# Model atmospheres of sub-stellar mass objects

## TL;DR

This paper reviews the theoretical framework and numerical methods used to model the atmospheres of sub-stellar objects like brown dwarfs and exoplanets, focusing on the CoolTlusty code.

## Contribution

It provides a comprehensive outline of the assumptions, equations, and numerical techniques specific to modeling sub-stellar atmospheres, including a critical evaluation of existing codes.

## Key findings

- Analysis of the physical assumptions underlying sub-stellar atmospheres
- Evaluation of numerical methods for solving atmospheric structure equations
- Assessment of the efficiency and accuracy of different modeling codes

## Abstract

We present an outline of basic assumptions and governing structural equations describing atmospheres of substellar mass objects, in particular the extrasolar giant planets and brown dwarfs. Although most of the presentation of the physical and numerical background is generic, details of the implementation pertain mostly to the code CoolTlusty. We also present a review of numerical approaches and computer codes devised to solve the structural equations, and make a critical evaluation of their efficiency and accuracy.