Titan's photochemical model: Further update, oxygen species, and comparison with Triton and Pluto

► Reduction of the mean difference between the model and observations from a factor of 5 to a factor of 3. ► Detailed oxygen chemistry on Titan using the full selfconsistent model for Titan's atmosphere and ionosphere. ► The model H2O profile is between the CIRS and Herschel H2O observations at 100-250 km and within uncertainties of the ISO and INMS observations. ► Huge diversity between upper atmospheres of Triton and Pluto. ► Meteorite H2O results in precipitation of CO on Triton and CO2 on Pluto.