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Fig. 3.

image

Color-magnitude diagram showing our observed targets together with known substellar objects from the literature. The blue, magenta, and yellow markers show the binary candidates 2M1510, 2M1547, and 2M2202, respectively, where the primaries are illustrated by the diamonds and the squares represent the secondary binary components. Unresolved and single sources in our survey are shown by circles only. We include low-mass stars and BDs from Dupuy & Liu (2012) as smaller circles, which have been color coded on a spectrum shown by the color bar in the figure, going from late M type to early T type. We only include objects from the list that have known spectral type and Gaia parallaxes. The gray triangles show low-mass objects from the BANYAN survey (Gagné et al. 2015), where the downward-pointing triangles show field dwarfs, and the upward-pointing triangles show objects with low surface gravity and strong signs of youth. Photometry is based on 2MASS bands for all sources. Most of our sources seem to be on the redder side in the diagram, suggesting some extinction by being dusty, which could be considered as a sign of youth.

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