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We have performed a search for planetary-mass brown dwarfs in the ChamaeleonI star-forming region using proper motions and photometry measured from opticaland infrared images from the Spitzer Space Telescope, the Hubble SpaceTelescope, and ground-based facilities. Through near-infrared spectroscopy atGemini Observatory, we have confirmed six of the candidates as new late-typemembers of Chamaeleon I >M7.75. One of these objects, Cha J11110675-7636030,has the faintest extinction-corrected M_K among known members, whichcorresponds to a mass of 3-6 M_Jup according to evolutionary models. Thatobject and two other new members have redder mid-IR colors than youngphotospheres at <M9.5, which may indicate the presence of disks. However, sincethose objects may be later than M9.5 and the mid-IR colors of youngphotospheres are ill-defined at those types, we cannot determine conclusivelywhether color excesses from disks are present. If Cha J11110675-7636030 doeshave a disk, it would be a contender for the least-massive known brown dwarfwith a disk. Since the new brown dwarfs that we have found extend below ourcompleteness limit of 6-10 M_Jup, deeper observations are needed to measure theminimum mass of the initial mass function in Chamaeleon I.

A survey for planetary-mass brown dwarfs in the Chamaeleon I star-forming region