A resonant chain of four transiting, sub-Neptune planets

@article{Mills2016ARC,
  title={A resonant chain of four transiting, sub-Neptune planets},
  author={Sean M. Mills and Daniel C. Fabrycky and Cezary Migaszewski and Eric B. Ford and Erik A. Petigura and Howard T. Isaacson},
  journal={Nature},
  year={2016},
  volume={533},
  pages={509-512}
}
Surveys have revealed many multi-planet systems containing super-Earths and Neptunes in orbits of a few days to a few months. There is debate whether in situ assembly or inward migration is the dominant mechanism of the formation of such planetary systems. Simulations suggest that migration creates tightly packed systems with planets whose orbital periods may be expressed as ratios of small integers (resonances), often in a many-planet series (chain). In the hundreds of multi-planet systems of… 
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