JpGU-AGU Joint Meeting 2017

講演情報

[EJ] ポスター発表

セッション記号 P (宇宙惑星科学) » P-PS 惑星科学

[P-PS04] [EJ] アルマによる惑星科学の新展開

2017年5月24日(水) 15:30 〜 17:00 ポスター会場 (国際展示場 7ホール)

コンビーナ:百瀬 宗武(茨城大学理学部)、小林 浩(名古屋大学理学研究科)、下条 圭美(国立天文台チリ観測所)、野村 英子(東京工業大学理学院地球惑星科学系)

[PPS04-P09] デブリ円盤​の[CI](3P1-3P0)輝線放射の検出

*樋口 あや1佐藤 愛樹2塚越 崇2坂井 南美1百瀬 宗武2小林 浩3石原 大助3渡邊 華3金田 英宏3岩﨑 一成4山本 智5 (1.理化学研究所、2.茨城大学、3.名古屋大学、4.同志社大学、5.東京大学)

キーワード:デブリ円盤

We have detected the [C I]3P13P0 emission in the gaseous debris disks, 49 Ceti and β Pictoris, with the Atacama Submillimeter Telescope Experiment (ASTE). The line profiles of [C I] is found to be those of CO(J=3–2) observed with the same telescope as well as the Atacama Large Millimeter/submillimeter Array (ALMA). This result suggests that the atomic carbon (C) coexists with CO in the debris disks, and is likely formed by photodissociation of CO. The C/CO column density ratio is thus derived to be 54±19 to 69±42 for 49 Ceti and β Pictoris, respectively. These ratios are higher than those of protoplanetary disks, molecular clouds, and diffuse clouds by an order of magnitude. From the result, we suggest that the origin of a large amount of [C I] in the debris disk would likely be a small amount of the H2 molecule in the gas disk. This implies a significant contribution of the secondary gas coming out from dust grains.