author={Isamu Matsuyama and Doug Johnstone and Norman W. Murray},
  journal={The Astrophysical Journal},
The recent discovery of Jupiter mass planets orbiting at a few AU from their stars complements earlier detections of massive planets on very small orbits. The short-period orbits strongly suggest that planet migration has occurred, with the likely mechanism being tidal interactions between the planets and the gas disks out of which they formed. The newly discovered long-period planets, together with the gas giant planets in our solar system, show that migration is either absent or rapidly… 

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