chromatic_fitting

The chromatic_fitting package is a friendly, open-source python package that is built on the chromatic tool. chromatic transforms spectroscopic light curves into Rainbow 🌈 objects which allows for easy visualization and comparison.

This package uses pymc3 and exoplanet to perform transit fits (as well as fits for other models) to spectroscopic light curve data. It can combine transit models with polynomial models (in time, x, y etc.) or Gaussian Process models to account for the systematics in the light curves and to fit all parameters simultaeously. There is also the option to perform fits for a 'white light curve', fit wavelengths independently or to fit all wavelengths simultaneously. This tool will also produce a transmission spectrum from the chosen fits.

The goal of chromatic_fitting is to aid the fast, easy comparison of different data reduction techniques by standardizing the light curve-fitting stage. Its flexibility also allows the comparison of different types of fits and models to understand the impact on the corresponding transmission spectra.