A robust method for inferring line-of-sight velocities from Doppler shifted spectra
Project description
bettermoments
Measuring precise line-of-sight velocities is essential when looking for small scale deviations indicative of, for example, embedded planets. bettermoments helps you measure such velocities.
Approach
Rather than fitting the full line profile with an analytical expression, we fit a quadratic to the the peak pixel and its two adjacent pixels. For a single component, this has been shown om Vakili & Hogg (2016) to provide comparable precision to fitting the full spectrum with the true underlying profile. Thus, in the extremely likely scenario where the underlying profile is not known, this method will out perform more common methods, such as the intensity weighted average.
Usage
To start, install the bettermoments package by executing
pip install bettermoments
Then you can execute this module using
import bettermoments as bm
x_max, x_max_sigma, y_max, y_max_sigma = pm.quadratic(data, uncertainties)
See the docstring for the bettermoments.quadratic function for more
information on the available options.
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