Table 1: IRAC/ Spitzer photometry (magnitudes) of $\sigma $ Orionis planetary-mass candidates with infrared excesses.
Object Sp.T. J [3.6] [4.5] [5.8] [8.0] I-J $J-K_{\rm s}$
S Ori 54 M9.5 18.00 $\pm$ 0.05 16.01 $\pm$ 0.15 15.97 $\pm$ 0.16 15.26 $\pm$ 0.32 14.45 $\pm$ 0.52 3.31 $\pm$ 0.06  
S Ori 55 M9 18.22 $\pm$ 0.10 16.61 $\pm$ 0.12 16.27 $\pm$ 0.13 15.60 $\pm$ 0.37 14.87 $\pm$ 0.38 3.30 $\pm$ 0.10 1.22 $\pm$ 0.14
S Ori J053956.8-025315   18.27 $\pm$ 0.08 16.55 $\pm$ 0.13 16.48 $\pm$ 0.22 15.88 $\pm$ 0.46 14.45 $\pm$ 0.33 2.98 $\pm$ 0.08 1.09 $\pm$ 0.10
S Ori 56 L1/L0.5 18.44 $\pm$ 0.10 16.10 $\pm$ 0.09 15.89 $\pm$ 0.10 15.37 $\pm$ 0.29 14.86 $\pm$ 0.39 3.30 $\pm$ 0.11 1.35 $\pm$ 0.14
S Ori 58 L0 18.60 $\pm$ 0.10 16.49 $\pm$ 0.11 16.40 $\pm$ 0.14 15.77 $\pm$ 0.44 14.86 $\pm$ 0.55 3.32 $\pm$ 0.11 1.73 $\pm$ 0.14
S Ori J053858.6-025228   18.61 $\pm$ 0.08 16.29 $\pm$ 0.11 15.97 $\pm$ 0.13 15.83 $\pm$ 0.50 $\ge$15.15 3.58 $\pm$ 0.09 1.32 $\pm$ 0.10
S Ori 60 L2/L5.5 19.05 $\pm$ 0.10 16.47 $\pm$ 0.11 16.59 $\pm$ 0.18 $\ge$16.0 14.85 $\pm$ 0.42 3.47 $\pm$ 0.11 1.75 $\pm$ 0.14

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