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We use Hubble Space Telescope multicolour photometry of the globular cluster47 Tucanae to uncover a population of 24 objects with no previousclassification that are outliers from the single-star model tracks in thecolour-magnitude diagram and yet are likely cluster members. By comparing thosesources with evolutionary models and X-ray source catalogues, we were able toshow that the majority of those sources are likely binary systems that do nothave any X-ray source detected nearby, most possibly formed by a white dwarfand a main-sequence star and a small number of possible double-degeneratesystems.

Outliers: multicolour photometry guiding the search for evolved binary systems in the globular cluster 47 Tucanae