A deep staring campaign in the σ Orionis cluster - Variability in substellar members P. Elliott, A. Scholz, R. Jayawardhana, J. Eislöffel and E. M. Hébrard A&A, 608 (2017) A66 Published online: 07 December 2017 DOI: 10.1051/0004-6361/201730973