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Peas in a Pod? Radius correlations in Kepler multi-planet systems
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We address the claim of Weiss et al. (2018) that the radii of adjacent planets in Kepler multi-planet systems are correlated. We explore two simple toy models---in the first the radii of the planets are chosen at random from a single universal distribution, and in the second we postulate several types of system with distinct radius distributions. We show that an apparent correlation between the radii of adjacent planets similar to the one reported by Weiss et al. (2018) can arise in both models. In addition the second model fits the radius and signal-to-noise distribution of the observed planets. We also comment on the validity of a commonly used correction that is used to estimate intrinsic planet occurrence rates, based on weighting planets by the inverse of their detectability.
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Enhanced Stability in Planetary Systems with Similar Masses
Non-equal-mass planet systems are less dynamically stable than equal-mass systems at the same Hill-radius spacing, especially away from first-order resonances, which may help explain the observed peas-in-a-pod mass un...
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