The Great Advantage of Larger Apertures for Exoplanet Characterization

Details The Great Advantage of Larger Apertures for Exoplanet Characterization The Great Advantage of Larger Apertures for Exoplanet Characterization

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21915506p&link_type=abstract

American Astronomical Society, AAS Meeting #219, #155.06

Astronomy and Astrophysics

Astronomy

Scientific paper

Large apertures offer major advantages for space-based missions seeking to characterize the atmospheric properties and surface features of terrestrial exoplanets in the Habitable Zones around their host stars. Stellar sample size scales approximately as the cube of the aperture diameter. The effects of a given exozodi background level diminish with increasing aperture. Coronagraph tolerances are substantially relaxed if the inner working angle required corresponds to 4 x lambda/D or more. The distance to which one can measure temporal variations in broadband photometry as the exoplanet rotates is extended substantially as aperture increases. Larger apertures also facilitate the measurement of time-variations in the spectra of exoplanets. We present a summary of how the above key parameters of exoplanet characterization surveys scale with telescope aperture.

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