BIOSIGNATURES AND EXTRASOLAR PLANET CHARACTERIZATION: VISIBLE VERSUS INFRARED

摘要

The physical bases of the detection and characterisation of extrasolar Earth-like planets and of biosig-natures in the reflected light and thermal emission regimes are reviewed. Both approaches have their advantages and disadvantages, including artefacts, in the determination of planet physical parameters (mass, size, albedo, surface and atmospheric conditions etc) and biosignatures. New perspectives for these different aspects are presented.