Astronomers have detected supersonic winds on WASP-127b. This marks the first time ever that a jetstream of this kind has ever been measured on an exoplanet outside of our solar ever, with winds reaching speeds of up to 20,505 mph (33,000 km/h).
The team mapped the weather and make-up of WASP-127b using the CRIRES+ instrument on ESO’s VLT, as they managed to trace its composition by measuring how the light of the host star travels through the planet’s upper atmosphere. What they discovered was the presence of water vapor as well as carbon monoxide molecules in the planet’s atmosphere, but in a double peak, indicating that one side of the atmosphere is moving towards us and the other away at high speed. Very powerful jetstream winds around the equator of WASP-127b would explain this unexpected result.
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Part of the atmosphere of this planet is moving towards us at a high velocity while another part is moving away from us at the same speed. This signal shows us that there is a very fast, supersonic, jet wind around the planet’s equator,” said Lisa Nortmann, a scientist at the University of Göttingen, Germany, and lead author of the study.
