Protostars and Planets VI, Heidelberg, July 15-20, 2013

Poster 1B088

Observational constraints on Acrretion disk formation

Harsono, Daniel (Leiden observatory, SRON)
Jørgensen, Jes (StarPlan, University of Copenhagen)
van Dishoeck, Ewine (Leiden, MPE)
Hogerheijde, Michiel (Leiden)
Bruderer, Simon (MPE)
Persson, Magnus (Leiden)
Mottram, Joseph (Leiden)

Stable rotationally supported disks (RSDs) are important for the star and planet formation process. The structure and stability of the RSDs are linked to the accretion process onto the star and the evolution of the protostellar system. Additionally, these disks are composed of infalling material that encounter a wide range of physical conditions. The history of these changes affect the chemical structure and evolution of the accretion disk and, thus, the material out of which planets are formed. The formation of RSDs is not well understood and it is unclear from the existing data at which stage the young disks are rotationally supported. Here, we present new PdBI observations of 13CO and C18O toward 4 Class I YSOs with higher spatial resolution and significantly higher sensitivity than previously possible. The high quality data allow us to constrain the physical structure of the young embedded disks which are rotationally supported within the inner 100 AU radius. Furthermore, the extent of the RSD is smaller than that of the dust disk. The observed physical structure of embedded disks are compared to semi-analytical disk formation models which suggests that the formation process is consistent with inside-out formation. ALMA is needed to confirm the extent of the rotationally supported structure.

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