Department of Complexity Science and Engineering, Graduate School of Frontier Science, Universityof Tokyo
Department of Complexity Science and Engineering, Graduate School of Frontier Science, Universityof Tokyo
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)(ISAS)
Planetary Exploration Research Center, Chiba Institute of Technology
Department of Complexity Science and Engineering, Graduate School of Frontier Science, Universityof Tokyo : Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)(ISAS) : Planetary Exploration Research Center, Chiba Institute of Technology
出版者
宇宙航空研究開発機構宇宙科学研究所 (JAXA)(ISAS)
出版者（英）
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)(ISAS)
雑誌名
第43回月・惑星シンポジウム
雑誌名(英)
Proceedings of the 43th ISAS Lunar and Planetary Symposium
43rd ISAS Lunar and Planetary Symposium (August 4-6, 2010. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)(ISAS)), Sagamihara, Kanagawa Japan
抄録（英）
Exogenic delivery of organic molecules by cometary/asteroidal impacts is one of the most important candidates for organic supply on prebiotic Earth. Its mechanism, however, is not simple; most of organics originally contained in impacting objects are decomposed by initial impact heating and subsequent interaction of ambient atmosphere. Such decomposed organics may actually lead to synthesis of simple but chemically active organic molecules within impact vapor plumes, particularly for oblique impacts. The details of physical and chemical processes in the cloud, nevertheless, are not understood well yet. Thus, we conducted time-series spectroscopic and band-pass imaging observation of vapor clouds due to oblique impacts using a two-stage light gas gun to characterize their thermodynamic conditions. We measured velocity and blackbody temperature of these clouds as functions of time. Obtained data indicate that high-speed projectile fragments are vaporized at much higher rate than previous estimates. Such high vaporization efficiency may lead to higher rate of organic production within impact vapor plumes. Thus, such on-site organic resynthesize within impact-vapor clouds may have played a more important role in the origin of life than previously considered.
内容記述
形態: カラー図版あり
内容記述（英）
Physical characteristics: Original contains color illustrations
High-Speed Time-Series Spectroscopic and Imaging Observations on Aerodynamic Ablation Processes within Vapor Plumes due to Oblique Impacts
