Surface temperature and thermal phase curves for hypothetical exomoons in two longer-period planetary systems. Left column: results for the TOI-2525 b system (planetary orbital period of 23.3 days). Panel a: snapshot of the surface temperature distribution for a tidally locked airless exomoon. Panel b: meridional mean effective emission temperature for an airless exomoon (blue line) and a uniform-temperature exomoon (dashed line). Panel c: thermal phase curves of the exomoons. The dashed line shows the thermal phase curve of a uniformtemperature exomoon with a radius of 6400 km. The exomoons orbit at 40% Hill sphere (285 338 km) around TOI-2525 b, with an orbital period of 3.4 Earth days. Right column: same as the left column but for the CoRoT-9 b system (planetary orbital period 95.3 days). The exomoons orbit at 1 570 880 km around CoRoT-9 b, and the orbital period is 13.9 Earth days.