SPICA Science Conference from Exoplanets to Distant Galaxies: SPICA's New Window on the Cool Universe (June 18-21, 2013. Ito Hall, the University of Tokyo), Bunkyou-ku, Tokyo, Japan
How are planetary systems formed? How is life created? As an approach to these subjects, we propose a study of chemical evolution of solid materials in planet-forming disks based on observations with the SPICA Coronagraph Instrument (SCI). We focus on silicate grains and hydrocarbon molecules including polycyclic aromatic hydrocarbons (PAHs) as origin of rocky-planets and life, respectively. Our solar system is believed to be made of materials originated in the interstellar space. However, in our solar system, there are many kinds of materials, which are not common in the interstellar space (e.g. crystalline silicates and complex organic molecules). They must be formed at planet-forming stages. Because each material has its own condition for generation, we can obtain clues for events which occur at planet-forming stages, through studies of evolution of these materials. AKARI performed all-sky surveys in six infrared photometric bands with the wavelengths from 9 to 160 micrometers. A global picture of life cycle of solid materials in our Galaxy has been revealed from these data. Solid materials are supplied from mass-losing old stars to the interstellar space, and then incorporated into star forming activities. During this cycle, solid materials are processed in local physical environments, changing the infrared spectroscopic features. Based on these scientific results, as a next step, we plan to make detailed analyses of the evolution of the solid materials in star- and planet-forming sites using the SPICA/SCI.
形態: カラー図版あり
Physical characteristics: Original contains color illustrations
資料番号: AA1730027070
レポート番号: JAXA-SP-17-010E