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The yield of Earth-like planets will likely be a primary science metric forfuture space-based missions that will drive telescope aperture size. Maximizingthe exoEarth candidate yield is therefore critical to minimizing the requiredaperture. Here we describe a method for exoEarth candidate yield maximizationthat simultaneously optimizes, for the first time, the targets chosen forobservation, the number of visits to each target, the delay time betweenvisits, and the exposure time of every observation. This code calculates boththe detection time and multi-wavelength spectral characterization time requiredfor planets. We also refine the astrophysical assumptions used as inputs tothese calculations, relying on published estimates of planetary occurrencerates as well as theoretical and observational constraints on terrestrialplanet sizes and classical habitable zones. Given these astrophysicalassumptions, optimistic telescope and instrument assumptions, and our newcompleteness code that produces the highest yields to date, we suggest lowerlimits on the aperture size required to detect and characterize astatistically-motivated sample of exoEarths.

Lower Limits on Aperture Size for an ExoEarth-Detecting Coronagraphic Mission