Thermally altered subsurface material of asteroid (162173) Ryugu View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2021-01-04

AUTHORS

K. Kitazato, R. E. Milliken, T. Iwata, M. Abe, M. Ohtake, S. Matsuura, Y. Takagi, T. Nakamura, T. Hiroi, M. Matsuoka, L. Riu, Y. Nakauchi, K. Tsumura, T. Arai, H. Senshu, N. Hirata, M. A. Barucci, R. Brunetto, C. Pilorget, F. Poulet, J.-P. Bibring, D. L. Domingue, F. Vilas, D. Takir, E. Palomba, A. Galiano, D. Perna, T. Osawa, M. Komatsu, A. Nakato, T. Arai, N. Takato, T. Matsunaga, M. Arakawa, T. Saiki, K. Wada, T. Kadono, H. Imamura, H. Yano, K. Shirai, M. Hayakawa, C. Okamoto, H. Sawada, K. Ogawa, Y. Iijima, S. Sugita, R. Honda, T. Morota, S. Kameda, E. Tatsumi, Y. Cho, K. Yoshioka, Y. Yokota, N. Sakatani, M. Yamada, T. Kouyama, H. Suzuki, C. Honda, N. Namiki, T. Mizuno, K. Matsumoto, H. Noda, Y. Ishihara, R. Yamada, K. Yamamoto, F. Yoshida, S. Abe, A. Higuchi, Y. Yamamoto, T. Okada, Y. Shimaki, R. Noguchi, A. Miura, N. Hirata, S. Tachibana, H. Yabuta, M. Ishiguro, H. Ikeda, H. Takeuchi, T. Shimada, O. Mori, S. Hosoda, R. Tsukizaki, S. Soldini, M. Ozaki, F. Terui, N. Ogawa, Y. Mimasu, G. Ono, K. Yoshikawa, C. Hirose, A. Fujii, T. Takahashi, S. Kikuchi, Y. Takei, T. Yamaguchi, S. Nakazawa, S. Tanaka, M. Yoshikawa, S. Watanabe, Y. Tsuda

ABSTRACT

Analyses of meteorites and theoretical models indicate that some carbonaceous near-Earth asteroids may have been thermally altered due to radiative heating during close approaches to the Sun1–3. However, the lack of direct measurements on the subsurface doesn’t allow us to distinguish thermal alteration due to radiative heating from parent-body processes. In April 2019, the Hayabusa2 mission successfully completed an artificial impact experiment on the carbonaceous near-Earth asteroid (162173) Ryugu4,5, which provided an opportunity to investigate exposed subsurface material and test potential effects of radiative heating. Here we report observations of Ryugu’s subsurface material by the Near-Infrared Spectrometer (NIRS3) on the Hayabusa2 spacecraft. Reflectance spectra of excavated material exhibit a hydroxyl (OH) absorption feature that is slightly stronger and peak-shifted compared with that observed for the surface, indicating that space weathering and/or radiative heating have caused subtle spectral changes in the uppermost surface. The strength and shape of the OH feature suggests that the subsurface material experienced heating above 300 °C, similar to the surface. In contrast, thermophysical modelling indicates that radiative heating cannot increase the temperature above 200 °C at the estimated excavation depth of 1 m, even at the smallest heliocentric distance possible for Ryugu. This supports the hypothesis that primary thermal alteration occurred on Ryugu’s parent body. More... »

PAGES

246-250

Journal

TITLE

Nature Astronomy

ISSUE

3

VOLUME

5

Author Affiliations

  • The University of Aizu, Fukushima, Japan
  • Brown University, Providence, RI, USA
  • The Graduate University for Advanced Studies (SOKENDAI), Kanagawa, Japan
  • Kwansei Gakuin University, Hyogo, Japan
  • Aichi Toho University, Nagoya, Japan
  • Tohoku University, Sendai, Japan
  • Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA), Sagamihara, Japan
  • Tokyo City University, Tokyo, Japan
  • Ashikaga University, Tochigi, Japan
  • Chiba Institute of Technology, Chiba, Japan
  • LESIA, Observatoire de Paris, Université PSL, CNRS, Université de Paris, Sorbonne Université, Meudon, France
  • Institut d’Astrophysique Spatial, Université Paris-Sud, Orsay, France
  • Planetary Science Institute, Tucson, AZ, USA
  • Astromaterials Research and Exploration Science, NASA Johnson Space Center, Houston, TX, USA
  • Istituto di Astrofisica e Planetologia Spaziali, Istituto Nazionale di Astrofisica (INAF), Rome, Italy
  • Osservatorio Astronomico di Roma, INAF, Monte Porzio Catone, Italy
  • Japan Atomic Energy Agency, Ibaraki, Japan
  • National Astronomical Observatory of Japan, Tokyo, Japan
  • National Institute for Environmental Studies, Ibaraki, Japan
  • Kobe University, Kobe, Japan
  • University of Occupational and Environmental Health, Kitakyushu, Japan
  • JAXA Space Exploration Center, JAXA, Sagamihara, Japan
  • The University of Tokyo, Tokyo, Japan
  • Kochi University, Kochi, Japan
  • Rikkyo University, Tokyo, Japan
  • Instituto de Astrofísica de Canarias, University of La Laguna, Tenerife, Spain
  • National Institute of Advanced Industrial Science and Technology, Tokyo, Japan
  • Meiji University, Tokyo, Japan
  • Nihon University, Chiba, Japan
  • Hiroshima University, Hiroshima, Japan
  • Seoul National University, Seoul, Korea
  • University of Liverpool, Liverpool, UK
  • Research and Development Directorate, JAXA, Sagamihara, Japan
  • NEC Corporation, Tokyo, Japan
  • Mitsubishi Electric Corporation, Kanagawa, Japan
  • Nagoya University, Nagoya, Japan
  • Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1038/s41550-020-01271-2

    DOI

    http://dx.doi.org/10.1038/s41550-020-01271-2

    DIMENSIONS

    https://app.dimensions.ai/details/publication/pub.1134295738


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