(Proposal ID) S10A-067 (PI) Nomura, Hideko (Proposal Title) Spatially Resolved [OI] 6300 Angstrom Line Emission from Young Circumstellar Disks (Abstract) We propose the spatially resolved observations of the [OI] 6300Angstrom line emission from young circumstellar disks, using the integral field spectrograph (IFS) mode of Kyoto tridimensional spectrograph II (3DII). Historically UV/ optical/infrared transition lines have been used as a probe of shocks in jets/ outflows associated with young stars. However, recent observations with high spectral and high spatial resolution have made it possible to detect quiescent transition lines which are expected to originate from the inner planet-forming region of the circumstellar disks. In this work we make first attempt to obtain spectroscopic mapping of spatially extended, quiescent [OI] 6300 Angstrom line emission from the disks. The unique fine sampling (~ 0".1) and accurate point spread function of Subaru/Kyoto 3DII/IFS enable us to reveal the spatial distribution of the [OI] line emitting region with sufficiently high spatial resolution. The obtained maps of the gaseous component are expected to be comparable to the dust component observed as scattering light or thermal emission at optical/infrared, and detailed analysis of the maps together with detailed disk modelling, could give us some implication for the existence of planets inside the disks.