Rapid space weathering process on ryugu inferred from the artificial crater

E. Tatsumi1,2,3, M. Matsuoka4, S. Sugita3, K. Yumoto3, N. Takaki3, Y. Cho3, R. Honda5, M. Yamada6, T. Morota3, N. Sakatani7, S. Kameda7, T. Kouyama8, Y. Yokota4,5, C. Honda9, M. Hayakawa4, H. Suzuki10, K. Yoshioka3, H. Sawada4, K. Ogawa4,11, N. Hirata9, N. Hirata11, T. Saiki4, H. Imamura4, Y. Takagi12, H. Yano4, K. Shirai11, C. Okamoto†, Y. Tsuda4, S. Nakazawa4, Y. Iijima†, K. Kitazato9, T. Kadono13, K. Wada5, M. Arakawa11, M. Hirabayashi14, S. Watanabe15, 1Instituto de Astrofisica de Canarias, Tenerife, Spain (etatsumi@iac.es), 2Dept. of Astrophysics, Univ. of La Laguna, Tenerife, Spain, 3Univ. of Tokyo, Tokyo, Japan, 4Japan Aerospace Exploration Agency, Kanagawa, Japan, 5Kochi Univ., Kochi, Japan, 6Planetary Exploration Research Center, Chiba Inst. of Tech., 7Rikkyo Univ., Tokyo, Japan, 8National Inst. of Adv. Ind. Sci. and Tech., Ibaragi, Japan, 9Univ. of Aizu, Fukushima, Japan, 10Meiji Univ., Kanagawa Japan, 11Kobe Univ., Hyogo, Japan, 12Aichi Toho University, Aichi, Japan, 13 Univ. of Occupational and Environmental Health, Kitakyusyu, Japan, 14Aubum Univ., Alabama, USA. 15Nagoya Univ., Aichi, Japan, †Deceased