StarDICE: a photometric calibration experiment to anchor standard stars on the NIST flux scale at the milli-magnitude level
Résumé
The number of type Ia supernova observations will see significant growth within the next decade, especially thanks to the Legacy Survey of Space and Time (LSST) undertaken by the Vera Rubin Observatory in Chile. With this improvement, statistical uncertainties will decrease and flux calibration will be one of the dominant sources of systematic uncertainties for the characterization of dark energy. To address this issue, the StarDICE experiment proposes to recalibrate the spectra of CALSPEC standards stars at the millimagnitude level, securing calibration reference for any SNe Ia survey. The StarDICE experiment is currently operating at l’Observatoire de Haute-Provence and has been taking data since the beginning of 2023. To reach a sub-percent precision, the instrument throughput will be monitored with an LED-based artificial star source, calibrated on NIST photodiodes. I present here the first results of the StarDICE photometric analysis, and the predicted performance to recalibrate the CALSPEC standard stars.
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