# Time Series & Transits

## Barycentric Time Correction (MJD to BJD Conversion)

* Light Travel Time Delay

## Transit Modeling

* Basic Model
  * [Code: PyTransit](https://pytransit.readthedocs.io/en/latest/)
  * [Code: starry](https://starry.readthedocs.io/en/latest/?badge=latest)
* Parameterization
  * Transforms
  * Quadratic Limb Darkening: u1, u2 → q1, q2 (Kipping+2016)
  * Impact Parameter and Rp/Rs (Espinoza+2018)
  * Stellar Density

## Period Search, Periodogram

* [Box Least Squares](https://docs.astropy.org/en/stable/timeseries/bls.html)
* [Transit Least Squares](https://github.com/hippke/tls)
* [Lomb-Scargle Periodogram](https://docs.astropy.org/en/stable/api/astropy.timeseries.LombScargle.html)
* [Generalized Lomb-Scargle](https://github.com/mzechmeister/GLS)