Exploring planetary surface material evolution

• Project/Area Number: 16H04044
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Solid earth and planetary physics
• Research Institution: Japan Aerospace EXploration Agency
• Principal Investigator: Abe Masanao 国立研究開発法人宇宙航空研究開発機構, 宇宙科学研究所, 准教授 (00270439)
• Co-Investigator(Kenkyū-buntansha): 矢田 達 国立研究開発法人宇宙航空研究開発機構, 宇宙科学研究所, 主任研究開発員 (00294877)
• Research Collaborator: Watanabe naoki ; Tsuchiyama akira ; Nakato aiko ; Matsumoto toru ; Nakauchi yusuke ; Takigawa aki ; Asada yuma
• Project Period (FY): 2016-04-01 – 2019-03-31
• Project Status: Completed (Fiscal Year 2018)
• Budget Amount: ¥16,640,000 (Direct Cost: ¥12,800,000、Indirect Cost: ¥3,840,000); Fiscal Year 2018: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000); Fiscal Year 2017: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000); Fiscal Year 2016: ¥9,360,000 (Direct Cost: ¥7,200,000、Indirect Cost: ¥2,160,000)
• Keywords: 小惑星 / 太陽風 / 水 / 反射スペクトル / リモートセンシング / 宇宙風化 / 惑星起源・進化 / 惑星探査 / 固体地球物理学

Outline of Final Research Achievements

Hydrogen ion irradiation experiments were conducted to simulate the solar wind on the asteroid surface analog material. It was found that a change in the absorption band with respect to water occurs in the 3 μm band of the reflection spectrum when the samples were irradiated with 1 keV H+ ions with dose of 1E+18 ions/cm2. This is considered to be a change due to the newly generated water-containing mineral by ion irradiation. In addition, the cross section of the irradiated silicate mineral is observed with a transmission electron microscope, and the ion irradiated mineral surface is amorphous, and bubbles called blisters are formed at a depth of several tens of nm from the mineral surface. The spectral change reproduced in the experiment may explain the characteristics of the reflection spectrum observed by Hayabusa 2.

Academic Significance and Societal Importance of the Research Achievements

月や小惑星など大気の無い太陽系天体表面では、太陽風と呼ばれるイオンが常に照射されている。この太陽風によって、無水の天体表面に水や含水鉱物が形成されている可能性が近年指摘され、月ではその特徴が見つかっていると同時に、はやぶさ２でも小惑星表層に同様な特徴を発見した。この原因を探るために、本研究では太陽風を模擬したイオン照射を太陽系天体表層を模擬した物質に照射し、同様な反射スペクトルの特徴の変化を起こすことに成功した。このような水の生成機構を解明することで、将来の人間の宇宙進出における資源利用の可能性が開かれるだけでなく、太陽系における水の生成や輸送と天体の進化の関係を明らかにすることにもつながる。

Research Products

• [Journal Article] The surface composition of asteroid 162173 Ryugu from Hayabusa2 near-infrared spectroscopy (2019)
  • Author(s): Kitazato K. et al.
  • Journal Title: Science Volume: 364 Issue: 6437 Pages: 272-275
  • DOI: 10.1126/science.aav7432
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Hayabusa2 arrives at the carbonaceous asteroid 162173 Ryugu?A spinning top?shaped rubble pile (2019)
  • Author(s): Watanabe S.、Hirabayashi M.、Hirata N. et al.
  • Journal Title: Science Volume: 364 Issue: 6437 Pages: 268-272
  • DOI: 10.1126/science.aav8032
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] The geomorphology, color, and thermal properties of Ryugu: Implications for parent-body processes (2019)
  • Author(s): Seiji Sugita, R. Honda, T. Morota, S. Kameda, H. Sawada, E. Tatsumi, M. Yamada, C. Honda, Y. Yokota, T. Kouyama, N. Sakatani, K. Ogawa, H. Suzuki, T. Okada, N. Namiki, S. Tanaka, Y. Iijima, K. Yoshioka, M. Hayakawa, Y. Cho, M. Matsuoka, N. Hirata, N. Hirata, H. Miyamoto, Jun Kimura
  • Journal Title: Science Volume: 17 Issue: 6437 Pages: 252-252
  • DOI: 10.1126/science.aaw0422
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Physical properties of near-Earth asteroids with a low delta-v: Survey of target candidates for the Hayabusa2 mission (2018)
  • Author(s): Hasegawa Sunao、他４２名
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 70 Issue: 6 Pages: 114-114
  • DOI: 10.1093/pasj/psy119
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Collisional history of asteroid Itokawa (2017)
  • Author(s): Jourdan F., Timms N. E., Eroglu E., Mayers C., Frew A., Bland P. A., Collins G. S., Davison T.M., Abe M., and Yada T.
  • Journal Title: GEOLOGY Volume: 45 Pages: 819-822
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] An evaluation method of reflectance spectra to be obtained by Hayabusa2 Near-Infrared Spectrometer (NIRS3) based on laboratory measurements of carbonaceous chondrites (2017)
  • Author(s): Matsuoka Moe、Nakamura Tomoki、Osawa Takahito、Iwata Takahiro、Kitazato Kohei、Abe Masanao、Nakauchi Yusuke、Arai Takehiko、Komatsu Mutsumi、Hiroi Takahiro、Imae Naoya、Yamaguchi Akira、Kojima Hideyasu
  • Journal Title: Earth, Planets and Space Volume: 69 Issue: 1 Pages: 120-120
  • DOI: 10.1186/s40623-017-0705-4
  • NAID: 120006472642
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Hayabusa2 Sampler: Collection of asteroidal surface material. (2017)
  • Author(s): Sawada, H., Okazaki, R., Tachibana, S., Sakamoto, K., Takano, Y., Okamoto, C., Yano, H., Miura, Y., Abe, M., Hasegawa, S., Noguchi, T. and Hayabusa2 sampler team
  • Journal Title: Space Science Reviews Volume: - Issue: 1-4 Pages: 1-26
  • DOI: 10.1007/s11214-017-0338-8
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] NIRS3: the near infrared spectrometer on Hayabusa2 (2017)
  • Author(s): Iwata, T., Kitazato, K., Abe, M., Ohtake, M., Arai, T., Arai, T., Hirata, N., Hiroi, T., Honda, C., Imae, N., Komatsu, M., Matsunaga, T., Matsuoka, M., Matsuura, S., Nakamura, T., Nakato, A., Nakauchi, Y., Osawa, T., Senshu, H., Takagi, Y., Tsumura, K., Takato, N., Watanabe, S., Barucci, M. A., Palomba, E., Ozaki, M.
  • Journal Title: Space Science Reviews Volume: 印刷中 Issue: 1-4 Pages: 317-337
  • DOI: 10.1007/s11214-017-0341-0
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Hayabusa2 sample container: Metal-seal system for vacuum encapsulation of returned samples. (2016)
  • Author(s): Okazaki, R., Sawada, H., Yamanouchi, S., Tachibana, S., Miura, Y., Sakamoto, K., Takano, Y., Abe, M., Itoh, S., Yamada, K., Yabuta, H., Okamoto, C., Yano, H., Noguchi, T., Nakamura, T. and Nagao, K.
  • Journal Title: Space Science Reviews Volume: - Issue: 1-4 Pages: 1-18
  • DOI: 10.1007/s11214-016-0289-5
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Presentation] GLOBAL VIEW OF THE MINERALOGY AND SURFACE PROPERTIES OF THE ASTEROID RYUGU USING NIRS3 NEAR-INFRARED SPECTROMETER ON BOARD HAYABUSA2. (2019)
  • Author(s): L. Riu, K. Kitazato, R. Milliken, T. Iwata, M. Abe et al.
  • Organizer: 50th Lunar and Planetary Science Conference
  • Int'l Joint Research
• [Presentation] HIGH POROSITY NATURE OF THE TOP-SHAPE C-TYPE ASTEROID 162173 RYUGU AS OBSERVED BY HAYABUSA2. (2019)
  • Author(s): S. Watanabe, M. Hirabayashi, M. Abe et al.
  • Organizer: 50th Lunar and Planetary Science Conference
  • Int'l Joint Research
• [Presentation] POSSIBLE INTERPRETATIONS OF VISIBLE/NEAR-INFRARED SPECTRA OF ASTEROID RYUGU OBTAINED BY THE HAYABUSA2 MISSION. (2019)
  • Author(s): T. Nakamura, M. Matsuoka, K. Amano, S. Kobayashi, H. Mita, R. Brunetto, C. Lantz, T. Hiroi, M. E. Zolensky, K. Kitazato, S. Sugita, R. Honda, T. Morota, E. Tatsumi, R. E. Milliken, T. Iwata, S. Kameda, H. Sawada, M. Abe et al.
  • Organizer: 50th Lunar and Planetary Science Conference
  • Int'l Joint Research
• [Presentation] GAUSSIAN DECONVOLUTION OF THE 2.7-MICRON BAND OF HAYABUSA2/NIRS3 SPECTRUM OF ASTEROID RYUGU; POSSIBLY A HEAVILY SPACE-WEATHERED CM CHONDRITE BODY. (2019)
  • Author(s): T. Hiroi, R. E. Milliken, K. M. Robertson, H. Kaiden, K. Misawa, H. Tanaka, S. Sasaki, M. Matsuoka, T. Nakamura, K. Kitazato, T. Iwata, M. Abe et al.
  • Organizer: 50th Lunar and Planetary Science Conference
  • Int'l Joint Research
• [Presentation] INFRARED SPECTRA OF ASTEROID RYUGU: COMPARISON TO LABORATORY-MEAS URED CARBONACEOUS CHONDRITES. (2019)
  • Author(s): M. Matsuoka, T. Nakamura, T. Hiroi, K. Kitazato, T. Iwata, M. Abe et al.
  • Organizer: 50th Lunar and Planetary Science Conference
  • Int'l Joint Research
• [Presentation] STATISTICAL ANALYSIS OF SPECTROPHOTOMETRY AND SPECTRAL VARIATION ON THE SURFACE OF (162173) RYUGU AS OBSERVED BY JAXA HAYABUSA2 MISSION. (2019)
  • Author(s): M.A. Barucci, R. Honda , Y. Yokota, S. Sugita, T. Morota, S. Kameda, E. Tatsumi, , K. Kitazato, T. Iwata, M. Abe et al.
  • Organizer: 50th Lunar and Planetary Science Conference
  • Int'l Joint Research
• [Presentation] H+ ION IRRADIATION EXPERIMENTS OF ENSTATITE: SPACE WEATHERING BY SOLAR WIND (2019)
  • Author(s): A. Takigawa, Y. Asada, Y. Nakauchi, T. Matsumoto, A. Tsuchiyama, M. Abe, N. Watanabe
  • Organizer: 82th Annual metting of Meteoritical Society
  • Int'l Joint Research
• [Presentation] Infrared spectra of asteroid 162173 Ryugu obtained by Near-infrared Spectrometer (NIRS3) (2018)
  • Author(s): Moe Matsuoka, Kohei Kitazato, Takahiro Iwata, Masanao Abe et al.
  • Organizer: Hayabusa 2018
  • Int'l Joint Research
• [Presentation] Hayabusa2 sample recovery and phase-1 curation (2018)
  • Author(s): M. Abe, T. Yada, K. Yogata, T. Okada, K. Sakamoto, M. Yoshitake, S. Furuya, M. Nishimura, K. Kumagai, and H. Yurimoto
  • Organizer: Hayabusa 2018
  • Int'l Joint Research
• [Presentation] Interpretation of infrared spectra of asteroid Ryugu based on comparison to carbonaceous chondrites and other meteorites (2018)
  • Author(s): Moe Matsuoka, Tomoki Nakamura, Takahiro Hiroi, Kohei Kitazato, Takahiro Iwata, Masanao Abe et al.
  • Organizer: AGU Fall Meeting 2018
  • Int'l Joint Research
• [Presentation] Hayabusa2/NIRS3 spectral observations of asteroid (162173) Ryugu (2018)
  • Author(s): Rosario Brunetto, Kohei Kitazato, Takahiro Iwata, Masanao Abe et al.
  • Organizer: AGU Fall Meeting 2018
  • Int'l Joint Research
• [Presentation] Spectral comparison between asteroid (162173) Ryugu and carbonaceous meteorites (2018)
  • Author(s): Moe Matsuoka, Tomoki Nakamura, Takahiro Hiroi, Kohei Kitazato, Takahiro Iwata, Masanao Abe et al.
  • Organizer: DPS meeting #50
  • Int'l Joint Research
• [Presentation] Surface composition of asteroid (162173) Ryugu from Hayabusa2/NIRS3 observations (2018)
  • Author(s): Kohei Kitazato, Takahiro Iwata, Masanao Abe et al.
  • Organizer: DPS meeting #50
  • Int'l Joint Research
• [Presentation] 小惑星イトカワのレゴリス粒子に見られる硫化鉄鉱物の宇宙風化組織 (2018)
  • Author(s): 松本 徹、Dennis Harries、仲内 悠祐、浅田 祐馬、瀧川 晶、土山 明、安部 正真、三宅 亮、中尾 聡、Falko Langenhorst
  • Organizer: 日本地球惑星科学連合2018年大会
  • Int'l Joint Research
• [Presentation] An experimental investigation of thermal stability of OH/H2o formed by solar wind implantation on lunar surface (2018)
  • Author(s): Y. Nakauchi, M. Abe, T. Matsumoto, K. Kitazato, A. Tsuchiyama
  • Organizer: 49th Lunar and Planetary Science Conference
  • Int'l Joint Research
• [Presentation] Near-infrared spectroscopy of Mars and Jupiter from the NIRS3 instrument on Hayabusa2 (2018)
  • Author(s): K. Kitazato, S. Nasu, T. Iwata, M. Abe, M. Ohtake, and Hayabusa2 NIRS3 Team
  • Organizer: 49th Lunar and Planetary Science Conference
  • Int'l Joint Research
• [Presentation] Curation Facility for asteroid sample return missions in Japan (2018)
  • Author(s): M. Abe, T. Yada, T. Okada, K. Sakamoto, M. Yoshitake, Y. Nakano, T. Matsumoto, N. Kawasaki, K. Kumagai, S. Matsui, M. Nishimura, H. Yurimoto
  • Organizer: 49th Lunar and Planetary Science Conference
  • Int'l Joint Research
• [Presentation] Thermally induced rock breakdown on asteroid Itokawa (2017)
  • Author(s): Kohei Kitazato; Naru Hirata; Hirohide Demura; Tomoki Inasawa; Masanao Abe; Yukio Yamamoto; Akira Miura; Jun'ichiro Kawaguchi
  • Organizer: 49th Annual Division for Planetary Science Meeting
  • Int'l Joint Research
• [Presentation] New equipment the ion beam irradiation equipment installed at ISAS / JAXA (2017)
  • Author(s): Yusuke Nakauchi; Toru Matsumoto; Yuma Asada; Masanao Abe; Akira Tsuchiyama; Aki Takigawa; Naoki Watanabe
  • Organizer: 49th Annual Division for Planetary Science Meeting
  • Int'l Joint Research
• [Presentation] はやぶさ2 近赤外分光計のクルージング観測と小惑星近傍観測計画 (2017)
  • Author(s): 北里宏平, 岩田隆浩, 安部正真, 大竹真紀子
  • Organizer: 日本地球惑星科学連合2017年大会
• [Presentation] Performance report of solar wind ion irradiation equipment (2017)
  • Author(s): 仲内 悠祐, 松本 徹, 安部 正真, 土山 明, 瀧川 晶, 渡部 直樹, 浅田 祐馬
  • Organizer: 日本地球惑星科学連合2017年大会
• [Presentation] 太陽風による宇宙風化を模擬した輝石・かんらん石への水素イオン照射実験 (2017)
  • Author(s): 浅田 祐馬, 土山 明, 瀧川 晶, 松本 徹, 仲内 悠祐, 安部 正真, 渡部 直樹
  • Organizer: 日本地球惑星科学連合2017年大会
• [Presentation] エンスタタイトへの1 keV水素イオン照射による太陽風宇宙風化模擬実験 (2017)
  • Author(s): 浅田 祐馬, 滝川 晶, 土山 晃, 松本 徹, 仲内 悠佑, 安部 正真, 渡部 直樹
  • Organizer: 日本惑星科学会 2017年秋季講演会
• [Presentation] 小惑星イトカワの表面に見られる白色地域の成因 (2017)
  • Author(s): 北里宏平, 平田成, 出村裕英, 稲澤朋生, 安部正真, 山本幸生, 三浦昭, 川口淳一郎
  • Organizer: 日本惑星科学会 2017年秋季講演会
• [Presentation] 珪酸塩鉱物中におけるOH/H2O の温度安定性の実験的検証 (2017)
  • Author(s): 仲内悠祐, 安部正真, 松本徹, 北里宏平, 土`山明
  • Organizer: 日本惑星科学会 2017年秋季講演会
• [Presentation] 層状ケイ酸塩鉱物における太陽風プロトンの影響 (2016)
  • Author(s): 仲内悠祐, 松本徹, 安部正真,他
  • Organizer: 日本惑星科学会秋期講演会
  • Place of Presentation: 岡山
  • Year and Date: 2016-09-12
• [Presentation] はやぶさ２近赤外線分光計を用いた地球・月観測 (2016)
  • Author(s): 北里宏平, 岩田隆浩, 安部正真, 他
  • Organizer: 第60回宇宙科学技術連合講演会
  • Place of Presentation: 函館
  • Year and Date: 2016-09-06
• [Presentation] Laboratory simulation of solar wind protonImplantation on hydrated silicate minerals. (2016)
  • Author(s): Nakauchi Y, Matsumoto T., Abe M., et al.
  • Organizer: Goldshmidt Workshop on Experimental Cosmochemisty
  • Place of Presentation: Yokohama
  • Int'l Joint Research