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WASP-31b
Hot Jupiter orbiting the star WASP-31 From Wikipedia, the free encyclopedia
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WASP-31b is a low-density (puffy) "hot Jupiter" extrasolar planet orbiting the metal-poor (63% of solar metallicity) dwarf star WASP-31.[1] The exoplanet was discovered in 2010 by the WASP project.[2][1] WASP-31b is in the constellation of Crater,[3] and is about 1305 light-years[4] (light travel distance) from Earth.[2]
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WASP-31b is a low-density (puffy) "hot Jupiter" exoplanet with a mass about 0.48 times that of Jupiter and a radius about 1.55 times that of Jupiter.[2][1] The planetary atmosphere has indeed the largest scale height, equal to 1150km, among exoplanets with measurable atmospheres as at 2021.[5]
The exoplanet orbits WASP-31, its host star, every 3.4 days.[2]
Comparison of "hot Jupiter" exoplanets, including WASP-31b
(top row; 3rd from left) (artist concept)
(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.
In 2012, it was found from the Rossiter–McLaughlin effect that WASP-31b is orbiting the parent star in a prograde direction, with the WASP-31 star rotational axis inclined to the planetary orbit by 2.8±3.1 degrees.[6] The spectroscopic study in 2014 revealed that WASP-31b has a dense cloud deck overlaid by a hazy atmosphere.[7] WASP-31b was also reported to have significant amounts of potassium in its upper atmosphere, but the detection of potassium was refuted in 2015.[8] The potassium detection discrepancy was resolved in 2020 with the improved cloud deck model,[9] with the best fit being a very small amount of water over clouds and no potassium at all.[10]
Reanalysis of planetary spectroscopic data in 2020 has revealed the presence of chromium monohydride besides water.[11]
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