Simulated spectrum of Proxima b in the O2 bands, assuming 60 nights of observations with SPHERE+ESPRESSO. The flat-albedo model comprising only the reflected stellar component and telluric absorption is shown in red, while the full model including O2 absorption from the planet is shown in black. The top, middle, and bottom panels show portions of the O2γ-, B-, and A-bands, respectively. We note that the direct stellar component, which dominates the observed spectrum, has been subtracted. The plotted model spectra are noise-free. Actual noise levels in this simulation are at the level of 200 e-/pixel (for K = 5000).
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