Japan Geoscience Union Meeting 2016

Presentation information


Symbol P (Space and Planetary Sciences) » P-PS Planetary Sciences

[P-PS14] Origin and evolution of materials in space

Wed. May 25, 2016 9:00 AM - 10:25 AM 104 (1F)

Convener:*Shogo Tachibana(Department of Natural History Scieces, Hokkaido University), Hitoshi Miura(Graduate School of Natural Sciences, Department of Information and Biological Sciences, Nagoya City University), Takafumi Ootsubo(Graduate School of Arts and Sciences, University of Tokyo), Chair:Shogo Tachibana(Department of Natural History Scieces, Hokkaido University)

9:50 AM - 10:10 AM

[PPS14-04] ALMA observations of CO gas depletion in the protoplanetary disk around TW Hya

★Invited papers

*Hideko Nomura1, Takashi Tsukagoshi2, Ryohei Kawabe3, Daiki Ishimoto4,1, Satoshi Okuzumi1, Takayuki Muto5, Kazuhiro Kanagawa6, Shigeru Ida7, Catherine Walsh8, Tom J Millar9, Bai Xue-Ning10 (1.Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 2.College of Science, Ibaraki University, 3.National Astronomical Observatory of Japan, 4.Department of Astronomy, Graduate School of Science, Kyoto University, 5.Division of Liberal Arts, Kogakuin University, 6.University of Szczecin, 7.Earth-Life Science Institute, Tokyo Institute of Technology, 8.Leiden Observatory, Leiden University, 9.Astrophysics Research Centre, School of Mathematics and Physics, Queen’s University Belfast, 10.Institute for Theory and Computation, Harvard-Smithsonian Center for Astrophysics)

Keywords:protoplanetary disks, CO line emission, formation of organic molecules

Protoplanetary disks are the natal place of planets and ALMA observations are now revealing the physical and chemical structure of planet forming regions in the disks. Understanding chemical components of gas, dust and ice in the disks is essential to investigate the origins of materials in the plants. In the talk, I shall report our recent ALMA Band 7 observations of CO isotopologue lines from the protoplanetary disk around TW Hya. The result shows a significant decrement in CO gas throughout the disk even inside the CO snowline, indicating freeze-out of gas-phase CO onto grain surfaces and possible subsequent surface reactions to form larger molecules. Complex organic molecules could be efficiently produced in the observed CO gas depleted regions.