A robust method for inferring line-of-sight velocities from Doppler shifted spectra

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  • License: MIT License (MIT)
  • Author: Richard Teague & Daniel Foreman-Mackey
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# 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. This has been shown om [Vakili & Hogg (2016)](https://arxiv.org/abs/1610.05873) 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.

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Avatar for danfm from gravatar.com danfm Avatar for richteague from gravatar.com richteague

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  • License: MIT License (MIT)
  • Author: Richard Teague & Daniel Foreman-Mackey
Classifiers

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