All Tables

Table 1: Basic log of the I- and J-band runs.
Table 2: Objects with signatures of extreme youth and cluster membership in the survey area compiled from the literature.
Table 3: Basic data of our $\sigma$ Orionis cluster members and candidates.
Table 4: Near-infrared follow-up photometry of our $\sigma$ Orionis cluster members and candidates.
Table 5: Log of the HK-band follow-up campaigns.
Table 6: Estimate of ultracool field dwarf contaminants.
Table A.1: New probable cluster non-members.