Title: Classifying Exoplanets with Gaussian Mixture Model,
Abstract: Recently, Odrzywolek and Rafelski (arXiv:1612.03556) have found three
distinct categories of exoplanets, when they are classified based on density.
We first carry out a similar classification of exoplanets according to their
density using the Gaussian Mixture Model, followed by information theoretic
criterion (AIC and BIC) to determine the optimum number of components. Such a
one-dimensional classification favors two components using AIC and three using
BIC, but the statistical significance from both the tests is not significant
enough to decisively pick the best model between two and three components. We
then extend this GMM-based classification to two dimensions by using both the
density and the Earth similarity index (arXiv:1702.03678), which is a measure
of how similar each planet is compared to the Earth. For this two-dimensional
classification, both AIC and BIC provide decisive evidence in favor of three
components.