Molecular line observations of protoplanetary disks 

Edwige Chapillon

Understanding the structure and evolution of
disks surrounding young stars is one of the key issues to study the
process of planet formation. Nevertheless the overall properties of
those disks are not yet well constrained by observations. Several other
molecules than CO and its isotopologues have been detected in the outer
part of the disks in the millimeter domain and molecular tracers bring
some constraints on the disk physical structure since different
molecules sample different physical conditions. 

The CID (Chemistry In Disk) consortium is a collaboration between 
astrochemists and specialist
of millimeter observations that aims to study the chemistry of
protoplanetary disks. In this talk I will present recent results
obtained by the CID project from molecular line observations, and
confront them to theoretical models of proto-planetary disks, in
particular to the the layered structure that all chemical models
predict.