WASP-31b
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WASP-31b is a low-density (puffy) "hot Jupiter" extrasolar planet orbiting the metal-poor dwarf star WASP-31. The exoplanet was discovered in 2010 by the WASP project. WASP-31b is in the constellation of Crater, and is about 1305 light-years from Earth.
"Hot Jupiter" exoplanet WASP-31b (artist concept)
Comparison of "hot Jupiter" exoplanets, including WASP-31b (top row; 3rd from left) (artist concept) From top left to lower right: WASP-12b, WASP-6b, WASP-31b, WASP-39b, HD 189733b, HAT-P-12b, WASP-17b, WASP-19b, HAT-P-1b and HD 209458b.
Hot Jupiter
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Hot Jupiters are a class of gas giant exoplanets that are inferred to be physically similar to Jupiter but that have very short orbital periods. The close proximity to their stars and high surface-atmosphere temperatures resulted in their informal name "hot Jupiters".
An artist's impression of a hot Jupiter orbiting close to its star.
Hot Jupiter with hidden water