  We assess broadband color filters for the two fast cameras on the PLAnetary
Transits and Oscillations (PLATO) of stars space mission with respect to
exoplanetary atmospheric characterization. We focus on Ultra Hot Jupiters and
Hot Jupiters placed 25pc and 100pc away from the Earth and low mass low density
planets placed 10pc and 25pc away. Our analysis takes as input literature
values for the difference in transit depth between the broadband lower (500 to
675nm) wavelength interval (hereafter referred to as blue) and the upper
(675-1125nm) broadband wavelength interval (hereafter referred to as red) for
transmission, occultation and phase curve analyses. Planets orbiting main
sequence central stars with stellar classes F, G, K and M are investigated. We
calculate the signal-to-noise ratio with respect to photon and instrument noise
for detecting the difference in transit depth between the two spectral
intervals. Results suggest that bulk atmospheric composition and planetary
geometric albedos could be detected for (Ultra) Hot Jupiters up to about 100pc
(about 25pc) with strong (moderate) Rayleigh extinction. Phase curve
information could be extracted for Ultra Hot Jupiters orbiting K and G dwarf
stars up to 25pc away. For low mass low density planets, basic atmospheric
types (primary and water-dominated) and the presence of sub-micron hazes in the
upper atmosphere could be distinguished for up to a handful of cases up to
about 10pc.
