宇宙物質科学・宇宙雪氷学グループ
English

　

Yasuhiro OBA

Career

　

2007 Ph.D at Okayama University
"Stable carbon and hydrogen isotopic compositions of organic matter in carbonaceous meteorites and its implication to alteration processes"

2007.4-2008.3　
Post-doctral scholar at University of Nevada-Reno (USA)
"Oxygen isotope fractionation of dissolved O2 by abiotic reduction"

2008.4-2009.3　
Post-doctral researcher at Institute of Low Temperature Science, Hokkaido Univerisity (JAPAN)
"Laboratory studies on the chemical evolution of interstellar molecules on a low-temperature solid surface"

2009.4-2012.3　
JSPS Post-doctral Fellow (PD) at Institute of Low Temperature Science, Hokkaido University
"Formation of amino acids by atomic surface reactions on interstellar grains at low temperatures"

2012.4-2015.3　
Specially-appointed assistant professor at Institute of Low Temperature Science, Hokkaido University
"Laboratory studies on chemical evolution in molecular clouds"

2015.4-2020.11
Assistant professor at Institute of Low Temperature Science, Hokkaido University
"Laboratory studies on chemical evolution from molecular clouds to planetary systems"

2020.12-present
Associate professor at Institute of Low Temperature Science, Hokkaido University
"Laboratory studies on chemical evolution from molecular clouds to planetary systems and beyond"

Publications

    Refereed Journals

    2024

  1. "Proposed inportance of HOCO chemistry: Inefficient formation of CO2 from CO and OH reactions on ice dust"
    A. Ishibashi, G. Molpeceres, H. Hidaka, Y. Oba, T. Lamberts, N. Watanabe
    Astrophysical Journal, 976, 162.

  2. "Chemical pathways of SO2 with hydrogen atoms on interstellar ice analogues"
    T. Nguyen, Y. Oba, W. M. C. Sameera, K. Furuya, N. Watanabe
    Astrophysical Journal, 976, 250.

  3. "FAUST XVIII: Super deuteration in the planet forming system IRS63 where the streamer strikes the disk"
    L. Podio, C. Ceccarelli, C. Codella, G. Sabatini, D. Segura-Cox, N. Balucani, A. Rimola, P. Ugliengo, C. J. Chandler, N. Sakai, B. Svoboda, J. Pineda, M. De Simone, E. Bianchi, P. Caselli, A. Isella, Y. Aikawa, M. Bouvier, E. Caux, L. Chahine, S. B. Charnley, N. Cuello, F. Dulieu, L. Evans, D. Fedele, S. Feng, F. Fontani, T. Hama, T. Hanawa, E. Herbst, T. Hirota, I. Jimenez-Serra, D. Johnstone, B. Lefloch, R. Le Gal, L. Loinard, H. Baobab Liu, A. Lopez-Sepulcre, L. T. Maud, M. J. Maureira, F. Menard, A. Miotello, G. Moellenbrock, H. Nomura, Y. Oba, S. Ohashi, Y. Okoda, Y. Oya, T. Sakai, Y. Shirley, L. Testi, C. Vastel, S. Viti, N. Watanabe, Y. Watanabe, Y. Zhang, Z. E. Zhang, and S. Yamamoto
    Astronomy & Astrophyscs, 688, L22 (2024)

  4. "Primordial aqueous alteration recorded in water-soluble organic molecules from the carbonaceous asteroid (162173) Ryugu"
    Y. Takano, H. Naraoka, J. P. Dworkin, T. Koga, K. Sasaki, H. Sato, Y. Oba, N. O. Ogawa, T. Yoshimura, K. Hamase, N. Ohkouchi, E. T. Parker, J. C. Aponte, D. P. Glavin, Y. Furukawa, J. Aoki, K. Kano, S.-i. M. Nomura, F.-R. Orthous-Daunay, P. Schmitt-Kopplin, H. Yurimoto, T. Nakamura, T. Noguchi, R. Okazaki, H. Yabuta, K. Sakamoto, T. Yada, M. Nishimura, A. Nakato, A. Miyazaki, K. Yogata, M. Abe, T. Okada, T. Usui, M. Yoshikawa, T. Saiki, S. Tanaka, F. Terui, S. Nakazawa, S-i. Watanabe, Y. Tsuda, S. Tachibana
    Nature Communications, 15, 5706 (2024).

  5. "Multiple chemical tracers finally unveil the intricate NGC 1333 IRAS 4A outflow system. FAUST XVI"
    Layal Chahine, Cecilia Ceccarelli, Marta De Simone, Claire J Chandler, Claudio Codella, Linda Podio, Ana Lopez-Sepulcre, Nami Sakai, Laurent Loinard, Mathilde Bouvier, Paola Caselli, Charlotte Vastel, Eleonora Bianchi, Nicolas Cuello, Francesco Fontani, Doug Johnstone, Giovanni Sabatini, Tomoyuki Hanawa, Ziwei E Zhang, Yuri Aikawa, Gemma Busquet, Emmanuel Caux, Aurore Duran, Eric Herbst, Francois Menard, Dominique Segura-Cox, Brian Svoboda, Nadia Balucani, Steven Charnley, Francois Dulieu, Lucy Evans, Davide Fedele, Siyi Feng, Tetsuya Hama, Tomoya Hirota, Andrea Isella, Izaskun Jimenez-Serra, Bertrand Lefloch, Luke T Maud, Maria Jose Maureira, Anna Miotello, George Moellenbrock, Hideko Nomura, Yasuhiro Oba, Satoshi Ohashi, Yuki Okoda, Yoko Oya, Jaime Pineda, Albert Rimola, Takeshi Sakai, Yancy Shirley, Leonardo Testi, Serena Viti, Naoki Watanabe, Yoshimasa Watanabe, Yichen Zhang, Satoshi Yamamoto
    Monthely Notices of the Royal Astronomical Society, 531, 2653-2668 (2024).

  6. "Investigating the impact of X-ray computed tomography imaging on soluble organic matter in the Murchison meteorite: Implications for Bennu sample analysis"
    D. P. Glavin, S. A. Eckley, J. C. Aponte, E. L. Berger, A. S. Burton, J. P. Dworkin, J. E. Elsila, F. T. Ferguson, Y. Furukawa, H. V. Graham, T. Koga, M. Liss, H. L. McLain, H. Naraoka, Y. Oba, E. T. Parker, K. Righter, P. Schmitt-Kopplin, D. N. Simkus, Y. Takano, H. C. Connolly Jr., D. S. Lauretta
    Meteoritics and Planetary Science, 59, 105-133 (2024).

  7. "Abundant extraterrestrial purine nucleobases in the Murchison meteorite: Implications for a unified mechanism for purine synthesis in carbonaceous chondrite parent bodies"
    T. Koga, Y. Takano, N. O. Ogawa, Y. Oba, H. Naraoka, N. Ohkouchi
    Geochimica et Cosmochimica Acta, 365, 253-265 (2024).

  8. "Enantioselective three-dimensional high-performance liquid chromatographic determination of amino acids in the Hayabusa2 returned samples from the asteroid Ryugu"
    Aogu Furusho, Chiharu Ishii, Takeyuki Akita, Mai Oyaide, Masashi Mita, Hiroshi Naraoka, Yoshinori Takano, Jason P. Dworkin, Yasuhiro Oba, Toshiki Koga, Kazuhiko Fukushima, Dan Aoki, Minako Hashiguchi, Hajime Mita, Yoshito Chikaraishi, Naohiko Ohkouchi, Nanako O. Ogawa, Saburo Sakai, Daniel P. Glavin, Jamie E. Elsila, Eric T. Parker, Jose C. Aponte, Hannah L. McLain, Francois-Regis Orthous-Daunay, Veronique Vuitton, Roland Thissen, Cedric Wolters, Philippe Schmitt-Kopplin, Alexander Ruf, Junko Isa, Norbert Hertkorn, John M. Eiler, Toshihiro Yoshimura, Haruna Sugahara, Heather V. Graham, Yoshihiro Furukawa, Daisuke Araoka, Satoru Tanaka, Takaaki Yoshikawa, Fumie Kabashima, Kazunori Sasaki, Hajime Sato, Tomoya Yamazaki, Morihiko Onose, Mayu Morita, Yuki Kimura, Kuniyuki Kano, Junken Aoki, Kosuke Fujishima, Shin-ichiro Nomura, Shogo Tachibana, Tomoki Nakamura, Takaaki Noguchi, Ryuji Okazaki, Hikaru Yabuta, Hisayoshi Yurimoto, Kanako Sakamoto, Toru Yada, Masahiro Nishimura, Aiko Nakato, Akiko Miyazaki, Kasumi Yogata, Masanao Abe, Tomohiro Usui, Makoto Yoshikawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Satoru Nakazawa, Tatsuaki Okada, Sei-ichiro Watanabe, Yuichi Tsuda, and Kenji Hamase
    Journal of Chromatography Open, 5, 100134 ("024).

  9. "FAUST-XIII. Dusty cavity and molecular shock driven by IRS7B in the Corona Australis cluster"
    G. Sabatini, L. Podio, C. Codella, Y. Watanabe, M. De Simone, E. Bianchi, C. Ceccarelli, C.J. Chandler, N. Sakai, B. Svoboda, L. Testi, Y. Aikawa, N. Balucani, M. Bouvier, P. Caselli, E. Caux, L. Chahine, S. Charnley, N. Cuello, F. Dulieu, L. Evans, D. Fedele, S. Feng, F. Fontani, T. Hama, T. Hanawa, E. Herbst, T. Hirota, A. Isella, I. Jimenez-Serra, D. Johnstone, B. Lefloch, R. Le Gal, L. Loinard, H.B. Liu, A. Lopez-Sepulcre, L.T. Maud, M.J. Maureira, F. Menard, A. Miotello, G. Moellenbrock, H. Nomura, Y. Oba, S. Ohashi, Y. Okoda, Y. Oya, J. Pineda, A. Rimola, T. Sakai, D. Segura-Cox, Y. Shirley, C. Vastel, S. Viti, N. Watanabe, Y. Zhang, Z.E. Zhang, S. Yamamoto
    Astronomy & Astrophyscs, 684, L12 (2024).


    2023

  10. "Polycyclic aromatic hydrocarbons in samples of Ryugu formed in the interstellar medium"
    Sarah Zeichner, Jose C. Aponte, Surjyendu Bhattacharjee, Guannan Dong, Amy E. Hofmann, Jason P. Dworkin, Daniel P. Glavin, Jamie E. Elsila, Heather V. Graham, Hiroshi Naraoka, Yoshinori Takano, Shogo Tachibana, Allison T. Karp, Kliti Grice, Alex I. Holman, Katherine H. Freeman, Hisayoshi Yurimoto, Tomoki Nakamura, Takaaki Noguchi, Ryuji Okazaki, Hikaru Yabuta, Kanako Sakamoto, Toru Yada, Masahiro Nishimura, Aiko Nakato, Akiko Miyazaki, Kasumi Yogata, Masanao Abe, Tatsuaki Okada, Tomohiro Usui, Makoto Yoshikawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Satoru Nakazawa, Sei-ichiro Watanabe, Yuichi Tsuda, Kenji Hamase, Kazuhiko Fukushima, Dan Aoki, Minako Hashiguchi, Hajime Mita, Yoshito Chikaraishi, Naohiko Ohkouchi, Nanako O. Ogawa, Saburo Sakai, Eric T. Parker, Hannah L. McLain, Francois-Regis Orthous-Daunay, Veronique Vuitton, Roland Thissen, Cedric Wolters, Philippe Schmitt-Kopplin, Alexander Ruf , Junko Isa, Norbert Hertkorn, Yasuhiro Oba, Toshiki Koga, Toshihiro Yoshimura, Daisuke Araoka, Haruna Sugahara, Aogu Furusho, Kazunori Sasaki, Hajime Sato, Yoshihiro Furukawa, Junken Aoki, Kuniyuki Kano, Shin-ichiro M. Nomura, Takaaki Yoshikawa, Satoru Tanaka, Mayu Morita, Morihiko Onose, Fumie Kabashima, Kosuke Fujishima, Tomoya Yamazaki, Yuki Kimura, John M. Eiler
    Science, 382, 1411-1416 (2023).

  11. "Determination of the branching ratio of CH3OH + OH reaction on water ice surface at 10 K"
    A. Ishibashi, H. Hidaka, W. M. C. Sameera, Y. Oba, N. Watanabe
    Astrophysical Journal, 960, 90 (2023).

  12. "Chemical evolution of primordial salts and organic sulfur molecules in the asteroid 162173 Ryugu"
    Toshihiro Yoshimura, Yoshinori Takano, Hiroshi Naraoka, Toshiki Koga, Daisuke Araoka, Nanako O. Ogawa, Philippe Schmitt-Kopplin, Norbert Hertkorn, Yasuhiro Oba, Jason P. Dworkin, José C. Aponte, Takaaki Yoshikawa, Satoru Tanaka, Naohiko Ohkouchi, Minako Hashiguchi, Hannah McLain, Eric T. Parker, Saburo Sakai, Mihoko Yamaguchi, Takahiro Suzuki, Tetsuya Yokoyama, Hisayoshi Yurimoto, Tomoki Nakamura, Takaaki Noguchi, Ryuji Okazaki, Hikaru Yabuta, Kanako Sakamoto, Toru Yada, Masahiro Nishimura, Aiko Nakato, Akiko Miyazaki, Kasumi Yogata, Masanao Abe, Tatsuaki Okada, Tomohiro Usui, Makoto Yoshikawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Satoru Nakazawa, Sei-ichiro Watanabe, Yuichi Tsuda, Shogo Tachibana, Hayabusa2 SOM team
    Nature Communications, 14, 5284 (2023)
    Press Release from JAMSTEC


  13. "Ryugu asteroid sample return provides a natural laboratory for primordial chemical evolution"
    Yasuhiro Oba, Yoshinori Takano, Jason P. Dworkin, Hiroshi Naraoka
    Nature Communications, 14, 3107 (2023)
    *This is a Comment article directly commissioned by the Nature Communications editorial team

  14. "Uracil in the carbonaceous asteroid (162173) Ryugu"
    Yasuhiro Oba, Toshiki Koga, Yoshinori Takano, Nanako O. Ogawa, Naohiko Ohkouchi, Daniel P. Glavin, Jason P. Dworkin, Hiroshi Naraoka, Shogo Tachibana, Hisayoshi Yurimoto, Tomoki Nakamura, Takaaki Noguchi, Ryuji Okazaki, Hikaru Yabuta, Kanako Sakamoto, Toru Yada, Masahiro Nishimura, Aiko Nakato, Akiko Miyazaki, Kasumi Yogata, Masanao Abe, Tatsuaki Okada, Tomohiro Usui, Makoto Yoshikawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Satoru Nakazawa, Sei-ichiro Watanabe, Yuichi Tsuda, Hayabusa2-initial-analysis SOM team
    Nature Communications, 14, 1292 (2023)
    (This article was selected as "Editors' Highlights")
    Press Release from Hokkaido University
    15. *This article is highlighted in "CNN" and many others

  15. "A systematic mechanisttic survery on the reactions between OH radical and CH3OH on ice"
    W. M. C. Sameera, A. P. Jayaweera, A. Ishibashi, H. Hidaka, Y. Oba, N. Watanabe
    Faraday Discussions, 245, 508-518 (2023)

  16. "The spatial distribution of soluble organic matter and their relationship to minerals in the asteroid (162173) Ryugu"
    Minako Hashiguchi, Dan Aoki, Kazuhiko Fukushima, Hiroshi Naraoka, Yoshinori Takano, Jason P. Dworkin, Karin E. Dworkin, José C. Aponte, Jamie E. Elsila, John M. Eiler, Yoshihiro Furukawa, Aogu Furusho, Daniel P. Glavin, Heather V. Graham, Kenji Hamase, Norbert Hertkorn, Junko Isa, Toshiki Koga, Hannah L. McLain, Hajime Mita, Yasuhiro Oba, Nanako O. Ogawa, Naohiko Ohkouchi, Francois-Regis Orthous-Daunay, Eric T. Parker, Alexander Ruf, Saburo Sakai, Philippe Schmitt-Kopplin, Haruna Sugahara, Roland Thissen, Véronique Vuitton, Cédric Wolters, Toshihiro Yoshimura, Hisayoshi Yurimoto, Tomoki Nakamura, Takaaki Noguchi, Ryuji Okazaki, Hikaru Yabuta, Kanako Sakamoto, Shogo Tachibana, Toru Yada, Masahiro Nishimura, Aiko Nakato, Akiko Miyazaki, Kasumi Yogata, Masanao Abe, Tomohiro Usui, Takanao Saiki, Takanao Saiki, Fuyuto Terui, Nakazawa Satoru, Sei-ichiro Watanabe, Yuichi Tsuda,
    Earth, Planets, and Space, 75, Article Number 73 (25pp). (2023)

  17. "Soluble organic molecules in samples of the carbonaceous asteroid (162173) Ryugu"
    H. Naraoka, Y. Takano, J. P. Dworkin, Y. Oba, K. Hamase, A. Furusho, N. O. Ogawa, M. Hashiguchi, K. Fukushima, D. Aoki, P. Schmitt-Kopplin, J. C. Aponte, E. T. Parker, D. P. Glavin, H. L. McLain, J. E. Elsila, H. V. Graham, J. M. Eiler, F.-R. Orthous-Daunay, C. Wolters, J. Issa, T. Koga, N. Ohkouchi, Y. Chikaraishi, H. Sugahara, H. Mita, Y. Furukawa, N. Hertkorn, A. Ruf, H. Yurimoto, T. Nakamura, T. Noguchi, R. Okazaki, H. Yabuta, K. Sakamoto, S. Tachibana, H. C. Connolly, Jr., D. S. Lauretta, M. Abe, T. Yada, M. Hshimura, K. Yogata, A.Nakato, M. Yoshitake, A. Suzuki, A. Miyazaki, S. Furuya, K.Hatakeda, H. Soejima, Y. Hitomi, K. Kumagai, T. Usui, T.Hayashi, D. Yamamoto, R. Fukai, K. Kitazato, S. Sugita, N. Namiki, M. Arakawa, H. Ikeda, M. Ishiguro, N. Hirata, K. Wada, Y. Ishihara, R. Noguchi, T. Morota, N. Sakatani, K. Matsumoto, H. Senshu, R. Honda, E. Tatsumi, Y. Yokota, C. Honda, T. Michikami, M. Matsuoka, A. Miura, H. Noda, T. Yamada, K. Yoshihara, K. Kawahara, M. Ozaki, Y.-i. Iijima, H. Yano, M. Hayakawa, T. Iwata, R. Tsukizaki, H. Sawada, S. Hosoda, K. Ogawa, C. Okamoto, N. Hirata, K. Shirai, Y. Shimaki, M. Yamada, T. Okada, Y. Yamamoto, H. Takeuchi, A. Fujii, Y. Takei, K. Yoshikawa, Y. Mimasu, G. Ono, N. Ogawa, S. Kikuchi, S. Nakazawa, F. Terui, S. Tanaka, T. Saiki, M. Yoshikawa, S.-i. Watanabe, Y. Tsuda
    Science, 379, eabn9033, (2023)
    press release (in Japanese)


  18. "Surface reaction of methyl mercaptan (CH3SH) with hydrogen atoms on amorphous solid water"
    Thanh Nguyen, Yasuhiro Oba, W. M. C. Sameera, Kenji Furuya, Akira Kouchi, Naoki Watanabe
    Astrophysical Journal, 944, 219 (2023)

    2022

  19. "Maleimide Index: A paleo-redox index based on the fragmented fossile-chlorophylls obtained by chromic acid oxidation"
    Kenta Asahina, Satoshi Takahashi, Ryosuke Saito, Kunio Kaiho, Yasuhiro Oba
    RSC Advances, 12, 31061 (2022)

  20. "Chemical and Physical Characterization of the Isolated Protostellar Source CB68: FAUST IV"
    Muneaki Imai, Yoko Oya, Brian Svoboda, Hauyu Baobab Liu, Bertrand Lefloch, Serena Viti, Yichen Zhang, Cecilia Ceccarelli, Claudio Codella, Claire J. Chandler, Nami Sakai, Yuri Aikawa, Felipe O. Alves, Nadia Balucani, Eleonora Bianchi, Mathilde Bouvier, Gemma Busquet, Paola Caselli, Emmanuel Caux, Steven Charnley, Spandan Choudhury, Nicolas Cuello, Marta De Simone, Francois Dulieu, Aurora Duráan, Lucy Evans, Cécile Favre, Davide Fedele, Siyi Feng, Francesco Fontani, Logan Francis, Tetsuya Hama, Tomoyuki Hanawa, Eric Herbst, Shingo Hirano, Tomoya Hirota, Andrea Isella, Izaskun Jímenez-Serra, Doug Johnstone, Claudine Kahane, Romane Le Gal, Laurent Loinard, Ana López-Sepulcre, Luke T. Maud, María José Maureira, Francois Menard, Seyma Mercimek, Anna Miotello, George Moellenbrock, Shoji Mori, Nadia M. Murillo, Riouhei Nakatani, Hideko Nomura, Yasuhiro Oba, Ross O’Donoghue, Satoshi Ohashi, Yuki Okoda, Juan Ospina-Zamudio, Jaime Pineda, Linda Podio, Albert Rimola, Takeshi Sakai, Dominique Segura-Cox, Yancy Shirley, Vianney Taquet, Leonardo Testi, Charlotte Vastel, Naoki Watanabe, Yoshimasa Watanabe, Arezu Witzel, Ci Xue, Bo Zhao, Satoshi Yamamoto
    Astrophysical Journal, 934, 70 (2022)

  21. "FAUST V: Hot methanol in the [BHB2007] 11 protobinary system"
    C. Vastel, F. Alves, C. Ceccarelli, M. Bouvier, I. Jimenez-Serra, T. Sakai, P. Caselli, L. Evans, F. Fontani, R. Le Gal, C. J. Chandler, B. Svoboda, L. Maud, C. Codella, N. Sakai, A. Lopez-Sepulcre, G. Moellenbrock, Y. Aikawa, N. Balucani, E. Bianchi, G. Busquet, E. Caux, S. Charnley, N. Cuello, M. De Simone, F. Dulieu, A. Duran, D. Fedele, S. Feng, L. Francis, T. Hama, T. Hanawa, E. Herbst, T. Hirota, M. Imai, A. Isella, D. Johnstone, B. Lefloch, L. Loinard, M. Maureira, N. M. Murillo, S. Mercimek, S. Mori, F. Menard, A. Miotello, R. Nakatani, H. Nomura, Y. Oba, S. Ohashi, Y. Okoda, J. Ospina-Zamudio, Y. Oya, J. E. Pineda, L. Podio, A. Rimola, D. Segura Cox, Y. Shirley, L. Testi, S. Viti, N. Watanabe, Y. Watanabe, A. Witzel, C. Xue, Y. Zhang, B. Zhao, S. Yamamoto
    Astronomy & Astrophysics, 664, A171 (2022)

  22. "Diffusion activation energy and desorption activation energy for astrochemically relevant species on water ice show no clear relation"
    Kenji Furuya, Tetsuya Hama, Yasuhiro Oba, Akira Kouchi, Naoki Watanabe, Yuri Aikawa
    The Astrophysical Journal Letters, 933, L16 (13pp) (2022)


  23. "Quantum chemical modelling of the radical chemistry on ice surfaces: An integrated quantum chemical and experimental approach"
    W. M. C. Sameera, B. Senevirathne, T. Nguyen, Y. Oba, A. Ishibashi, M. Tsuge, H. Hidaka, N. Watanabe
    Frontiers in Astronomy and Space Sciences, 9, 890161 (2022)

  24. Identifying the wide diversity of extraterrestrial purine and pyrimidine nucleobases in carbonaceous meteorites"
    Y. Oba, Y. Takano, Y. Furukawa, T. Koga, D. P. Glavin, J. P. Dworkin, H. Naraoka
    Nature Communications, 13, 2008 (2022)
    Featured in NASA Goddard Website
    25. *This article is highlighted in "USA TODAY" and many others
    This paper is selected as "Top 25 Earth, Environmental,and Planetary Sciences Articles of 2022" published in Nature Communications

  25. "Hydrogen abstraction reactions in formic and thioformic acid isomers by hydrogen and deuterium atoms"
    G. Molpeceres, I. Jímenez-Serra, Y. Oba, T. Nguyen, N. Watanabe, J. García de la Concepción, B. Maté, R. Oliveira, J. Kästner
    Astronomy & Astrophysics, 663, A41 (2022)

  26. "Quantifying the chemical desorption of H2S and PH3 from amorphous water ice surfaces"
    K. Furuya, Y. Oba, T. Shimonishi
    Astrophysical Journal, 926, 171 (17pp) (2022)

  27. "Misaligned rotations of the envelope, outflow, and disks in the multiple protostellar system of VLA4 1623-2417: FAUST. III"
    Satoshi Ohashi, Claudio Codella, Nami Sakai, Claire J. Chandler, Cecilia Ceccarelli, Felipe Alves, Davide Fedele, Tomoyuki Hanawa, Aurora Durán, Cécile Favre, Ana López-Sepulcre, Laurent Loinard, Seyma Mercimek, Nadia M. Murillo, Linda Podio, Yichen Zhang, Yuri Aikawa, Nadia Balucani, Eleonora Bianchi, Mathilde Bouvier, Gemma Busquet, Paola Caselli, Emmanuel Caux, Steven Charnley, Spandan Choudhury, Nicolas Cuello, Marta De Simone, Francois Dulieu, Lucy Evans, Siyi Feng, Francesco Fontani, Logan Francis, Tetsuya Hama, Eric Herbst, Shingo Hirano, Tomoya Hirota, Muneaki Imai, Andrea Isella, Izaskun Jímenez-Serra, Doug Johnstone, Claudine Kahane, Romane Le Gal, Bertrand Lefloch, Luke T. Maud, Maria Jose Maureira, Francois Menard, Anna Miotello, George Moellenbrock, Shoji Mori, Riouhei Nakatani, Hideko Nomura, Yasuhiro Oba, Ross O'Donoghue, Yuki Okoda, Juan Ospina-Zamudio, Yoko Oya, Jaime Pineda, Albert Rimola, Takeshi Sakai, Dominique Segura-Cox, Yancy Shirley, Brian Svoboda, Vianney Taquet, Leonardo Testi, Charlotte Vastel, Serena Viti, Naoki Watanabe, Yoshimasa Watanabe, Arezu Witzel, Ci Xue, Bo Zhao and Satoshi Yamamoto
    Astrophysical Journal, 927, 54 (22pp) (2022)


  28. "UV-Induced Formation of Ice XI Observed Using an Ultra-High Vacuum Cryogenic Transmission Electron Microscope and its Implications for Planetary Science"
    Akira Kouchi, Yuki Kimura, Kensei Kitajima, Hiroyasu Katsuno, Hiroshi Hidaka, Yasuhiro Oba, Masashi Tsuge, Tomoya Yamazaki, Kazuyuki Fujita, Tetsuya Hama, Yukihiro Takahashi, Shunichi Nakatsubo, Naoki Watanabe
    Frontiers in Chemistry, 9, 799851 (2021)

  29. "Successive H-atom addition to solid OCS on compact amorphous solid water"
    T. Nguyen, Y. Oba, W. M. C. Sameera, A. Kouchi, N. Watanabe.
    Astrophysical Journal, 922, 146 (2021)

  30. "Efficient formation pathway of methyl formate: The role of OH radicals on ice dust"
    A. Ishibashi, H. Hidaka, Y. Oba, A. Kouchi, N. Watanabe.
    Astrophysical Journal Letters, 921, L13 (9pp) (2021)

  31. "Experimental and computational studies on the physico-chemical behavior of phosphine induced by reactions with H and D atoms on interstellar grains"
    T. Nguyen, Y. Oba, W. M. C. Sameera, A. Kouchi, N. Watanabe.
    Astrophysical Journal, 918, 73 (15pp) (2021)

  32. "Transmission electron microscopy study of the morphology of ices composed of H2O, CO2, and CO on refractory grains"
    A. Kouchi, M. Tsuge, T. Hama, Y. Oba, S. Okuzumi, S.-i. Sirono, M. Momose, N. Nakatani, K. Furuya, T. Shimonishi, T. Yamazaki, H. Hidaka, Y. Kimura, K.-i. Murata, K. Fujita, S. Nakatsubo, S. Tachibana, N. Watanabe.
    Astrophysical Journal, 918, 45 (20pp) (2021)

  33. "Formation of chiral CO polyhedral crystals on icy interstellar grains"
    A. Kouchi, M. Tsuge, T. Hama, H. Niinomi, N. Nakatani, T. Shimonishi, Y. Oba, Y. Kimura, S.-i. Sirono, S. Okuzumi, M. Momose, K. Furuya, N. Watanabe.
    Monthly Notices of the Royal Astronomical Society, 505, 1530-1542 (2021)

  34. "Analytical development of seamless procedures on cation-exchange chromatography and ion-pair chromatography with high-precision mass spectrometry for short-chain peptides"
    Y. Takano, Y. Oba, S. Furota, H. Naraoka, N. Ogawa, T. M. Blattmann, N. Ohkouchi
    International Journal of Mass Spectrometry, 463, 116529 (2021)

  35. "FAUST II. Discovery of a secondary outflow in IRAS 15398-3359: Variability in outflow direction during the earliest stage of star formation?"
    Y. Okoda, Y. Oya, L. Francis, D. Johnstone, S. Inutsuka, C. Ceccarelli, C. Codella, C. Chandler, N. Sakai, Y. Aikawa, F. Alves, N. Balucani, E. Bianchi, M. Bouvier, P. Caselli, E. Caux, S. Charnley, S. Choudhury,M. de Simone, F. Dulieu, A. Duran, L. Evans, C. Favre, D. Fedele, S. Feng, F. Fontani, T. Hama, T. Hanawa, E. Herbst, T. Hirota, M. Imai, A. Isella, I. Jimenez-Serra, C. Kahane, B. Lefloch, L. Loinard, A. Lopez-Sepulcre, L. T. Maud, M. J. Maureira, F. Menard, S. Mercimek, A. Miotello, G. Moellenbrock, S. Mori, N. M. Murillo, R. Nakatani, H. Nomura, Y. Oba, R. O'Donoghue, S. Ohashi, J. Ospina-Zamudio, J. Pineda, L. Podio, A. Rimola, T. Sakai, D. S. Cox, Y. Shirley, B. Svoboda, V. Taquet, L. Testi, C. Vastel, S. Viti, N. Watanabe, Y. Watanabe, A. Witzel, C. Xue, Y. Zhang, B. Zhao, S. Yamamoto
    Astrophysical Journal, 910, 11(13pp) (2021)

    2020

  36. "Extraterrestrial hexamethylenetetramine in meteorites-a precursor of prebiotic chemistry in the inner solar system"
    Y. Oba, Y. Takano, H. Naraoka, Y. Furukawa, D. P. Glavin, J. P. Dworkin, S. Tachibana
    Nature Communications, 11, 6243 (2020)
    Press release "Key building block for organic melecules discovered in meteorites", Hokkaido University

    37. *This article is highlighted in "Physics.Org" and many others

  37. "Precometary organic matter: A hidden reservoir of water inside the snow line"
    H. Nakano, N. Hirakawa, Y. Matsubara, S. Yamashita, T. Okuchi, K. Asahina, R. Tanaka, N. Suzuki, H. Naraoka, Y. Takano, S. Tachibana, T. Hama, Y. Oba, Y. Kimura, N. Watanabe, & A. Kouchi
    Scientific Reports, 10, 7755 (2020)


  38. "FAUST I. The hot corino at the heart of the prototypical Class I protostar L1551 IRS5"
    E. Bianchi, C. Chandler, C. Ceccarelli, C. Codella, N. Sakai, A. Lopez-Sepulcre, L. T. Maud, G. Moellenbrock, B. Svoboda, Y. Watanabe, T. Sakai, F. Menard, Y. Aikawa, F. Alves, N. Balucani, M. de Simone, F. Dulieu, A. Duran, L. Evans, C. Favre, D. Fedele, S. Feng, F. Fontani, L. Francis, T. Hama, T. Hanawa, E. Herbst, T. Hirota, M. Imai, A. Isella, I. Jimenez-Serra, D. Johnstone, C. Kahane, B. Lefloch, N. M. Murillo, R. Nakatani, H. Nomura, Y. Oba, S. Ohashi, Y. Okoda, J. Ospina-Zamudio, Y. Oya, J. Pineda, L. Podio, A. Rimola, D. S. Cox, Y. Shirley, V. Taquet, L. Testi, C. Vastel, S. Viti, N. Watanabe, A. Witzel, C. Xue, Y. Zhang, B. Zhao, & S. Yamamoto
    Monthly Notices of the Royal Astronomical Society Letters, 498, L87-L92 (2020).


  39. "UV-ray irradiation never causes amorphization of crystalline CO2: A transmission electron microscopy study"
    M. Tsuge, T. Nguyen, Y. Oba, T. Hama, A. Kouchi, and N. Watanabe
    Chemical Physics Letters, 760, 137999 (2020)

  40. "An experimental study of chemical desorption for phosphine in interstellar ice"
    T. Nguyen, Y. Oba, A. Kouchi, and N. Watanabe
    Astrophysical Journal Letters, 898, L52 (6pp) (2020)

    2019

  41. "Nucleobase synthesis in interstellar ices"
    Oba Y.,Takano Y., Naraoka H., Watanabe N. and Kouchi A.
    Nature Communications, 10, 4413 (2019)
    Press release "Life's building blocks may have formed in interstellar clouds", Hokkaido University

    42. *This article is highlighted in "Fox News" and many others

  42. "Physico-chemical behabior of hydrogen sulfide induced by reactions with H and D atoms on different types of ice surfaces at low temperature"
    Oba Y.,Tomaru T., Kouchi A. and Watanabe N.
    Astrophysical Journal, 874,124 (8pp) (2019)
    2018

  43. "An infrared measurement of chemical desorption from interstellar ice analogues"
    Oba Y.,Tomaru T., Lamberts T., Kouchi A. and Watanabe N.
    Nature Astronomy, 2, 228-232 (2018) doi:10.1038/s41550-018-0380-9
    Press release "Baby, it’s cold outside: understanding conditions for star formation", Hokkaido University

    2017

  44. "Deuterium fractionation upon the formation of hexamethylenetetramines through photochemical reactions of interstellar ice analogs containing deuterated methanol isotopologues"
    Oba Y.,Takano Y., Naraoka H., Kouchi A. and Watanabe N.
    Astrophysical Journal, 849, 122 (9pp) (2017)


  45. "Liquid-like behavior of UV-irradiated interstellar ice analog at low temperatures"
    Tachibana S., Kouchi A., Hama T., Oba Y., Piani L., Sugawara I., Endo Y., Hidaka H., Kimura Y., Murata K., Yurimoto H, and Watanabe N.
    Science Advances, 3, eaao2538 (2017)


    46. 2016

  46. "Negative catalytic effect of water on the reactivity of hydrogen abstraction from the C-H bond of dimethyl ether by deuterium atoms through tunneling at low temperatures"
    Oba Y., Watanabe N., and Kouchi A.
    Chemical Physics Letters, 662, 14-18 (2016)
    *This article is selected as "Editors Choice".


  47. "Hydrogen-deuterium substitution in solid ethanol by surface reactions at low temperatures"
    Oba Y., Osaka K., Chigai T., Kouchi A., and Watanabe N.
    Monthly Notices of Royal Astronomical Society, 462, 689-695 (2016)


  48. "Deuterium fractionation during amino acid formation by photolysis of interstellar ice analogues containing deuterated methanol"
    Oba Y.,Takano Y., Watanabe N., and Kouchi A.
    Astrophysical Journal Letters, 827, L18 (7pp) (2016)


    49. 2015

  49. "Chiral Glycine Formation on Cold Interstellar Grains by Quantum Tunneling Hydrogen-Deuterium Substitution Reactions"
    Oba Y., Watanabe N., Osamura Y., and Kouchi A.
    Chemical Physics Letters, 634, 53-59 (2015)
    *This article is selected as "Editors Choice".
    *This article is highlighted in "The Conversation"
    *This article is highlighted in "Cosmos Magagine"
    Press release "Formation Route of First Chiral Amino Acid in the Universe Clarified", Hokkaido University


    50. 2014

  50. "Hydrogen Isotopic Substitution of Solid Methylamine through Atomic Surface Reactions at Low Temperatures: A Potential Contribution to the D/H Ratio of Methylamine in Molecular Clouds"
    Oba Y., Chigai T., Osamura Y., Watanabe N., and Kouchi A.
    Meteoritics & Planetary Science, 49, 117-132 (2014)


  51. "Reaction kinetics and isotope effect of water formation by the surface reaction of solid H2O2 with H atoms at low temperatures"
    Oba Y., Osaka K., Watanabe N., Chigai T., and Kouchi A.
    Faraday Discussions, 168, 185-204 (2014)


    52. 2012

  52. "Physicochemical Processes of Hydrogen on Cosmic Dust in Molecular Clouds"
    Naoki WATANABE, Akira KOUCHI, Tetsuya HAMA, Hiroshi HIDAKA, Yasuhiro OBA, Takeshi CHIGAI
    Hyomen Kagaku (in Japanese), 33, 662-668 (2012)


  53. "Octanol-water partition coefficients (Kow) vs. pH for fluorescent dye tracers (fluorescein, eosin Y), and implications for hydrologic tracer tests"
    Oba Y., and Poulson S. R.
    Geochemical Journal, 46, 517-520 (2012)


  54. "Water formation through a quantum tunneling surface reaction, OH + H2, at 10 K"
    Oba Y., Watanabe N., Hama T., Kuwahata K., Hidaka H., and Kouchi A.
    The Astrophysical Journal, 749, 67(12pp) (2012)


    55. 2011

  55. "Experimental studies of surface reactions among OH radicals that yield H2O and CO2 at 40-60 K"
    Oba Y., Watanabe N., Kouchi A., Hama T., and Pirronello V.
    Physical Chemistry Chemical Physics, 13, 15792-15797 (2011)


  56. "Experimental studies on the formation of carbon dioxide in interstellar molecular clouds"
    Yasuhiro OBA, Naoki WATANABE, Akira KOUCHI, Tetsuya HAMA, Valerio PIRRONELLO
    Chikyu Kagaku (in Japanese), 45, 213-226 (2011)


  57. "Stable isotopic composition of organic compouds in carbonaceous chondrites and their fractionation processes"
    Yasuhiro OBA
    Researches in Organic Geochemistry (in Japanese), 27, 103-115 (2011)


    58. 2010

  58. "Formation of carbonic acid (H2CO3) by surface reactions of non-energetic OH radicals with CO molecules at low temperatures"
    Oba Y., Watanabe N., Kouchi A., Hama T., and Pirronello V.
    The Astrophysical Journal, 722, 1598-1606 (2010)


  59. "Vertical carbon isotope change in acetate in a surface sediment from the northwestern Pacific Ocean"
    Kaneko, M., Oba Y., and Naraoka, H
    Researches in Organic Geochemistry, 26, 73-79 (2010)


  60. "Direct evidence for ammonium ion formation in ice through ultraviolet-induced acid-base reaction of NH3 with H3O+"
    Moon E.-S., Kang H., Oba Y., Watanabe N., and Kouchi A.
    The Astrophysical Journal, 713, 906-911 (2010)


  61. "Experimental study of CO2 formation by surface reactions of non-energetic OH radicals with CO molecules"
    Oba Y., Watanabe N., Kouchi A., Hama T., and Pirronello V.
    The Astrophysical Journal, 712, L174-L178 (2010)


  62. "Diel behavior of stable isotopes of dissolved oxygen and dissolved inorganic carbon in rivers over a range of trophic conditions, and in a mesocosm experiment"
    S. R. Parker, C. H. Gammons, S. R. Poulson, M. D. DeGrandpre, C. L. Weyer, M. G. Smith, J. N. Babcock, and Oba Y.
    Chemical Geology, 269, 22-32 (2010)


    63. 2009

  63. "Oxygen isotope fractionation of dissolved oxygen during abiological reduction by aqueous sulfide"
    Oba Y., and Poulson S.R.
    Chemical Geology, 268, 226-232 (2009)


  64. "Elemental and isotope behavior of macromolecular organic matter from CM chondrites during hydrous pyrolysis"
    Oba Y., and Naraoka H.
    Meteoritics and Planetary Science, 44, 943-953 (2009)


  65. "Formation of compact amorphous H2O ice by codeposition of hydrogen atoms with oxygen molecules on grain surfaces"
    Oba Y., Miyauchi N., Chigai T., Hidaka H., Watanabe N., and Kouchi A.
    The Astrophysical Journal, 701, 464-470 (2009)


  66. "Oxygen isotope fractionation of dissolved oxygen during reduction by ferrous iron"
    Oba Y., and Poulson S.R.
    Geochimica et Cosmochimica Acta, 73, 13-24 (2009)


  67. "Formation of water molecule by surface atomic reactions on interstellar grains at low temperatures"
    Yasuhiro OBA，Naoya MIYAUCHI，Takeshi CHIGAI，Hiroshi HIDAKA，Naoki WATANABE，Akira KOUCHI
    Chikyu Kagaku (in Japanese), 43, 117-131 (2009)


    68. 2008

  68. "Carbon and hydrogen isotopic fractionation of low molecular weight organic compounds during ultraviolet degradation"
    Oba Y., and Naraoka H.
    Organic Geochemistry, 35, 501-509 (2008)


  69. "Compound-specific isotope analysis (CSIA) by gas chromatograph/isotope ratio mass spectrometer (GC/IRMS)"
    Yoshito CHIKARAISHI，Yasuhiro OBA
    Researches in Organic Geochemistry (in Japanese), 23/24, 99-122 (2008)


    70. 2007

  70. "Carbon and hydrogen isotope fractionation of acetic acid during degradation by ultraviolet light"
    Oba Y., and Naraoka H.
    Geochemical Journal, 41, 103-110 (2007)


    71. 2006

  71. "Site-specific carbon isotope analysis of aromatic carboxylic acids by elemental analysis-pyrolysis-isotope ratio mass spectrometry"
    Oba Y., and Naraoka H.
    Rapid Communications in Mass Spectrometry, 20, 3649-3653 (2006)


  72. "Carbon isotopic composition of acetic acid generated by hydrous pyrolysis of macromolecular organic matter from the Murchison meteorite"
    Oba Y., and Naraoka H.
    Meteoritics and Planetary Science, 41, 1175-1181 (2006)


    73. 2003

  73. "Different behavior of hydrogen isotope exchange in aqueous solutions between two PAH isomers (fluoranthene and pyrene)"
    Oba Y., and Naraoka H.
    Researches in Organic Geochemistry, 18, 29-35 (2003)

Conference Proceedings


  1. V. Pirronello, M. Accolla, T. Hama, H. Hidaka, A. Kouchi, G. Manico,
    Y. Oba, and N. Watanabe
    "Laboratory investigations of physico-chemical processes occurring in icy mantles on interstellar dust grains"
    Physics and Chemistry of ice 2010, pp 361-368, Hokkaido University press (2011)


  2. Y. Oba, N. Miyauchi, T. Chigai, H. Hidaka, N. Watanabe, and A. Kouchi
    "Formation of H2O ice through the surface reaction O2 + H at low temperatures: Reaction kinetics and structure of the ice"
    Physics and Chemistry of ice 2010, pp 369-378, Hokkaido University press (2011)


  3. A. Kouchi, N. Watanabe, H. Hidaka, N. Miyauchi, Oba Y., and T. Chigai,
    "Formation of amorphous H2O ice from the reactions of cold H atoms with solid O2 at 10K"
    Cosmic Dust-Near & Far, ASP Conference Series 414, 338, (2009)


  4. N. Watanabe, A. Kouchi, H. Hidaka, Oba Y., and N. Miyauchi,
    "Nonenergetic reactions between atomic hydrogen and molecules on interstellar grain surfaces"
    XXVI International Conference on Photonic, Electronic and Atomic Collisions,
    Journal of Physics: Conference Series,     194, 012044, (2009)

Invited talks

  1. "Search for our origin in space" JpGU2024,Chiba, Japan, 28th May (2024)

  2. "Detection of nucleobases and other N-heterocycles in the sample returned from asteroid (101955) Bennu" JpGU2024, Chiba, Japan, 27th May (2024)

  3. "Chemical Evolution from the Interstellar Medium to the Solar System: Insight from the Analysis of Asteroidal Materials" ISM2023,Sapporo, Japan, 10th November (2023)

  4. "Chemical evolution from molecular clouds to star-forming regions, and beyond"
    5. Chemical Processes in Solar-type Star-Forming Regions,Toulouse, France, 8th June (2023)

  5. "Detection of nucleobases in extraterrestrial materials using liquid chromatography coupled with ultra high-resolution mass spectrometry"
    6. JPGU 2023 Meeting, Chiba, Japan, 25th May (2023)

  6. "Recent advances in analytical techniques for the identification of specific COMs in photochemically-processed interstellar ice analogs"
    7. 43rd COSPAR Scientific Assembly, F3.5,Sydney (online), 31st Jan.(2021)

  7. "H2S, why you no solid at 10 K? -Nonthermal desorption from interstellar icy grains"
    8. JPGU 2018 Meeting, Chiba, Japan, 22nd May (2018)

  8. "Experimental studies on the surface reaction of hydrogen sulfide with deuterium atoms on amorphous solid water at 10 K"
    9. ACS Spring National Meeting, New Orleans, USA, 21st March (2018)

  9. "Formation of chiral glycine by surface reactions of normal glycine with deuterium atoms at 10 K"
    10. Astrophysical Ices in the Lab (AILab),
    Madrid, Spain, 7-8th March (2016)

  10. "Formation and deuterium fractionation of water by low-temperature surface reactions in molecular clouds"
    11. Center for Astrochemical Studies Seminar, Munich, Germany, 13th October (2015)

  11. "Formation of H2O ice on cold interstellar grains: Reaction kinetics and the structure of ice"
    12. Workshop on Ice and Water Films,Seoul, Korea, 6-8 May (2013)

  12. "Co-evolution of water and organics via surface reactions on interstellar grains"
    13. JPGU 2013 Meeting,Chiba, Japan, 22 May (2013)

  13. "Structure of H2O ice formed by surface reactions of oxygen molecules with hydrogen atoms at low temperatures"
    14. 12th International Conference on the Physics and Chemistry of Ice, Hokkaido Univ., 5-10 September, (2010)

  14. "Formation of compact amorphous water ice by surface atomic reactions at low temperatures"
    15. 2010 Western Pacific Geophysics Meeting, Taipei, Taiwan, 22-25 June, (2010)


Award


  1. Nishida Prize (2023) "Organic astrochemical evolution in interstellar environment and the solar system"

  2. The Geochemistry Research Association Award for Progress in Geochemistry (2017) "Studies on organic molecules in carbonaceous chondrites and on molecules under simulated interstellar conditions using their stable isotope compositions by novel experimental methods"

  3. Young investigator award from The Japanese Association of Organic Geochemists (2010) "Stable isotope compositions of organic compounds in carbonaceous chondrites and its isotope fractionation processes"