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WASP-80
Star in the constellation Aquila From Wikipedia, the free encyclopedia
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WASP-80 is a K-type main-sequence star about 162 light-years away from Earth. The star's age is much younger than the Sun's at 1.352±0.222 billion years.[7] WASP-80 could be similar to the Sun in concentration of heavy elements, although this measurement is highly uncertain.[6]
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The star was named Petra in 2019 by Jordanian amateur astronomers as part of the NameExoWorlds contest.[8]
Three multiplicity surveys in 2015-2018 did not detect any stellar companions to WASP-80, but a survey in 2020 detected a 0.07M☉ companion candidate at an angular separation 2.132±0.010 arcseconds, with a false alarm probability of 3%.[9]
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Planetary system
In 2013 a transiting hot Jupiter planet WASP-80 b was detected on a tight, circular orbit.[10] The planet was named Wadirum by Jordanian astronomers in December 2019.[8] Its equilibrium temperature is 825±19 K, while measured temperature of the dayside is 937±48 K and temperature of the nightside is 851±14 K. This temperature difference indicates a rather low planetary albedo and weak global transport of heat.[11]
Measurement of the Rossiter–McLaughlin effect in 2015 revealed WASP-80b's is orbit is well-aligned with the equatorial plane of the star, with orbital obliquity equal to 14±14°.[4]
Although one transmission spectrum of the planetary atmosphere showed signs of ionised potassium,[12] another measurement in 2017 yielded a gray and featureless spectrum, probably due to a high cloud deck[13] or haze[14] in the atmosphere of WASP-80b. [11]
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References
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