HAT-P-1 System

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Exoplanetary Scratchpad

[SysBP Img]

A stellar binary believed to contain the planet with the biggest known diameter and the least dense. This would have been only the second planet with such a low density. Later measurements showed it wasn't that inflated, and has the expected radius for a highly irradiated core-less Hot Jupiter.

HAT-P-1 System Web Pages

HAT-P-1 System In the News

Puffed Up Planet Discovered (2006)

Planet Not as Bloated As First Thought (Jul 2007)

Planet b Factoids

  • Does not have a core
  • Has a radius of 1.4 Jupiters, but only half the mass
  • Has a quarter of the density of water

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