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https://github.com/hpparvi/PyTransit

Fast and easy exoplanet transit light curve modelling.
https://github.com/hpparvi/PyTransit

astronomy astrophysics exoplanet exoplanets light-curve-models python transit-model transiting-exoplanets

Last synced: 7 days ago
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Fast and easy exoplanet transit light curve modelling.

Host: GitHub
URL: https://github.com/hpparvi/PyTransit
Owner: hpparvi
License: gpl-2.0
Created: 2012-11-24T11:08:39.000Z (almost 12 years ago)
Default Branch: master
Last Pushed: 2024-05-01T20:22:32.000Z (6 months ago)
Last Synced: 2024-05-22T04:31:38.129Z (6 months ago)
Topics: astronomy, astrophysics, exoplanet, exoplanets, light-curve-models, python, transit-model, transiting-exoplanets
Language: Jupyter Notebook
Homepage:
Size: 36.4 MB
Stars: 95
Watchers: 5
Forks: 23
Open Issues: 5
Metadata Files:
- Readme: README.md
- Changelog: CHANGELOG.md
- License: LICENSE

Awesome Lists containing this project

README

        PyTransit

=========

[![Licence](http://img.shields.io/badge/license-GPLv2-blue.svg?style=flat)](http://www.gnu.org/licenses/gpl-2.0.html)

[![MNRAS](https://img.shields.io/badge/MNRAS-10.1093%2Fmnras%2Fstv894-blue.svg)](http://mnras.oxfordjournals.org/content/450/3/3233)

[![arXiv](http://img.shields.io/badge/arXiv-1504.07433-blue.svg?style=flat)](http://arxiv.org/abs/1504.07433)

[![ASCL](https://img.shields.io/badge/ASCL-A1505.024-blue.svg?style=flat)](http://ascl.net/1505.024)

[![DOI](https://zenodo.org/badge/5871/hpparvi/PyTransit.svg)](https://zenodo.org/badge/latestdoi/5871/hpparvi/PyTransit)

*PyTransit: fast and versatile exoplanet transit light curve modelling in Python.* PyTransit provides a set of optimised

transit models with a unified API that makes modelling complex sets of heterogeneous light curve (nearly) as easy as 

modelling individual transit light curves. The models are optimised with Numba which allows for model evaluation speeds

paralleling Fortran and C-implementations but with hassle-free platform-independent multithreading.

The package has been under continuous development since 2009, and is described in [Parviainen (2015)](http://arxiv.org/abs/1504.07433), 

[Parviainen (2020a)](https://ui.adsabs.harvard.edu/abs/2020MNRAS.499.1633P/abstract), and [Parviainen & Korth (2020b)](https://ui.adsabs.harvard.edu/abs/2020MNRAS.499.3356P/abstract). 

```Python

from pytransit import RoadRunnerModel

tm = RoadRunnerModel('quadratic')

tm.set_data(times)

tm.evaluate(k=0.1, ldc=[0.2, 0.1], t0=0.0, p=1.0, a=3.0, i=0.5*pi)

tm.evaluate(k=[0.10, 0.12], ldc=[[0.2, 0.1], [0.5, 0.1]], t0=0.0, p=1.0, a=3.0, i=0.5*pi)

tm.evaluate(k=[[0.10, 0.12], [0.11, 0.13]], ldc=[[0.2, 0.1], [0.5, 0.1],[0.4, 0.2, 0.75, 0.1]],

            t0=[0.0, 0.01], p=[1, 1], a=[3.0, 2.9], i=[.5*pi, .5*pi])

```

![](doc/source/basic_example_1.svg)

![](doc/source/basic_example_2.svg)

![](doc/source/basic_example_3.svg)

  

## Examples and tutorials

### EMAC Workshop introduction video

[![EMAC Workshop PyTransit introduction video](video1.png)](https://youtu.be/bLnxkFNrMDQ?si=OTjr4kUGK1kkhkLC)

### RoadRunner transit model

RoadRunner [(Parviainen, 2020a)](https://ui.adsabs.harvard.edu/abs/2020MNRAS.499.1633P/abstract) is a fast exoplanet transit model that can use any radially symmetric function to model stellar limb darkening 

while still being faster to evaluate than the analytical transit model for quadratic limb darkening.

- [RRModel example 1](https://github.com/hpparvi/PyTransit/blob/dev/doc/source/notebooks/models/roadrunner/roadrunner_model_example_1.ipynb) 

  shows how to use RoadRunner with the included limb darkening models.

- [RRModel example 2](https://github.com/hpparvi/PyTransit/blob/dev/doc/source/notebooks/models/roadrunner/roadrunner_model_example_2.ipynb)

  shows how to use RoadRunner with your own limb darkening model.

- [RRModel example 3](https://github.com/hpparvi/PyTransit/blob/dev/doc/source/notebooks/models/roadrunner/roadrunner_model_example_3.ipynb) 

  shows how to use an LDTk-based limb darkening model LDTkM with RoadRunner.

### Transmission spectroscopy transit model

Transmission spectroscopy transit model (TSModel) is a special version of the RoadRunner model dedicated to modelling 

transmission spectrum light curves. 

 

 - [TSModel Example 1](https://github.com/hpparvi/PyTransit/blob/dev/notebooks/roadrunner/tsmodel_example_1.ipynb)

## Documentation

Read the docs at [pytransit.readthedocs.io](https://pytransit.readthedocs.io).

Installation

------------

### PyPI

The easiest way to install PyTransit is by using `pip`

    pip install pytransit

### GitHub

Clone the repository from github and do the normal python package installation

    git clone https://github.com/hpparvi/PyTransit.git

    cd PyTransit

    pip install .

Citing

------

If you use PyTransit in your reserach, please cite

Parviainen, H. MNRAS 450, 3233–3238 (2015) (DOI:10.1093/mnras/stv894).

or use this ready-made BibTeX entry

    @article{Parviainen2015,

      author = {Parviainen, Hannu},

      doi = {10.1093/mnras/stv894},

      journal = {MNRAS},

      number = {April},

      pages = {3233--3238},

      title = {{PYTRANSIT: fast and easy exoplanet transit modelling in PYTHON}},

      url = {http://mnras.oxfordjournals.org/cgi/doi/10.1093/mnras/stv894},

      volume = {450},

      year = {2015}

    }

Author

------

  - [Hannu Parviainen](mailto:[email protected]), Instituto de Astrofísica de Canarias