太陽系科学研究系

巽 瑛理

タツミ エリ  (Eri Tatsumi)

基本情報

所属
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 特任助教

研究者番号
60623197
ORCID ID
 https://orcid.org/0000-0002-6142-9842
J-GLOBAL ID
202001018349417556
researchmap会員ID
R000003532

研究キーワード

 3

委員歴

 3

論文

 90
  • K. Yumoto, E. Tatsumi, T. Kouyama, D. R. Golish, Y. Cho, T. Morota, S. Kameda, H. Sato, B. Rizk, D. N. DellaGiustina, Y. Yokota, H. Suzuki, J. de León, H. Campins, J. Licandro, M. Popescu, J. L. Rizos, R. Honda, M. Yamada, N. Sakatani, C. Honda, M. Matsuoka, M. Hayakawa, H. Sawada, K. Ogawa, Y. Yamamoto, D. S. Lauretta, S. Sugita
    Icarus 420 2024年9月15日  
    Various natural effects gradually alter the surfaces of asteroids exposed to the space environment. These processes are collectively known as space weathering. The influence of space weathering on the observed spectra of C-complex asteroids remains uncertain. This has long hindered our understanding of their composition and evolution through ground-based telescope observations. Proximity observations of (162173) Ryugu by the telescopic Optical Navigation Camera (ONC-T) onboard Hayabusa2 and that of (101955) Bennu by MapCam onboard Origins, Spectral Interpretation, Resource Identification, and Security-Regolith Explorer (OSIRIS-REx) found opposite spectral trends of space weathering; Ryugu darkened and reddened while Bennu brightened and blued. How the spectra of Ryugu and Bennu evolved relative to each other would place an important constraint for understanding their mutual relationship and differences in their origins and evolutions. In this study, we compared the space weathering trends on Ryugu and Bennu by applying the results of cross calibration between ONC-T and MapCam obtained in our companion paper. We show that the average Bennu surface is brighter by 18.0 ± 1.5% at v band (550 nm) and bluer by 0.18 ± 0.03 μm−1 (in the 480–850 nm spectral slope) than Ryugu. The spectral slopes of surface materials are more uniform on Bennu than on Ryugu at spatial scales larger than ∼1 m, but Bennu is more heterogeneous at scales below ∼1 m. This suggests that lateral mixing of surface materials due to resurfacing processes may have been more efficient on Bennu. The reflectance−spectral slope distributions of craters on Ryugu and Bennu appeared to follow two parallel trend lines with an offset before cross calibration, but they converged to a single straight trend without a bend after cross calibration. We show that the spectra of the freshest craters on Ryugu and Bennu are indistinguishable within the uncertainty of cross calibration. These results suggest that Ryugu and Bennu initially had similar spectra before space weathering and that they evolved in completely opposite directions along the same trend line, subsequently evolving into asteroids with different disk-averaged spectra. These findings further suggest that space weathering likely expanded the spectral slope variation of C-complex asteroids, implying that they may have formed from materials with more uniform spectral slopes.
  • K. Yumoto, E. Tatsumi, T. Kouyama, D.R. Golish, Y. Cho, T. Morota, S. Kameda, H. Sato, B. Rizk, D.N. DellaGiustina, Y. Yokota, H. Suzuki, J. de León, H. Campins, J. Licandro, M. Popescu, J.L. Rizos, R. Honda, M. Yamada, N. Sakatani, C. Honda, M. Matsuoka, M. Hayakawa, H. Sawada, K. Ogawa, Y. Yamamoto, D.S. Lauretta, S. Sugita
    Icarus 417 116122-116122 2024年7月  
  • Fernando Tinaut-Ruano, Julia de Leon, Eri Tatsumi, Batiste Rousseau, Juan Luis Rizos
    2024年5月2日  
  • Ronald-Louis Ballouz, Patrick Michel, Olivier Barnouin, Kevin Walsh, Martin Jutzi, Eri Tatsumi, Maria Antonella Barucci, Daniella DellaGiustina, Humberto Campins, Seiji Sugita, Seiichiro Watanabe, Hirdy Miyamoto, William Bottke, Harold Connolly, Makoto Yoshikawa, Dante Lauretta
    2024年5月2日  
  • Humberto Campins, Eri Tatsumi, Marcel Popescu, Juan Rizos, Amy Simon, Hannah Kaplan, Julia deLeon, Javier Licandro, Daniella DellaGiustina, Dante Lauretta
    2024年5月2日  

MISC

 9
  • B. E. Clark, A. Sen, X. D. Zou, D. N. DellaGiustina, S. Sugita, N. Sakatani, M. Thompson, D. Trang, E. Tatsumi, M. A. Barucci, M. Barker, H. Campins, T. Morota, C. Lantz, A. R. Hendrix, F. Vilas, L. Keller, V. E. Hamilton, K. Kitazato, S. Sasaki, M. Matsuoka, T. Nakamura, A. Praet, S. M. Ferrone, T. Hiroi, H. H. Kaplan, W. F. Bottke, J. Y. Li, L. Le Corre, J. L. Molaro, R. L. Ballouz, C. W. Hergenrother, B. Rizk, K. N. Burke, C. A. Bennett, D. R. Golish, E. S. Howell, K. Becker, A. J. Ryan, J. P. Emery, S. Fornasier, A. A. Simon, D. C. Reuter, L. F. Lim, G. Poggiali, P. Michel, M. Delbo, O. S. Barnouin, E. R. Jawin, M. Pajola, L. Riu, T. Okada, J. D.P. Deshapriya, J. R. Brucato, R. P. Binzel, D. S. Lauretta
    Icarus 400 2023年8月  
    This paper summarizes the evidence for the optical effects of space weathering, as well as the properties of the surface that control optical changes, on asteroid (101955) Bennu. First, we set the stage by briefly reviewing what was known about space weathering of low-albedo materials from telescopic surveys, laboratory simulations, and sample return analysis. We then look at the evidence for the nature of space weathering on Bennu from recent spacecraft imaging and spectroscopy observations, including the visible to near-infrared and thermal infrared wavelengths, followed by other measurements such as normal albedo measurements from LIDAR scans. We synthesize these different lines of evidence in an effort to describe a general model of space weathering processes and resulting color effects on dark C-complex asteroids, with hypotheses that can be tested by analyzing samples returned by the mission. A working hypothesis that synthesizes findings thus far is that the optical effects of maturation in the space environment depend on the level of hydration of the silicate/phyllosilicate substrate. Subsequent variations in color depend on surface processes and exposure age. On strongly hydrated Bennu, in color imaging data, very young craters are darker and redder than their surroundings (more positive spectral slope in the wavelength range 0.4–0.7μm) as a result of their smaller particle sizes and/or fresh exposures of organics by impacts. Solar wind, dehydration, or migration of fines may cause intermediate-age surfaces to appear bluer than the very young craters. Exposed surfaces evolve toward Bennu's moderately blue global average spectral slope. However, in spectroscopic and LIDAR data, the equator, the oldest surface on Bennu, is darker and redder (wavelength range 0.55–2.0μm) than average and has shallower absorption bands, possibly due to dehydration and/or nanophase and/or microphase opaque production. Bennu is a rubble pile with an active surface, making age relationships, which are critical for determining space weathering signals, difficult to locate and quantify. Hence, the full story ultimately awaits analyses of the Bennu samples that will soon be delivered to Earth.
  • 深井稜汰, 黒川宏之, 嶌生有理, 坂谷尚哉, 癸生川陽子, 青木順, 巽瑛理, 脇田茂, 牛久保孝行, 熊本篤志, 宮本英昭, 川村太一, 田中智, 辻健, 浦川聖太郎, 大澤亮, 津田雄一, 森治, 丸祐介, 佐伯孝尚, 岡田達明
    宇宙科学技術連合講演会講演集(CD-ROM) 67th 2023年  
  • 嶌生有理, 坂谷尚哉, 深井稜汰, 兵頭龍樹, 巽瑛理, 脇田茂, 浦川聖太郎, 末次竜, 岡田達明, 田中智, 渡邊誠一郎, 森治, 佐伯孝尚, 津田雄一
    日本惑星科学会秋季講演会予稿集(Web) 2022 2022年  
  • 金丸仁明, 佐々木晶, 諸田智克, 長勇一郎, 巽瑛理, 平田成, 千秋博紀, 嶌生有理, 坂谷尚哉, 田中智, 平林正俊, 岡田達明, 臼井寛裕, 杉田精司, 渡邊誠一郎
    日本惑星科学会秋季講演会予稿集(Web) 2020 2020年  
  • 渡邊誠一郎, 渡邊誠一郎, 平林正俊, 平田成, 平田直之, 野口里奈, 嶌生有理, 池田人, 巽瑛理, 吉川真, 菊地翔太, 薮田ひかる, 中村智樹, 橘省吾, 橘省吾, 石原吉明, 諸田智克, 北里宏平, 坂谷尚哉, 松本晃治, 松本晃治, 和田浩二, 千秋博紀, 本田親寿, 道上達広, 竹内央, 神山徹, 本田理恵, GASKELL Robert, PALMER Eric, BARNOUIN Olivier S., MICHEL Patrick, ABELL Paul, 山本幸生, 田中智, 白井慶, 松岡萌, 杉田精司, 杉田精司, 岡田達明, 並木則行, 荒川政彦, 石黒正晃, 小川和律, 照井冬人, 佐伯孝尚, 中澤暁, 津田雄一
    日本地球惑星科学連合大会予稿集(Web) 2019 2019年  

所属学協会

 2

共同研究・競争的資金等の研究課題

 7