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Within the SONYC - Substellar Objects in Nearby Young Clusters - survey, weinvestigate the frequency of free-floating planetary-mass objects (planemos) inthe young cluster NGC1333. Building upon our extensive previous work, wepresent spectra for 12 of the faintest candidates from our deep multi-bandimaging, plus seven random objects in the same fields, using MOIRCS on Subaru.We confirm seven new sources as young very low mass objects (VLMOs), with Teffof 2400-3100K and mid-M to early-L spectral types. These objects add to thegrowing census of VLMOs in NGC1333, now totaling 58. Three confirmed objects(one found in this study) have masses below 15 MJup, according to evolutionarymodels, thus are likely planemos. We estimate the total planemo population with5-15 MJup in NGC1333 is <~8. The mass spectrum in this cluster is wellapproximated by dN/dM ~ M^-alpha, with a single value of alpha = 0.6+/-0.1 forM<0.6Msol, consistent with other nearby star forming regions, and requiresalpha <~ 0.6 in the planemo domain. Our results in NGC1333, as well as findingsin several other clusters by ourselves and others, confirm that the starformation process extends into the planetary-mass domain, at least down to 6MJup. However, given that planemos are 20-50 times less numerous than stars,their contribution to the object number and mass budget in young clusters isnegligible. Our findings disagree strongly with the recent claim from amicrolensing study that free-floating planetary-mass objects are twice ascommon as stars - if the microlensing result is confirmed, those isolatedJupiter-mass objects must have a different origin from brown dwarfs andplanemos observed in young clusters.

Substellar Objects in Nearby Young Clusters (SONYC) VI: The planetary-mass domain of NGC1333