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This artist’s concept shows what the hot gas-giant exoplanet WASP-43 b could look like. WASP-43 b is a Jupiter-sized planet circling a star roughly 280 light-years away, in the constellation Sextans. The planet orbits at a distance of about 1.3 million miles , completing one circuit in about 19.5 hours. Because it is so close to its star, WASP-43 b is probably tidally locked: its rotation rate and orbital period are the same, such that one side faces the star at all times.
Scientists used the James Webb Telescope to study WASP-43b, finding high-altitude clouds and large temperature differences between its day and night sides. Their findings provide insights into the planet’s extreme climate and atmospheric dynamics.) and observed the entire orbit of WASP-43b, a giant, gas-filled exoplanet. These “phase curve” observations, conducted during Webb’s inaugural year, revealed the temperature distribution across the entire planet and shed light on the planetary climate.
The team found that WASP-43b’s permanently illuminated dayside is as hot as 2285°F , while the planet’s nightside, although permanently shadowed, was still very hot 1115°F .“The absence of direct sunlight on the planet’s nightside causes significant temperature differences between the day and night sides, which prompts the formation of exceptionally strong winds,” said Dobbs-Dixon, an expert in 3-dimensional atmospheric models and heat redistribution of exoplanetary atmospheres.
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