Abstract
The study and characterization of the exoplanets’ atmospheres and composition is in its infancy. The large facilities that will make feasible to image an exo-Earth are currently under study. This contribution to the special issue on “detection and characterization of extrasolar planets” is a summary on the current status of the design studies to build large space-based facilities working in the 100–3000 nm range for this purpose. The three basic designs: Fresnel imagers, starshades, and coronagraphs on large space telescopes are described. An outline of the pros and cons for each design is provided. The relevance of transmission spectroscopy to characterize exoplanets atmospheres is pointed out.
Highlights
Band-limited coronagraphs are the preferred option for space telescopes destructive interference
Band-limited coronagraphs are the preferred option for space telescopes and and already implemented the Hubble
Coronagraphs are widely used in astronomy and have proven to be a valuable tool to resolve faint structures around bright objects observing and characterizing exo-Earths is a significant challenge
Summary
After this realization, there are two main lines of research: (1) characterizing exoplanets
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