities and C/O ratios. We find that the impact of $K_{\rm zz}$ on the $T(P)$ profile and spectra is a strong function of both $T_{\rm eff}$ and metallicity. For metal-poor objects $K_{\rm zz}$ has large impacts on the atmosphere at significantly higher $T_{\rm eff}$ compared to metal-rich atmospheres where the impact of $K_{\rm zz}$ is seen to occur at lower $T_{\rm eff}$. We identify significant spectral degeneracies between va

Author

Mukherjee, Sagnick; Fortney, Jonathan J.; Morley, Caroline V.; Batalha, Natasha E.; Marley, Mark S.; Karalidi, Theodora; Visscher, Channon; Lupu, Roxana; Freedman, Richard; Gharib-Nezhad, Ehsan

Published

2024

Language

EN