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'Isolated planetary mass objects' (IPMOs) have masses close to or below theDeuterium-burning mass limit (~15 Jupiter masses) -- at the bottom of thestellar initial mass function. We present an exploratory survey for disks inthis mass regime, based on a dedicated observing campaign with the SpitzerSpace Telescope. Our targets include the full sample of spectroscopicallyconfirmed IPMOs in the Sigma Orionis cluster, a total of 18 sources. In themass range 8... 20 MJup, we identify 4 objects with >3sigma colour excess at awavelength of 8.0mu, interpreted as emission from dusty disks. We thusestablish that a substantial fraction of IPMOs harbour disks with lifetimes ofat least 2-4 Myr (the likely age of the cluster), indicating an origin fromcore collapse and fragmentation processes. The disk frequency in the IPMOsample is 29% (16-45%) at 8.0mu, very similar to what has been found for starsand brown dwarfs (~30%). The object SOri70, a candidate 3 MJup object in thiscluster, shows IRAC colours in excess of the typical values for field T dwarfs(on a 2sigma level), possibly due to disk emission or low gravity. This is anew indication for youth and thus an extremely low mass for SOri70.

Dusty disks at the bottom of the IMF