Published October 19, 2021 | Version v1
Dataset Open

Sonora Cholla: A Grid of Cloud-free, Solar Metallicity Models in Chemical Disequilibrium for the JWST Era

  • 1. University of Central Florida
  • 2. NASA Ames
  • 3. University of California Santa Cruz
  • 4. University of Texas at Austin
  • 5. Los Alamos National Laboratory
  • 6. BAER Institute, NASA Ames Research Center
  • 7. Dordt University
  • 8. SETI Institute, NASA Ames Research Center


Exoplanet and brown dwarf atmospheres commonly show signs of disequilibrium chemistry. In the James Webb Space Telescope era high resolution spectra of directly  imaged exoplanets will allow the characterization of their atmospheres in more detail, and allow systematic tests for the  presence of chemical species that deviate from thermochemical equilibrium in these atmospheres. Constraining  the presence of disequilibrium chemistry in these atmospheres as a function of parameters  such as their effective temperature and surface gravity will allow us to  place better constrains in the physics governing these atmospheres.

This database contains a grid of cloud-free, solar metallicity  atmospheres for brown dwarfs and wide separation giant planets with key molecular species such as CH4, H2O, CO and NH3  in disequilibrium. The grid covers atmospheres with Teff~[500 K,1300 K], logg~[3.0,5.5] (cgs) and an eddy diffusion parameter  of log Kzz=2, 4 and 7 (cgs). A description of the code and a study of the effect of different parameters within the grid on the temperature and composition profiles of our atmospheres is presented in the accompanying paper "The Sonora Substellar Atmosphere Models. II. Cholla: A Grid of Cloud-free, Solar  Metallicity Models in Chemical Disequilibrium for the JWST Era" (accepted to ApJ, Oct. 2021)


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