LiGrad

Transit Model for Gravity-Darkened Oblate Stars

Developed by Eleftherios Voulimiotis

This package can be used for generating transit light-curves for gravity-darkened, oblate stars using a simple vectorized approach.

It features:

• Gravity-darkening calculation
• Limb-darkening (quadratic law)
• Vectorized method for planet occultation integration
• Example scripts and a manual included

LiGrad makes use of the following packages:

• Numpy, Oliphant 2006
• SciPy, Virtanen et al. 2020
• Pylightcurve, Tsiaras et al. 2016
• Astropy, Astropy Collaboration 2013
• Emcee, Foreman-Mackey et al. 2013
• Matplotlib, Hunter 2007
• Exoclock, Kokori et al. 2020
• Astroquery, Ginsburg et al. 2019

as well as the following catalogues:

• Exoplanet Characterisation Catalogue, developed as part of the ExoClock Project, Kokori et al. 2020
• MAST Catalogs, (MAST 2021, MAST Portal Guide, eds. R.A. Shaw, B. Cherinka, P. Forshay)
• Exo.MAST, DR Rodriguez et al. 2020
• ESA Gaia Archive, Gaia Collaboration et al. 2023

Installation

You can install LiGrad through pip:

pip install ligrad

git clone https://github.com/evoulimiotis/ligrad.git
cd ligrad
python setup.py install

See MANUAL.pdf in for detailed information.