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Several chemical networks have been developed to study warm (exo)planetaryatmospheres. The kinetics of the reactions related to the methanol chemistryincluded in these schemes have been questioned. The goal of this paper is toupdate the methanol chemistry for such chemical networks thanks to recentpublications in the combustion literature. We aim also at studying theconsequences of this update on the atmospheric compositions of (exo)planetaryatmospheres and brown dwarfs. We have performed an extensive review ofcombustion experimental studies and revisited the sub-mechanism describingmethanol combustion in the scheme of Venot et al. (2012, A&A 624, A58). Theupdated scheme involves 108 species linked by a total of 1906 reactions. Wehave then applied our 1D kinetic model with this new scheme to several casestudies (HD 209458b, HD 189733b, GJ 436b, GJ 1214b, ULAS J1335+11, Uranus,Neptune), and compared the results obtained with those obtained with the formerscheme. The update of the scheme has a negligible impact on hot Jupitersatmospheres. However, the atmospheric composition of warm Neptunes and browndwarfs is modified sufficiently to impact observational spectra in thewavelength range JWST will operate. Concerning Uranus and Neptune, the updateof the chemical scheme modifies the abundance of CO and thus impacts the deepoxygen abundance required to reproduce the observational data. For future 3Dkinetics models, we also derived a reduced scheme containing 44 species and 582reactions. Chemical schemes should be regularly updated in order to maintain ahigh level of reliability on the results of kinetic models and be able toimprove our knowledge on planetary formation.

A new chemical scheme for giant planet thermochemistry. Update of the methanol chemistry and new reduced chemical scheme