Kepler Multi-planet Systems Exhibit Unexpected Intra-system Uniformity in Mass and Radius

@article{Millholland2017KeplerMS,
  title={Kepler Multi-planet Systems Exhibit Unexpected Intra-system Uniformity in Mass and Radius},
  author={Sarah C. Millholland and Songhu Wang and Gregory P. Laughlin},
  journal={The Astrophysical Journal Letters},
  year={2017},
  volume={849}
}
The widespread prevalence of close-in, nearly coplanar super-Earth- and sub-Neptune-sized planets in multiple-planet systems was one of the most surprising results from the Kepler mission. By studying a uniform sample of Kepler “multis” with mass measurements from transit-timing variations, we show that a given planetary system tends to harbor a characteristic type of planet. That is, planets in a system have both masses and radii that are far more similar than if the system were assembled… 

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