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WASP-52
Star in the constellation Pegasus From Wikipedia, the free encyclopedia
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WASP-52 is a K-type main-sequence star about 570 light-years away. It is older than the Sun at 10.7+1.9
−4.5 billion years, but it has a similar fraction of heavy elements.[3]
The star has prominent starspot activity, with 3% to 14% of the stellar surface covered by areas 575±150 K cooler than the rest of the photosphere.[6]
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A multiplicity survey in 2015 did not detect any stellar companions.[7] The star was named Anadolu in 2019 by Turkish astronomers as part of the NameExoWorlds contest.[8]
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Planetary system
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In 2012 a transiting hot Jupiter planet, WASP-52b, was detected in a tight, circular orbit.[4] The planet was named Göktürk by Turkish astronomers in December 2019.[8] The planet has a small measured temperature difference between dayside (1481±34 K) and nightside (1224±77 K).[9] Planetary orbit is well aligned with the equatorial plane of the star, the misalignment being 5.47+4.61
−4.21°.[5]
Search for transit timing variation did not result in detection of additional planets in system as in 2021.[10]
A transmission spectrum taken in 2020 has revealed the presence of hydrogen, sodium and potassium,[11] although the sodium and potassium lines may be attributable to volcanically active moons of the gas giant, not the planet itself.[12] The atmosphere has no high winds and relatively low-lying clouds, indicating it is not significantly enriched by heavy elements.[13] No signs of the planetary atmosphere escaping to space were detected in 2020,[14] but updated measurement in 2022 showed signs of helium escape, consistent with mass loss rate of 0.5% per billion years.[15]
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References
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