astro

Utility functions for common astronomical calculations

alderaan.utils.astro.bin_data(time, data, binsize, bin_centers=None)

Bin a 1D timeseries data array

If bin_centers is not provided, bins will be linearly spaced between (time.min(),time.max())

Parameters:

• time (ndarray) – time values

• data (ndarray) – corresponding data to be binned

• binsize (float) – bin size for output data, in same units as time

• bin_centers (optional) – pre-defined bin centers

Returns:

a tuple containing:

• time_binned (array-like)

• data_binned (array-like)

Return type:

tuple

alderaan.utils.astro.estimate_transit_depth(p, b)

Calculate approximate transit depth following Mandel & Agol (2002)

Parameters:

• p (array-like) – planet-to-star radius ratio Rp/Rstar

• b (array-like) – impact parameter

Returns:

transit depth

Return type:

array-like

alderaan.utils.astro.predict_tc_error(ror, b, T14, texp, sigma_f)

Predict uncertainty on mid-transit time See Carter+2008

Parameters:

• ror (planet-to-star radius ratio)

• b (impact parameter)

• T14 (first-to-fourth contact transit duration)

• texp (exposure time (in same units as T14))

• sigma_f (photometric error on flux)