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SONYC, short for "Substellar Objects in Nearby Young Clusters", is a surveyprogram to provide a census of the substellar population in nearby star formingregions. We have conducted deep optical and near-infrared photometry in fiveyoung regions (NGC1333, rho Ophiuchi, Chamaeleon-I, Upper Sco, and Lupus-3),combined with proper motions, and followed by extensive spectroscopic campaignswith Subaru and VLT, in which we have obtained more than 700 spectra ofcandidate low-mass objects. We have identified and characterized more than 60new substellar objects, among them a handful of objects with masses close to,or below the Deuterium burning limit. Through SONYC and surveys by othergroups, the substellar IMF is now well characterized down to ~ 5 - 10 MJup, andwe find that the ratio of the number of stars with respect to brown dwarfs liesbetween 2 and 6. A comprehensive survey of NGC 1333 reveals that, down to~5MJup, free-floating objects with planetary masses are 20-50 times lessnumerous than stars, i.e. their total contribution to the mass budget of theclusters can be neglected.

The SONYC survey: Towards a complete census of brown dwarfs in star forming regions