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Fig. 2


Near-infrared 2MASS CMD for stars in the TGAS 25 pc sample with photometric quality ‘AAA’ in the 2MASS catalogue (black plus signs) and for selected CPM companions (see text) from UCAC5 (filled red diamonds). Their absolute magnitudes MJ are based on TGAS parallaxes. Four known WDs in TGAS and three known WD companions in UCAC5 are marked byblue crosses. Our WD candidates (see Eqs. (3) and (4)) fall below both dashed lines in this figure and in Fig. 3, respectively. The dotted line shows the dividing line at JKs =+0.5 between WDs and cool subdwarfs (sd) found by Subasavage et al. (2017). Also shown are normal (not flagged asatypical, and not known as close binaries) late-M (green open triangles), and early-L dwarfs (magenta open squares) as well as late-M and L subdwarfs (cyan open diamonds), indicated by their spectral types, from Dupuy & Liu (2012) based on their parallaxes with relative errors less than 10%. Three new WD companion candidates are numbered. All CPM candidates with angular separations >900 arcsec are labelled with question marks.

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