Climate states on exoplanets with the same atmospheric composition create different reflectance spectra, changing the detectability of atmospheric features and biosignatures, with seasonal variations on high-obliquity worlds adding time-dependent signals.
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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.
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Impact of Climate States and Seasons on Future Exo-Earth Observations
Climate states on exoplanets with the same atmospheric composition create different reflectance spectra, changing the detectability of atmospheric features and biosignatures, with seasonal variations on high-obliquity worlds adding time-dependent signals.
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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.