Understanding exoplanets: Unraveling the mysteries of planets that are hotter than stars

Kelt-9 b might've formed away from its parent star and had a violent past with collisions happening as it migrated inwards.

from http://www.firstpost.com/tech/science/understanding-exoplanets-unraveling-the-mysteries-of-planets-that-are-hotter-than-stars-9423841.html