Absolute Ks (top) and J (bottom) magnitudes as a function of optical spectral type for objects of various ages. Our sample is plotted as filled circles with error bars. All objects are labeled. The field sequence of dwarfs is defined by the sample of Dupuy & Liu (2012, small dots). Young field dwarfs with parallax measurements given by Faherty et al. (2012, 2013) are shown with open squares. The mean sequence of Pleiades dwarfs (120 Myr) is depicted by a solid line (it goes from the mid-Ms to L4). The youngest objects (σ Ori cluster, ~3 Myr) are illustrated with open diamonds. We do not show the error bars of all objects from the literature for the clarity of the figure. For clarity, our targets are also slightly shifted in spectral type. Photometry is in the 2MASS system.
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