Contrastive alignment of SPHEREx spectra with DESI Legacy images improves star-galaxy separation, lifting image-only stellar purity from 76% to 93% and forecasting sub-percent SPHEREx contamination at p>0.7.
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A Multimodal Approach to Star--Galaxy Separation using SPHEREx Spectrophotometry and DESI Legacy Survey Imaging
Contrastive alignment of SPHEREx spectra with DESI Legacy images improves star-galaxy separation, lifting image-only stellar purity from 76% to 93% and forecasting sub-percent SPHEREx contamination at p>0.7.