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Journal Articles

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*; et al.

Nature Astronomy (Internet), 5(3), p.246 - 250, 2021/03

 Times Cited Count:58 Percentile:96.23(Astronomy & Astrophysics)

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.

Journal Articles

Gapless spin liquid in a square-kagome lattice antiferromagnet

Fujihara, Masayoshi*; Morita, Katsuhiro*; Mole, R.*; Mitsuda, Setsuo*; Toyama, Takami*; Yano, Shinichiro*; Yu, D.*; Sota, Shigetoshi*; Kuwai, Tomohiko*; Koda, Akihiro*; et al.

Nature Communications (Internet), 11, p.3429_1 - 3429_7, 2020/07

 Times Cited Count:51 Percentile:92.31(Multidisciplinary Sciences)

Oral presentation

Space exposure experiments of microorganisms as a part of TANPOPO; Astrobiology exposure and micrometeoroid capture experiments

Yokobori, Shinichi*; Yang, Y.*; Fujisaki, Kenta*; Kawaguchi, Yuko*; Hashimoto, Hirofumi*; Yamashita, Masamichi*; Yano, Hajime*; Okudaira, Kyoko*; Yoshimura, Yoshitaka*; Narumi, Issei; et al.

no journal, , 

no abstracts in English

Oral presentation

TANPOPO (Astrobiology Exposure and Micrometeoroid Capture Experiments on ISS-JEM KIBO); Investigation of possible survivability of microorganisms in space

Yokobori, Shinichi*; Fujisaki, Kenta*; Kawaguchi, Yuko*; Yang, Y.*; Fushimi, Hidehiko*; Hashimoto, Hirofumi*; Yamashita, Masamichi*; Yano, Hajime*; Okudaira, Kyoko*; Hayashi, Nobuhiro*; et al.

no journal, , 

no abstracts in English

Oral presentation

Discussion on possibility of "Search of Life" mission on moon

Yokobori, Shinichi*; Haruyama, Junichi*; Yano, Hajime*; Narumi, Issei; Mita, Hajime*; Takahashi, Junichi*

no journal, , 

no abstracts in English

Oral presentation

Discussion on possibility of "Search of Life" mission on Moon

Yokobori, Shinichi*; Haruyama, Junichi*; Yano, Hajime*; Narumi, Issei; Mita, Hajime*; Takahashi, Junichi*

no journal, , 

no abstracts in English

Oral presentation

TANPOPO: astrobiology exposure and micrometeoroid capture experiments; For understanding survival possibility of trans-space migration of microorganisms

Yokobori, Shinichi*; Yang, Y.*; Fujisaki, Kenta*; Kawaguchi, Yuko*; Kobayashi, Kensei*; Hashimoto, Hirofumi*; Kawai, Hideyuki*; Mita, Hajime*; Narumi, Issei; Okudaira, Kyoko*; et al.

no journal, , 

no abstracts in English

Oral presentation

Survivality of Deinococci under space conditions ?; Toward the space exposure experiment in "TANPOPO" mission at ISS

Murano, Yuka*; Harada, Miyu*; Kawaguchi, Yuko*; Hashimoto, Hirofumi*; Kobayashi, Kensei*; Nakagawa, Kazumichi*; Narumi, Issey*; Sato, Katsuya; Yoshida, Satoshi*; Yano, Hajime*; et al.

no journal, , 

Oral presentation

Preliminary analyses of groundwater flow simulation for evaluation of meteoric water infiltration as a test case of Horonobe area

Matsuoka, Toshiyuki; Miyakawa, Kazuya; Hayano, Akira; Nakayasu, Akio*; Sasamoto, Hiroshi; Masuoka, Kentaro*; Yamamoto, Hajime*

no journal, , 

JAEA have been developing the investigation and the evaluation methods for understanding the spatial distribution of hydrogeological and geochemical condition and their long-term stabilities. This paper summarized the preliminary analyses of groundwater flow simulation focused on the meteoric water infiltration as a test case of Horonobe area.

Oral presentation

Structural analysis of soft interface film by X-ray reflection and total reflection XAFS method

Yano, Yoko*; Tanida, Hajime

no journal, , 

This study group made use of X-ray reflection (XR), grazing-incident X-ray diffraction (GIXD), and X-ray absorption fine structure (XAFS) methods using the high-brilliance synchrotron radiation of SPring-8 to study a soft interface and a soft interface firm in situ.

Oral presentation

Current status of preparation of TANPOPO mission (astrobiology exposure and micrometeoroid capture experiments) and investigation of survivability of microbes in space

Yokobori, Shinichi*; Kawaguchi, Yuko*; Shimizu, Yasuyuki*; Kawashiri, Narutoshi*; Shiraishi, Keisuke*; Sugino, Tomohiro*; Takahashi, Yuta*; Yang, Y.*; Tanigawa, Yoshiaki*; Hashimoto, Hirofumi*; et al.

no journal, , 

no abstracts in English

Oral presentation

Tanpopo: astrobiology exposure and micrometeoroid-capture experiments; On the capture and space exposure experiments

Yokobori, Shinichi*; Yang, Y.*; Kawaguchi, Yuko*; Sugino, Tomohiro*; Takahashi, Yuta*; Narumi, Issei; Takahashi, Yuichi*; Hayashi, Nobuhiro*; Yoshimura, Yoshitaka*; Tabata, Makoto*; et al.

no journal, , 

no abstracts in English

Oral presentation

The Microbe capture experiment in space; Fluorescence microscopic detection of microbes captured by aerogel

Sugino, Tomohiro*; Yokobori, Shinichi*; Yang, Y.*; Kawaguchi, Yuko*; Hasegawa, Sunao*; Hashimoto, Hirofumi*; Imai, Eiichi*; Okudaira, Kyoko*; Kawai, Hideyuki*; Tabata, Makoto*; et al.

no journal, , 

Oral presentation

Microbe space exposure experiments at International Space Station (ISS) in the mission "Tanpopo"

Yokobori, Shinichi*; Yang, Y.*; Sugino, Tomohiro*; Kawaguchi, Yuko*; Takahashi, Yuta*; Narumi, Issei; Hashimoto, Hirofumi*; Hayashi, Nobuhiro*; Imai, Eiichi*; Kawai, Hideyuki*; et al.

no journal, , 

Oral presentation

Microbes capture and expose experiments on ISS proposed in Tanpopo mission

Kawaguchi, Yuko*; Sugino, Tomohiro*; Yang, Y.*; Takahashi, Yuta*; Yoshimura, Yoshitaka*; Tsuji, Takashi*; Kobayashi, Kensei*; Tabata, Makoto*; Hashimoto, Hirofumi*; Narumi, Issei; et al.

no journal, , 

no abstracts in English

Oral presentation

Tanpopo project; Survival of microbes in outer space

Yokobori, Shinichi*; Kawaguchi, Yuko*; Yang, Y.*; Kawashiri, Narutoshi*; Shiraishi, Keisuke*; Shimizu, Yasuyuki*; Takahashi, Yuta*; Sugino, Tomohiro*; Narumi, Issei; Sato, Katsuya; et al.

no journal, , 

no abstracts in English

Oral presentation

Current status of preparation of TANPOPO mission (astrobiology exposure and micrometeoroid capture experiments) and investigation of survivability of microbes in space

Yokobori, Shinichi*; Kawaguchi, Yuko*; Yang, Y.*; Kawashiri, Narutoshi*; Shiraishi, Keisuke*; Shimizu, Yasuyuki*; Takahashi, Yuta*; Sugino, Tomohiro*; Narumi, Issei; Sato, Katsuya; et al.

no journal, , 

no abstracts in English

Oral presentation

Tanpopo Working Group report; Space exposure of microbes and organic materials

Yokobori, Shinichi*; Kobayashi, Kensei*; Mita, Hajime*; Yabuta, Hikaru*; Nakagawa, Kazumichi*; Narumi, Issei; Hayashi, Nobuhiro*; Tomita, Kaori*; Kawaguchi, Yuko*; Shimizu, Yasuyuki*; et al.

no journal, , 

no abstracts in English

Oral presentation

Capture and space exposure experiments of microorganisms on the ISS orbit proposed in "TANPOPO" mission

Yokobori, Shinichi*; Yang, Y.*; Kawaguchi, Yuko*; Sugino, Tomohiro*; Takahashi, Yuta*; Narumi, Issei; Nakagawa, Kazumichi*; Tabata, Makoto*; Kobayashi, Kensei*; Marumo, Katsumi*; et al.

no journal, , 

Oral presentation

Quest for microorganisms existing at high atmosphere and space

Yokobori, Shinichi*; Yang, Y.*; Sugino, Tomohiro*; Kawaguchi, Yuko*; Itahashi, Shiho*; Fujisaki, Kenta*; Fushimi, Hidehiko*; Hasegawa, Sunao*; Hashimoto, Hirofumi*; Hayashi, Nobuhiro*; et al.

no journal, , 

24 (Records 1-20 displayed on this page)