transitfit 3.0.3

A package to fit exoplanet transit light curves

TransitFit

TransitFit has been developed as part of the ongoing effort of the Spectroscopy and Photometry of Exoplanet Atmospheres Research Network (SPEARNET). SPEARNET is undertaking a survey of exoplanet atmospheres using transmission spectroscopy.

Original Author - Joshua Hayes (Univ. Manchester)

Current maintainer - Akshay Priyadarshi (Univ Manchester)

Overview

TransitFit is designed for exoplanetary transmission spectroscopy studies and offers a flexible approach to fitting single or multiple transits of an exoplanet at different observation wavelengths. It possesses the functionality to efficiently couple host limb-darkening parameters to a range of physical models across different wavelengths, through the use of the Limb darkening toolkit (ldtk) and the Kipping parameterisations of two-parameter limb darkening models. TransitFit uses batman to handle transit light curve modelling, and sampling and retrieval uses the nested sampling algorithm available through dynesty.

Installation

Please note that TransitFit currently only runs on UNIX-based machines.

Along with an installation of Python 3 (with the standard Conda distribution packages), TransitFit requires the following packages to be installed:

• dynesty

• batman

• Limb darkening toolkit (ldtk)

User guide

The documentation for TransitFit can be found here

Citing TransitFit

If you have used TransitFit in your work, please cite the accompanying paper. If you are using BibTeX, you can add the following to your .bib file:

@ARTICLE{2021arXiv210312139H,
        author = {{Hayes}, J.~J.~C. and {Priyadarshi}, A. and {Kerins}, E. and {Awiphan}, S. and {McDonald}, I. and {A-thano}, N. and {Morgan}, J.~S. and {Humpage}, A. and  {Charles-Mindoza}, S. and {Wright}, M. and {Joshi}, Y. and {Jiang}, I.~G. and {Inyanya}, T. and {Padjaroen}, T. and {Munsaket}, P. and {Chuanraksasat}, P. and {Komonjinda}, S. and {Kittara}, P. and {Dhillon}, V.~S. and {Marsh}, T.~R. and {Reichart}, D.~E. and {Poshyachinda}, S.},
        title = "{TransitFit: combined multi-instrument exoplanet transit fitting for JWST, HST and ground-based transmission spectroscopy studies}",
      journal = {arXiv e-prints},
      keywords = {Astrophysics - Earth and Planetary Astrophysics, Astrophysics - Instrumentation and Methods for Astrophysics},
          year = 2023,
        month = feb,
          eid = {arXiv:2103.12139},
        pages = {arXiv:2103.12139},
archivePrefix = {arXiv},
        eprint = {2103.12139},
  primaryClass = {astro-ph.EP},
        adsurl = {https://ui.adsabs.harvard.edu/abs/2021arXiv210312139H},
      adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}