Experimental study on enstatite formation under circumstellar environments

• Project/Area Number: 15K17787
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Petrology/Mineralogy/Economic geology
• Research Institution: Kyoto University
• Principal Investigator: Takigawa Aki 京都大学, 白眉センター, 特定助教 (10750367)
• Project Period (FY): 2015-04-01 – 2017-03-31
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000); Fiscal Year 2016: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2015: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
• Keywords: 実験 / エンスタタイト / 凝縮 / 彗星塵 / 星周ダスト

Outline of Final Research Achievements

In order to understand the condensation conditions of enstatite in cometary materials, an experimental setup, which enables to control the temperatures of vapors and substrates, and the Mg/Si ration of the gases, was developed. Condensation experiments of gases with SiO2/(SiO2+MgO) of 0.05-0.9 were carried out and forsterite, and ortho- and clone-enstatite grains were obtained as condensates. The results indicate that not only supersaturation ratio but also a trace amount of cations are important to form clinoenstatite.

Research Products

• [Int'l Joint Research] Carnegie Institution of Washington/Naval Research Laboratory(米国)
• [Journal Article] Evaporation and condensation kinetics of corundum: the origin of the 13 μm feature of oxygen-rich agb stars (2015)
  • Author(s): Takigawa A., Tachibana S., Nagahara H., and Ozawa K.
  • Journal Title: Astrophys. J. Supplement Volume: 218 Issue: 1 Pages: 1-17
  • DOI: 10.1088/0067-0049/218/1/2
  • NAID: 120005668070
  • Peer Reviewed / Open Access
• [Journal Article] Organic Matter in the Unique Carbonaceous Chondrite Miller Range 07687: A Coordinated In Situ NanoSIMS, FIB-TEM, and XANES Study (2015)
  • Author(s): Davidson, J., Nittler, L. R., Stroud, R. M., Takigawa, A., De Gregorio, B. T., Alexander, C. M. O'D., Kilcoyne, A. L. D., and Cody, G. D.
  • Journal Title: Lunar and Planetary Science Conference Volume: 46 Pages: 1609-1609
  • Open Access / Int'l Joint Research
• [Journal Article] Condensation Coefficient of Forsterite in the H2-H2O-Mg2SiO4 System (2015)
  • Author(s): Tachibana, S. and Takigawa, A.
  • Journal Title: Lunar and Planetary Science Conference Volume: 46 Pages: 2192-2192
  • Open Access
• [Journal Article] H and He Ion Irradiation Experiments of Corundum: Amorphization of interstellar dust (2015)
  • Author(s): Takigawa, A., Matsumoto, T., Watanabe, N., Miyake, A., Yasuda, K., Nakata, Y., and Tsuchiyama, A.
  • Journal Title: Goldschmidt Conference Volume: - Pages: 3062-3062
  • Open Access
• [Presentation] 星周ダスト形成を模擬したMg-Si-O系での凝縮実験：Mg/Si比依存性 (2017)
  • Author(s): 瀧川 晶
  • Organizer: 日本地球惑星科学連合 連合大会 2017年大会
  • Place of Presentation: 幕張メッセ（千葉）
  • Year and Date: 2017-05-22
• [Presentation] Condensation experiments in the Mg-Si-O system (2017)
  • Author(s): Aki Takigawa
  • Organizer: Solar-System symposium in Sapporo 2017
  • Place of Presentation: ルスツリゾート（北海道）
  • Year and Date: 2017-02-14
  • Int'l Joint Research
• [Presentation] Microscopic and Telescopic Studies on Circumstellar Dust (2016)
  • Author(s): Aki Takigawa
  • Organizer: Pre-Forum Meeting on Future Cosmochemistry for the JSPS Forum 2016
  • Place of Presentation: Cosmos Club (ワシントンDC, USA)
  • Year and Date: 2016-06-09
  • Int'l Joint Research / Invited
• [Presentation] エンスタタイト凝縮実験に向けた装置改良とSiO2-MgO蒸発実験 (2016)
  • Author(s): 瀧川 晶
  • Organizer: 日本地球惑星科学連合 連合大会 2016年大会
  • Place of Presentation: 幕張メッセ（千葉）
  • Year and Date: 2016-05-25
• [Presentation] Formation and alteration history of a unique faceted presolar corundum (2016)
  • Author(s): Takigawa, Aki, Stroud, Rhonda M., Nittler, Larry R., Alexander, Conel M. O’D. and Miyake, Akira
  • Organizer: Formation and alteration history of a unique faceted presolar corundum
  • Place of Presentation: ルスツリゾート（北海道）
  • Year and Date: 2016-02-18
• [Presentation] Experimental Studies on Amorphization of Interstellar dust grains (2015)
  • Author(s): Takigawa, Aki, Matsumoto, Toru, Watanabe, Naoki, Miyake, Akira, Yasuda, Keisyuke, Nakata, Yasunori, and Tsuchiyama, Akira
  • Organizer: Grain Formation Workshop
  • Place of Presentation: 渓流荘 （北海道）
  • Year and Date: 2015-11-10
• [Presentation] コランダムの太陽風・星間粒子線照射による非晶質化過程の実験的研究 (2015)
  • Author(s): 瀧川晶，松本徹，渡部直樹，三宅亮，土`山明
  • Organizer: 日本惑星科学会2015年度秋季講演会
  • Place of Presentation: 東京工業大学（東京）
  • Year and Date: 2015-10-15
• [Presentation] Condensation Experiments of Forsterite and Corundum under Circumstellar Conditions (2015)
  • Author(s): Takigawa, A., and Tachibana, S.
  • Organizer: Silicate in space
  • Place of Presentation: Heidelberg(Germany)
  • Year and Date: 2015-09-28
• [Presentation] H and He Ion Irradiation Experiments of Corundum: Amorphization of interstellar dust (2015)
  • Author(s): Takigawa, A., Matsumoto, T., Watanabe, N., Miyake, A., Yasuda, K., Nakata, Y., and Tsuchiyama, A.
  • Organizer: Goldschmidt Conference
  • Place of Presentation: Prague (Czech Republic)
  • Year and Date: 2015-08-18
  • Int'l Joint Research
• [Presentation] ダスト形成実験，プレソーラー粒子分析，赤外線観測から探る宇宙鉱物の形成と進化 (2015)
  • Author(s): 瀧川晶
  • Organizer: 日本地球惑星科学連合2015年大会
  • Place of Presentation: 幕張メッセ国際会議場（千葉）
  • Year and Date: 2015-05-27
  • Invited