[S-IT21] Understanding the first 150 million years of the solar system

[SIT21-01] Planet formation and astrochemistry in protoplanetary disks through theoretical modeling and astronomical observations with ALMA

★Invited Papers

*Shota Notsu¹ (1.Earth and Planetary System Science Group, Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo)

Keywords:Protoplanetary Disks, Astrochemistry, ALMA, Snowline, Sootline, Planet Formation

Planets form and obtain their compositions in protoplanetary disks around young stars. The chemical compositions of gas and solid dust grains in these planet-forming disks will decide planetary elemental compositions and molecular compositions including water and organic molecules. Chemical structures in protoplanetary disks are determined by a combination of in situ chemical reactions and inheritance from molecular clouds and protostellar envelopes. In addition, positions of "snowlines" (sublimation fronts of molecules) always influence planet formation, since they determine the elemental content of solids and gas at different locations in protoplanetary disks. Recently the position of carbon "sootline" will be also important in the context of carbon depletion in terrestrial planets.

Recently, in addition to updates in theoretical modeling studies, astronomical observations with ALMA (Atacama Large Millimeter/submillimeter Array) have investigated the spatial distributions of volatiles (C/N/O/S/H) and detected organic molecules in protoplanetary disks. In this review talk, we introduce some important research topics (mainly ALMA observations) about planet formation and astrochemistry in protoplanetary disks, and also discuss future prospects in this field and potential synergies with studies about solar system sciences.