Poster abstract details

HABITABILITY IN EXOPLANETS: the extremophilic zone


ABSTRACT: About 900 exoplanets have been discovered until today. We cast in this study the more favorable ones to harbor life from an astrobiological point of view. In order to examine how possible for life forms to dwell in some of them, we peered the physical conditions on their surfaces. As the albedo depends strongly on the presence of an atmosphere, it is supposed those exoplanets to have an Earth-like atmosphere. As CO2 is the main agent for the greenhouse effect to occur, we set its partial pressure as a free parameter in order to cover more extended conditions than those occurring on Earth. We did the same for hypothetical moons orbiting gaseous giant planets discovered in the Habitable Zone (HZ) of their stars. The biological characteristics of many terrestrial extremophiles make them able to survive on the surface of some known exoplanets. We thus propose to define exoplanetary habitability as an Extremophile Zone (EZ) which is an extension of the concept of HZ taking into account biologically more robust life forms.