  Recent laboratory measurements have confirmed that chemical desorption
(desorption of products due to exothermic surface reactions) can be an
efficient process. The impact of including this process into gas-grain chemical
models entirely depends on the formalism used and the associated parameters.
Among these parameters, binding energies are probably the most uncertain ones
for the moment. We propose a new model to compute binding energy of species to
water ice surfaces. We have also compared the model results using either the
new chemical desorption model proposed by Minissale et al. (2016) or the one of
Garrod et al. (2007). The new binding energies have a strong impact on the
formation of complex organic molecules. In addition, the new chemical
desorption model from Minissale produces a much smaller desorption of these
species and also of methanol. Combining the two effects, the abundances of
CH3OH and COMs observed in cold cores cannot be reproduced by astrochemical
models anymore.
