Description: The tar files below are a collection of spectral models found and described in the paper submitted to the Astrophysical Journal entitled Model atmospheres for massive gas giants with thick clouds: Application to the HR~8799 planets" by N. Madhusudhan, A. Burrows, and T. Currie (2011). We have generated an extensive new suite of massive giant planet atmosphere models and used it to obtain fits to photometric data for the planets HR~8799b, c, and d. We consider a wide range of cloudy and cloud-free models. The cloudy models incorporate different geometrical and optical thicknesses, modal particle sizes, and metallicities. For each planet and set of cloud parameters, we explore grids in gravity and effective temperature, with which we determine constraints on the planet's mass and age. Our new models yield statistically significant fits to the data, and conclusively confirm that the HR 8799 planets have much thicker clouds than those required to explain data for typical L and T dwarfs. Both models with 1) physically thick forsterite clouds and a 60-$\mu m$ modal particle size and 2) clouds made of 1 $\mu m$-sized pure iron droplets and 1\% supersaturation fit the data. The range of best-estimated masses for HR 8799b, HR 8799c, and HR 8799d conservatively span 2--12 M$_{J}$, 7--13 M$_{J}$, and 3--11 M$_{J}$, respectively and imply coeval ages between $\sim$20 and $\sim$150 Myr, consistent with previously reported stellar age. The best-fit temperatures and gravities are slightly lower than values obtained by Currie et al. (2011) using even thicker cloud models. Finally, we use these models to predict the near-to-mid IR colors of soon-to-be imaged planets. Our models predict that planet-mass objects follow a locus in some near-to-mid IR color-magnitude diagrams that is clearly separable from the standard L/T dwarf locus for field brown dwarfs.
Below you will find models used in our HR 8799 study, as well as a suite of new models for "thick" clouds such as those that were necessary to fit the HR8799 "planets," but for a wider range of effective temperatures and gravities:
Nomenclature for cloudy models:
Nomenclature for clear (cloud-free) models:
Hungarian translation courtesy of Szabolcs Csintalan
Slovakian translation, courtesy of Hum2D created by Alexander Minaur
Indonesian translation created by Jordan Silean
Portuguese translation created by Diana Gomes
German translation created by Philipp Egger
Spanish translation by Ryan Holman from Couponobox.com
Punjabi Translation by the Bydiscountcodes Team