Detectability of the reflected spectrum from Proxima b with SPHERE+ESPRESSO. The achievable SNR on the planetary cross-correlation function (CCF) is plotted as a function of exposure time. Four different planet-to-star contrasts from Turbet et al. (2016) are considered. From bottom to top: 4 × 10-8 (dry planet with CO2 atmosphere), 1 × 10-7 (synchronous Earth-like planet), 1.4 × 10-7 (Earth-like planet in 3:2 resonance), and 2 × 10-7 (Venus-like atmosphere with aerosols). The horizontal dashed line indicates SNR = 5.
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