James Webb Telescope reveals asymmetrical atmosphere of exoplanet WASP-17b

Astronomers using NASA’s James Webb Space Telescope have mapped the asymmetrical atmosphere of the exoplanet WASP-17b, located approximately 1,300 light-years from Earth. While exoplanets are traditionally depicted with uniform, circular outlines, this study reveals that the atmosphere of this ‘hot Jupiter’ is distorted, extending further on one side than the other.

The research, published in Nature Astronomy, was a joint effort between Cornell University and the University of Bristol. Scientists utilized an innovative method called ‘transmission strings’ to observe the planet’s structure. The findings indicate that intense heat and powerful winds cause the atmosphere to bulge, specifically on the planet’s evening side, as energy is transported from the permanently lit face to the dark side.

This discovery provides empirical evidence that validates long-standing mathematical models regarding the thermal dynamics of gas giants. The observations also offer detailed insights into the chemical composition and temperature variations across the planet’s equator, poles, and day-night sides.