CVSO 30, CVSO 30 c, and comparison objects, superimposed onto the colour data from Hewett et al. (2006). CVSO 30 c clearly stands out in the lower left corner, approximately consistent with colours of giants, early-M and early-T dwarfs, and free-floating planetary mass objects (Zapatero Osorio et al. 2000; Peña Ramírez et al. 2012), e.g. consistent with absolute magnitude and J−Ks colour of S Ori 64. Its unusual blue colour can most likely be attributed to the youth of these objects (Saumon & Marley 2008), leading to L–T transition opacity drop at high brightnesses (see Fig. 11). See Fig. A.5 for details. For CVSO 30 c we give the colours before (grey) and after (red) correcting for the NACO to the 2MASS filter set and we give the maximum possible systematic photometric offsets caused by the variability of the primary star that is used as reference (black).
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