Final v2.0.0

Final legacy version.

target

Generates the priors and host star variables for a chosen target.
Downloads exoplanet archives every 10 days and stores in /data.
Target light curve files must be contained within a folder by the name of its target.

An example use with TransitFit is the following:
    
Host Info
    exoplanet, curves, dtype = 'WASP-43 b', 1, 'eu'
    
    host_T, host_z, host_r, host_logg  = target(exoplanet, curves)
    
Paths to data, priors, and filter info:
    data = 'data/data_paths.csv'
    
    priors = 'data/priors.csv'

Parameters
----------
exoplanet : string, example: 'WASP-43 b'
    The target exoplanet.
    
curves : int, optional
    How many light curves to fit. Updates data paths for chosen target.
    Must be contained within the target folder, 
    ie 'WASP-43 b/split_curve_0.csv'.
    The default is 1.
    
dtype : string, optional
    Allows for inputs 'nasa' or 'eu'. The default is 'eu'.
    
    EU : Data downloaded and stored in 'data/eu_data.csv'.
    http://exoplanet.eu/catalog/#
    
    NASA : Data downloaded and stored in 'data/nasa_data.csv'.
    https://exoplanetarchive.ipac.caltech.edu/index.html

Returns
-------
host_T : tuple or None
    The effective temperature of the host star, in Kelvin. 
host_z : tuple or None
    The log_10 of the surface gravity of the host star, 
    with gravity measured in cm/s2. 
host_r : tuple or None
    The metalicity of the host, given as a (value, uncertainty) pair.
host_logg : tuple or None
    The host radius in Solar radii.
data/data_paths.csv : file
    The locations of the light curves to fit.
data/priors.csv : file
    The priors for the chosen target.
data/eu.csv : file
    EU : Data downloaded and stored in 'data/eu_data.csv'.
    http://exoplanet.eu/catalog/#
data/nasa.csv : file
    NASA : Data downloaded and stored in 'data/nasa_data.csv'.
    https://exoplanetarchive.ipac.caltech.edu/index.html