Calibration uncertainties during supernova light-curve fitting cause roughly 50% degradation in dark energy figure of merit for Stage IV surveys, dominating over 13% degradation from model training errors and showing near-degeneracy with cosmology.
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A hyperbolic secant profile with standard deviation 0.328 pixels best fits charge diffusion in the Roman detector across 850-2000 nm with no detectable wavelength dependence.
Effective PSF models on OpenUniverse Roman simulations recover stellar fluxes to 0.6-1.2% precision, with up to 20% improvement from dividing chips into sub-SCAs and measured non-linearity exceeding some requirements.
citing papers explorer
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Calibration-Induced Systematics in SALT3 Training and Their Impact on Dark Energy Constraints from Stage IV Supernova Surveys
Calibration uncertainties during supernova light-curve fitting cause roughly 50% degradation in dark energy figure of merit for Stage IV surveys, dominating over 13% degradation from model training errors and showing near-degeneracy with cosmology.
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Charge diffusion and modulation transfer function in a Nancy Grace Roman Space Telescope detector
A hyperbolic secant profile with standard deviation 0.328 pixels best fits charge diffusion in the Roman detector across 850-2000 nm with no detectable wavelength dependence.
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Initial Characterization of Stellar Photometry of Roman images from the OpenUniverse Simulations
Effective PSF models on OpenUniverse Roman simulations recover stellar fluxes to 0.6-1.2% precision, with up to 20% improvement from dividing chips into sub-SCAs and measured non-linearity exceeding some requirements.