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Simulated exoplanet transmission spectra are critical for planning andinterpretation of observations and to explore the sensitivity of spectralfeatures to atmospheric thermochemical processes. We present a publiclyavailable generic model grid of planetary transmission spectra, scalable to awide range of H$_2$/He dominated atmospheres. The grid is computed using the1D/2D atmosphere model ATMO for two different chemical scenarios, firstconsidering local condensation only, secondly considering global condensationand removal of species from the atmospheric column (rainout). The entire gridconsists of 56,320 model simulations across 22 equilibrium temperatures (400 -2600 K), four planetary gravities (5 - 50 ms$^{-2}$), five atmosphericmetallicities (1x - 200x), four C/O ratios (0.35 - 1.0), four scattering hazeparameters, four uniform cloud parameters, and two chemical scenarios. Wederive scaling equations which can be used with this grid, for a wide range ofplanet-star combinations. We validate this grid by comparing it with othermodel transmission spectra available in the literature. We highlight some ofthe important findings, such as the rise of SO$_2$ features at 100x solarmetallicity, differences in spectral features at high C/O ratios between twocondensation approaches, the importance of VO features without TiO to constrainthe limb temperature and features of TiO/VO both, to constrain the condensationprocesses. Finally, this generic grid can be used to plan future observationsusing the HST, VLT, JWST and various other telescopes. The fine variation ofparameters in the grid also allows it to be incorporated in a retrievalframework, with various machine learning techniques.

Fully scalable forward model grid of exoplanet transmission spectra