Moderate to high spectral resolution (R>1000) provides higher sensitivity for detecting key molecules like H2O and O2 in Earth analogs than low resolution (R~140), as correlated speckle noise can suppress detections at low resolutions.
Wang , `` Early Accretion of Large Amounts of Solids for Directly Imaged Exoplanets ,'' 981 , 138 (2025)
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Characterizing Earth analogs may require a moderate or high-resolution spectrograph
Moderate to high spectral resolution (R>1000) provides higher sensitivity for detecting key molecules like H2O and O2 in Earth analogs than low resolution (R~140), as correlated speckle noise can suppress detections at low resolutions.