A secondary atmosphere on the rocky Exoplanet 55 Cancri e. (https://pubmed.ncbi.nlm.nih.gov/38718834/)

These scientists were studying a planet called 55 Cnc e, which is similar in size to Earth but much hotter. They used special instruments on a telescope called JWST to look at the planet and figure out what its atmosphere is made of. They found that the planet doesn't have a thin atmosphere like they thought it might, but instead has a real atmosphere made of gases like carbon dioxide or carbon monoxide. They think these gases are coming from a hot liquid rock ocean on the planet's surface.

Hu R., Bello-Arufe A., Zhang M., Paragas K., Zilinskas M., van Buchem C., Bess M., Patel J., Ito Y., Damiano M., Scheucher M., Oza AV., Knutson HA., Miguel Y., Dragomir D., Brandeker A., Demory BO. A secondary atmosphere on the rocky Exoplanet 55 Cancri e. Nature. 2024 May 8. doi: 10.1038/s41586-024-07432-x.