An international team of astronomers has assembled and reprocessed observations of the exoplanet WASP-121 b that were collected with the NASA/ESA Hubble Space Telescope in the years 2016, 2018 and 2019. This provided them with a unique dataset that allowed them not only to analyse the atmosphere of WASP-121 b, but also to compare the state of the exoplanet’s atmosphere across several years.
The team found clear evidence that the observations of WASP-121 b were varying in time. Using sophisticated modelling techniques, they demonstrated that these temporal variations could be explained by weather patterns in the exoplanet’s atmosphere.
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