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Abstract: Protoplanetary disks PPDs surrounding young stars are short-lived ~0.3-10Myr, compact ~10-1000 AU rotating reservoirs of gas and dust. PPDs arebelieved to be birthplaces of planetary systems, where tiny grains areassembled into pebbles, then rocks, planetesimals, and eventually planets,asteroids, and comets. Strong variations of physical conditions temperature,density, ionization rate, UV-X-rays intensities make a variety of chemicalprocesses active in disks, producing simple molecules in the gas phase andcomplex polyatomic organic species on the surfaces of dust particles. In thisentry, we summarize the major modern observational methods and theoreticalparadigms used to investigate disk chemical composition and evolution, andpresent the most important results. Future research directions that will becomepossible with the advent of the Atacama Large Millimeter Array ALMA and otherforthcoming observational facilities are also discussed.

Autor: Dmitry Semenov Max Planck Institute of Astronomy


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