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Home Science & Environment

Astronomers uncover the topsy-turvy atmosphere of a distant planet todayheadline

February 18, 2025
in Science & Environment
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The three layers of the atmosphere of the gas giant Tylos

ESO/M. Kornmesser

The atmosphere of a distant world has been mapped in detail for the first time, revealing a strange, topsy-turvy weather system, with the fastest winds ever seen inexplicably blowing around the planet’s stratosphere.

Astronomers have studied WASP-121b, also known as Tylos, since 2015. The planet, which is 900 light years away, is a vast ball of gas double the size of Jupiter, and it orbits its star extremely closely, completing a full orbit in just 30 Earth hours. This close orbit heats the planet’s atmosphere to temperatures of 2500°C, hot enough to boil iron.

Now, Julia Seidel at the European Southern Observatory in Chile and her colleagues have looked inside Tylos’s scorchingly hot atmosphere using the observatory’s Very Large Telescope, and they found it has at least three distinct layers of gas moving in different directions around the planet – a structure unlike anything astronomers have ever seen. “It’s absolutely crazy, science fiction-y patterns and behaviours,” says Seidel.

The planetary atmospheres in our solar system share a broadly similar structure to one another, where a jet stream of powerful winds blowing in the lower portion of the atmosphere is driven by internal temperature differences, while winds in the upper layers are more affected by temperature differences created by the sun’s heat, which warms the daylight side of the planet but not the other.

Yet in Tylos’s atmosphere, it is the winds in the lower layer that are driven by heat from the planet’s star, travelling away from the warm side, while the jet stream appears to be mostly in the middle layer of the atmosphere, travelling around Tylos’s equator in the direction of the planet’s rotation. An upper layer of hydrogen also shows jetstream-like features, flowing around the planet but also drifting outwards into space. This is difficult to explain using our current models, says Seidel. “What we see now is actually exactly the inverse of what comes out of theory.”

What’s more, the jet stream on Tylos is the most powerful ever seen, blasting at around 70,000 kilometres per hour across half the planet – double the speed of the previous record holder. Exactly what is driving this speed is unclear, but the researchers think that it may be due to the planet’s strong magnetic field or because of ultraviolet radiation from its star. “This could possibly change the flow patterns, but this is all highly speculative,” says Seidel.

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Tags: atmosphereExoplanets
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