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Exoplanetary Scratchpad

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A hot F6 star that has an Inflated Very Hot Super Jupiter that is only 2.5 stellar radii from its host star. It may perish soon once it reaches its star's roche limit, but astronomers are puzzled why it hasn't already. Because it orbits much faster than its star rotates, tidal effects should be causing it to fall inwards. Further observations should reveal its rate of decay. Has the shortest period of any Hot Jupiter at the time of its discovery in 2009 (22hours). Extremely hot because of its close distance and brightness of its star, reaches 3000K. A very large planet with 70% more radius than Jupiter and 40% more mass. Very near to the Roche limit, it is expected to be elongated (football shaped). Initially thought to be slightly eccentric, this is not the case.

WASP-18 System Web Pages[]

WASP-18 System In the News[]

Planet in Imminent Danger (Aug 2009)[]

Exoclimes Article (Dec 2011)[]

See Also[]