ajplanet

This repository contains a number of C codes that are useful for exoplanet work. In particular, here you will find codes to:

- Model transit lightcurves.
- Model radial velocities. 

It also contains a Pyhton directory that interfaces the C functions so that they can be called from Python (see below).

Compiling the C code

To compile the C code edit the Makefile and do:

'make'

Calling the module from Python

To call the module from Python, go to the Python folder in this module and do:

`python setup.py build`

This will generate a build folder. Inside the folder, another folder will be created which starts with lib., inside of which you will find the ajplanet.so file which is callable from Python. You can then issue:

`python setup.py install`

or manually move that file to a folder with your code and import it directly by doing import ajplanet, and use the functions inside the module.

You can compile and install ajplanet automatically by copying the following lines.

git clone https://github.com/andres-jordan/ajplanet.git
cd ajplanet
make
cd Python
python setup.py build
python setup.py install
cd ../../

Modelling Radial Velocities with ajplanet

The modelling of Radial Velocities is very simple. Just call the code from Python by doing:

ajplanet.pl_rv_array(times,gamma,K,omega,ecc,t0,P)

Where times is an array of times, gamma is the center-of-mass velocity, K is the semi-amplitude, omega is the argument of periapsis (in radians), ecc is the eccentricity of the orbit, t0 is the time of transit center and P is the period of the orbit. This will return radial velocities at the input times with the same units as K.