An HWO-like survey needs about 30 Earth-sized planets to recover a strong albedo step at the habitable zone, but 80-90 for weaker trends.
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Bioverse: Assessing the Ability of Direct Imaging Surveys to Empirically Constrain the Habitable Zone via Trends in Albedo
An HWO-like survey needs about 30 Earth-sized planets to recover a strong albedo step at the habitable zone, but 80-90 for weaker trends.