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We present the results for the detectability of the O2 and O3 molecularspecies in the atmosphere of an Earth-like planet using reflected light at thevisible wavelengths. By quantifying the detectability as a function ofsignal-to-noise ration (SNR), we can constrain the best methods to detect thesebiosignatures with nest-generation telescopes designed for high-contrastcoronagraph. Using 25 bandpasses between 0.515 and 1 micron, and apre-constructed grid of geometric albedo spectra, we examined the spectralsensitivity needed to detect these species for a range of molecular abundances.We first replicate a modern-Earth twin atmosphere to study the detectability ofcurrent O2 and O3 levels, and then expand to a wider range of literature-drivenabundances for each molecule. We constrain the optimal 20%, 30%, and 40%bandpasses based on the effective SNR of the data, and define the requirementsfor the possibility of simultaneous molecular detection. We present ourfindings of O2 and O3 detectability as functions of SNR, wavelength, andabundance, and discuss how to use these results for optimizing futureinstrument designs. We find that O2 is detectable between 0.64 and 0.83 micronwith moderate-SNR data for abundances near that of modern-Earth and greater,but undetectable for lower abundances consistent with a Proterozoic Earth. O3is detectable only at very high SNR data in the case of modern-Earthabundances, however it is detectable at low-SNR data for higher O3 abundancesthat can occur from efficient abiotic O3 production mechanisms.

Bayesian Analysis for Remote Biosignature Identification on exoEarths  (BARBIE) II: Using Grid-Based Nested Sampling in Coronagraphy Observation  Simulations for O2 and O3