Refine your search�ソスF     
Report No.
 - 

Thermally altered subsurface material of asteroid (162173) Ryugu

Kitazato, Kohei*; Milliken, R. E.*; Iwata, Takahiro*; Abe, Masanao*; Otake, Makiko*; Matsuura, Shuji*; Takagi, Yasuhiko*; Nakamura, Tomoki*; Hiroi, Takahiro*; Matsuoka, Moe*; Riu, L.*; Nakauchi, Yusuke*; Tsumura, Koji*; Arai, Takehiko*; Senshu, Hiroki*; Hirata, Naru*; Barucci, M. A.*; Brunetto, R.*; Pilorget, C.*; Poulet, F.*; Bibring, J.-P.*; Domingue, D. L.*; Vilas, F.*; Takir, D.*; Palomba, E.*; Galiano, A.*; Perna, D.*; Osawa, Takahito  ; Komatsu, Mutsumi*; Nakato, Aiko*; Arai, Tomoko*; Takato, Naruhisa*; Matsunaga, Tsuneo*; Arakawa, Masahiko*; Saiki, Takanao*; Wada, Koji*; Kadono, Toshihiko*; Imamura, Hiroshi*; Yano, Hajime*; Shirai, Kei*; Hayakawa, Masahiko*; Okamoto, Chisato*; Sawada, Hirotaka*; Ogawa, Kazunori*; Iijima, Yuichi*; Sugita, Seiji*; Honda, Rie*; Morota, Tomokatsu*; Kameda, Shingo*; Tatsumi, Eri*; Cho, Yuichiro*; Yoshioka, Kazuo*; Yokota, Yasuhiro*; Sakatani, Naoya*; Yamada, Manabu*; Koyama, Toru*; Suzuki, Hidehiko*; Honda, Chikatoshi*; Namiki, Noriyuki*; Mizuno, Takahide*; Matsumoto, Koji*; Noda, Hirotomo*; Ishihara, Yoshiaki*; Yamada, Ryuhei*; Yamamoto, Keiko*; Yoshida, Fumi*; Abe, Shinsuke*; Higuchi, Arika*; Yamamoto, Yukio*; Okada, Tatsuaki*; Shimaki, Yuri*; Noguchi, Rina*; Miura, Akira*; Hirata, Naoyuki*; Tachibana, Shogo*; Yabuta, Hikaru*; Ishiguro, Masaaki*; Ikeda, Hirokazu*; Takeuchi, Hiroshi*; Shimada, Toru*; Mori, Osamu*; Hosoda, Satoshi*; Tsukizaki, Ryudo*; Soldini, S.*; Ozaki, Masanobu*; Terui, Fuyuto*; Ogawa, Naoko*; Mimasu, Yuya*; Ono, Go*; Yoshikawa, Kento*; Hirose, Chikako*; Fujii, Atsushi*; Takahashi, Tadateru*; Kikuchi, Shota*; Takei, Yuto*; Yamaguchi, Tomohiro*; Nakazawa, Satoru*; Tanaka, Satoshi*; Yoshikawa, Makoto*; Watanabe, Seiichiro*; Tsuda, Yuichi*

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. However, the strength and shape of the OH feature still suggests that the subsurface material experienced heating above 300 $$^{circ}$$C, similar to the surface. In contrast, thermophysical modeling indicates that radiative heating does not increase the temperature above 200 $$^{circ}$$C at the estimated excavation depth of 1 m, even if the semimajor axis is reduced to 0.344 au. This supports the hypothesis that primary thermal alteration occurred due to radiogenic and/or impact heating on Ryugu's parent body.

Accesses

:

- Accesses

InCites™

:

Percentile:96.87

Category:Astronomy & Astrophysics

Altmetrics

:

[CLARIVATE ANALYTICS], [WEB OF SCIENCE], [HIGHLY CITED PAPER & CUP LOGO] and [HOT PAPER & FIRE LOGO] are trademarks of Clarivate Analytics, and/or its affiliated company or companies, and used herein by permission and/or license.