This is Boss's opinion on XO-3b:
"The XO-3b planet is a puzzle for any theory of planet formation.Most of the short-period hot Jupiters do have nearly circular orbits, so when one has a non-circular orbit, it may simply mean that there is another planet or more in the system that is exciting the orbital eccentricity of the inner one. More data will allow that explanation to be confirmed or rejected."
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