TAU: A 1D radiative transfer code for transmission spectroscopy of extrasolar planet atmospheres

TL;DR

TAU is a publicly available 1D radiative transfer code designed for modeling transmission spectra of exoplanet atmospheres, incorporating pressure-temperature profiles and molecular absorption data.

Contribution

It introduces a flexible, parallelized C++ code for simulating transmission spectra of close-in exoplanets, enhancing modeling capabilities with detailed absorption calculations.

Findings

Efficient computation of transmission spectra using line-by-line radiative transfer.

Applicable to a wide range of exoplanet atmospheric conditions.

Open-source availability facilitates community use and development.

Abstract

The TAU code is a 1D line-by-line radiative transfer code, which is generally applicable for modelling transmission spectra of close-in extrasolar planets. The inputs are the assumed pressure-temperature profile of the planetary atmosphere, the continuum absorption coefficients and the absorption cross-sections for the trace molecular absorbers present in the model, as well as the fundamental system parameters taken from the published literature. The program then calculates the optical path through the planetary atmosphere of the radiation from the host star, and quantifies the absorption due to the modelled composition in a transmission spectrum of transit depth as a function of wavelength. The code is written in C++, parallelised using OpenMP, and is available for public download and use from http://www.ucl.ac.uk/exoplanets/.