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Previous generation of instruments have the opportunity to discover thousandsof extra-solar planets and more will come with the current and futureplanet-search missions. In order to go one step further in the characterizationof exoplanets, in this paper we describe a way to compare the photometricobservation of Hot Jupiters done with space telescopes such as HST, CHEOPS,TESS, PLATO, and JWST and give the first-hand characterization on theiratmospheres. We analyze a set of planetary systems hosting a Hot Jupiter forwhich an atmospheric template is available in the literature. For each system,we simulate the transit light curves observed by different instruments,convolving the incoming spectrum with the corresponding instrumentalthroughput. For each instrument, we thus measure the expected transit depth andestimate the associated uncertainty. Finally, we compare the transit depths asseen by the selected instruments and we quantify the effect of the planetaryatmosphere on multi-band transit photometry. We also analyze a set of simulatedscenarios with different stellar magnitudes, activity levels, transit durationsand atmospheric templates to find the best cases for this kind of observationalapproach. We find in general that current and especially future spacetelescopes provide enough photometric precision to detect significantdifferences between the transit depths at different wavelengths. In particular,we find that the chromatic effect due to the atmosphere of the Hot Jupiters ismaximized at later spectral types and that the effect of stellar activity issmaller than the measurement uncertainties.

Synergies between space telescopes in the photometric characterization of the atmospheres of Hot Jupiters