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The recent discovery of the planetary system hosted by the ultracool dwarfstar TRAPPIST-1 could open new perspectives into the investigation of planetaryclimates of Earth-sized exoplanets, their atmospheres and their possiblehabitability. In this paper, we use a simple climate-vegetation energy-balancemodel to study the climate of the seven TRAPPIST-1 planets and the climatedependence on the global albedo, on the fraction of vegetation that could covertheir surfaces and on the different greenhouse conditions. The model allows usto investigate whether liquid water could be maintained on the planetarysurfaces (i.e., by defining a "surface water zone") in different planetaryconditions, with or without the presence of greenhouse effect.  It is shown that planet TRAPPIST-1d seems to be the most stable from anEarth-like perspective, since it resides in the surface water zone for a widerange of reasonable values of the model parameters. Moreover, according to themodel outer planets (f, g and h) cannot host liquid water on their surfaces,even for Earth-like conditions, entering a snowball state. Although verysimple, the model allows to extract the main features of the TRAPPIST-1planetary climates.

Comparative Climates of TRAPPIST-1 planetary system: results from a simple climate-vegetation model