Horizontal transport as a source of disequilibrium chemistry on the nightside of a hot exoplanet
Megan Weiner Mansfield
Nature Astronomy, Published online: 30 April 2026; doi:10.1038/s41550-026-02845-2 JWST observations of both the dayside and nightside of a hot exoplanet show that horizontal winds transport chemical species faster than the time they need to react chemically, which drives the nightside atmosphere out of chemical equilibrium.