Gentle or Jumping? The Varied Lives of "Hot Jupiters": Scientific American:
"Ever since Swiss astronomers astonished the world by finding a gas-giant planet orbiting close to its star, researchers have wondered how these so-called hot Jupiters arose. None exists in our solar system, where the planetary giants—Jupiter, Saturn, Uranus and Neptune—reside in the deep freeze beyond the asteroid belt. Now a surprising discovery is providing fresh insight, suggesting that the more iron a star was born with, the more likely it is that the star's hot Jupiter had a violent past."
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