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.
Snellen , `` Exoplanet atmospheres at high spectral resolution ,'' arXiv e-prints , arXiv:2505.08926 (2025)
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Ground-based VLT/CRIRES+ transmission spectroscopy detects CO and H2O in WASP-107 b, confirming JWST results while highlighting reduced error budgets and cloud sensitivity for cooler exoplanets.
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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.
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VLT/CRIRES+ observations of warm Neptune WASP-107 b: Challenges in detecting molecules with ground-based transmission spectroscopy of cooler and cloudy exoplanets
Ground-based VLT/CRIRES+ transmission spectroscopy detects CO and H2O in WASP-107 b, confirming JWST results while highlighting reduced error budgets and cloud sensitivity for cooler exoplanets.