title: Disks around young substellar objects 

authors: Yumiko Oasa

abstract: The various scenarios for the formation of substellar objects have been proposed.
Whether substellar objects such as brown dwarfs and planetary mass objects have disks are intriguing as tracers of the formation process.
It is a necessary part of the core collapse scenario.

We have carried out a multiwavelength photometric and spectroscopic analysis of young substellar objects in NGC1333.
Our near-infrared photometric and Subaru spectroscopic observations reveal that there are very low-luminosity YSOs with cool temperatures.
The spectroscopic temperatures are consistent with those derived from a spectral energy distribution (SED) from our Z, J, H, K, and L-band ground-based photometry and Spitzer/IRAC photometry.
Their temperatures, together with their luminosities derived from J-band photometry, indicate that very low-luminosity young objects could be young substellar objects such as brown dwarfs and free-floating planetary-mass objects.
In addition, some young substellar objects exhibit significant infrared excess emission ascribed to the presence of circumsubstellar disks. 

We expect that ALMA will detect disks around brown dwarfs and planetary mass objects and provide a major step forward in our understanding of such very low-mass disks.