Parameter space of the selected effective temperatures Tc and luminosities Lc of the embedded companions. The coloured, solid lines show evolutionary tracks of planets and brown dwarfs as computed by Burrows et al. (1993, 1997). Sources used in our simulations are marked with red diamonds and indexed by letters (𝒜–𝒪) in the figure. The corresponding values for Tc and Lc are compiled in Table 1. The grey, dashed contour lines indicate the flux ratio between secondary and primary source in the M band (λ = 5 μm). As a comparison, the derived properties of HD 100546b from Quanz et al. (2015) are also indicated.