Interaction between interstellar dust molecules with charged particle and mechanism of molecular evolutions

• Project/Area Number: 20K04028
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 16010:Astronomy-related
• Research Institution: Nihon University
• Principal Investigator: NAKAMURA Masato 日本大学, 理工学部, 特任教授 (00256801)
• Co-Investigator(Kenkyū-buntansha): 左近 樹 東京大学, 大学院理学系研究科(理学部), 准教授 (70451820)
• Project Period (FY): 2020-04-01 – 2025-03-31
• Project Status: Completed (Fiscal Year 2024)
• Budget Amount: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000); Fiscal Year 2022: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2021: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2020: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
• Keywords: 星間ダスト / 多環芳香族炭化水素分子 / イオン衝突 / 分子進化 / 星間化学 / 星間分子 / 分子解離 / 一酸化炭素分子 / PAH（芳香族炭化水素分子） / 星間塵 / 化学反応 / イオン分子反応 / 有機分子 / 荷電粒子 / 炭素質ダスト分子 / イオン分子衝突 / 星間物質 / 新星 / ナノ物質 / 芳香族炭化水素

Outline of Research at the Start

星間空間には星間塵(ダスト）と呼ばれる物質がある。ここには炭素を含む分子が存在し、これらがつねに星から発生する陽子などの荷電粒子によって衝撃を受けている。このような衝撃によって炭素を含む物質がどのように変性するかを理論計算と実験の両面から探る。特に窒素を含む環状炭化水素分子を研究対象として、荷電粒子との相互作用によりどのような変性を受けるかを考え、宇宙空間における分子進化を考えるうえでの一助としたい。

Outline of Final Research Achievements

Experimental and theoretical researches have been performed on molecular degeneration and evolution due to collisions between charged particles and dust molecules. Simulation calculations of collisions between dust molecules and charged particles have been performed. The calculated results suggest that dehydrogenation occurs due to collisions with charged particles. This result is consistent with experimental findings. Nitrogen-containing quenched carbonaceous material (QNCC) was synthesized in the laboratory. Its infrared spectrum presents similar profile to that observed in classical novae. Analysis of the structure of QNCC using infrared and X-ray spectroscopies showed that nitrogen atoms are encapsulated in the form of an amine structure of the QNCC.

Academic Significance and Societal Importance of the Research Achievements

本研究を通じて、星間空間でのダスト分子の変成の一端を明らかにしたことは意義深いことであると考えられる。さらに炭素質物質のダストのおける窒素原子の重要性を指摘した点は興味深い発見である。ダスト分子と荷電粒子との衝突過程を敬明することは、最終的には星間空間における生命関連物質の生成や、生命の起源の解明につながる可能性もある。

Research Products

• [Journal Article] Investigating C-D out-of-plane vibrational modes in PAHs as a tool to study interstellar deuterium-containing PAHs (2025)
  • Author(s): Buragohain Mridusmita、Onaka Takashi、Pathak Amit、Vats Akant、Sakon Itsuki
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 538 Issue: 4 Pages: 3130-3143
  • DOI: 10.1093/mnras/staf429
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] ALMA Observations of Peculiar Embedded Icy Objects (2025)
  • Author(s): Shimonishi Takashi、Onaka Takashi、Sakon Itsuki
  • Journal Title: The Astrophysical Journal Volume: 981 Issue: 1 Pages: 49-49
  • DOI: 10.3847/1538-4357/ada4ad
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Theoretical Rotational and Vibrational Investigation of Oxygen-Functionalized Interstellar PAHs (2024)
  • Author(s): Mishra Shivani、Vats Akant、Srivastav Satyam、Pathak Amit、Sarre Peter J、Onaka Takashi、Sakon Itsuki
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 536 Issue: 4 Pages: 3357-3365
  • DOI: 10.1093/mnras/stae2683
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Development of a cold chopper for TAO/MIMIZUKU: onboard test on MIMIZUKU (2024)
  • Author(s): Kinoshita Ryota、Kamizuka Takafumi、Miyata Takashi、Jikuya Ichiro、Kondo Tomoya、Yamada Katsuhiko、Honda Mitsuhiko、Sakanoi Takeshi、Kagitani Masato、Sako Shigeyuki、Hirao Yuki、Tachibana Kengo、Naruse Akira C.、Sakon Itsuki、Senoo Riko
  • Journal Title: Proceednigs of SPIE Volume: 13100 Pages: 267-267
  • DOI: 10.1117/12.3018708
  • Open Access / Int'l Joint Research
• [Journal Article] Development of a cold chopper for TAO/MIMIZUKU: repetitive control (2024)
  • Author(s): Hort Jonathan、Jikuya Ichiro、Kamizuka Takafumi、Lauer Anja、Sawodny Oliver、Kinoshita Ryota、Kondo Tomoya、Yamada Katsuhiko、Miyata Takashi、Honda Mitsuhiko、Sako Shigeyuki、Hirao Yuki、Tachibana Kengo、Naruse Akira、Sakon Itsuki、Senoo Riko、Sakanoi Takeshi、Kagitani Masato
  • Journal Title: Proceedings of SPIE Volume: 13100 Pages: 52-52
  • DOI: 10.1117/12.3020592
  • Open Access / Int'l Joint Research
• [Journal Article] The University of Tokyo Atacama Observatory 6.5-m telescope: screen camera system for the telescope mirror alignment (2024)
  • Author(s): Matsubayashi Kazuya、Kodama Emon、Minezaki Takeo、Takahashi Hidenori、Horiuchi Takashi、Sako Shigeyuki、Miyata Takashi、Yoshii Yuzuru、Doi Mamoru、Kohno Kotaro、Motohara Kentaro、Egusa Fumi、Sakon Itsuki、et al.
  • Journal Title: Proceedings of SPIE Volume: 130944 Pages: 1-6
  • DOI: 10.1117/12.3016581
  • Open Access / Int'l Joint Research
• [Journal Article] The University of Tokyo Atacama Observatory 6.5m telescope: project status 2024 (2024)
  • Author(s): Miyata Takashi、Yoshii Yuzuru、Doi Mamoru、Kohno Kotaro、Minezaki Takeo、Motohara Kentaro、Sako Shigeyuki、Egusa Fumi、Sakon Itsuki、et al.
  • Journal Title: Proceedings of SPIE Volume: 13094 Pages: 1-11
  • DOI: 10.1117/12.3018570
  • Open Access / Int'l Joint Research
• [Journal Article] Detection of a Broad 8μm feature in the Mid-Infrared Spectrum of WR125 Observved with Subaru/COMICS (2022)
  • Author(s): Endo, I., Lau, R., Sakon, I., Onaka T., Williams, P. M., Shenavrin, V. I.
  • Journal Title: Astrophysical Journal Volume: 930 Issue: 2 Pages: 116-116
  • DOI: 10.3847/1538-4357/ac63bd
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Morpho-kinematic Modeling of the Expanding Ejecta of the Extremely Slow Nova V1280 Scorpii (2022)
  • Author(s): Naito, H., Tajitsu, A., Ribeiro, V. A. R. M., Arai, A., Maehara, H., Kouzuma, S., Iijima, T., Okazaki, A. T., Watanabe, M., Takagi, S., Watanabe, F., Sakon, I., Sadakane, K
  • Journal Title: Astrophysical Journal Volume: 932 Issue: 1 Pages: 39-39
  • DOI: 10.3847/1538-4357/ac6c82
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Laboratory Measurements of Stretching Band Strengths of Deuterated Quenched Carbonaceous Composites (2022)
  • Author(s): Mori, T., Onaka, T., Sakon, I., Buragohain, M., Takahata, N., Nano, Y., Pathak, A.,
  • Journal Title: Astrophysical Journal Volume: 933 Issue: 1 Pages: 35-35
  • DOI: 10.3847/1538-4357/ac71ae
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Theoretical study of infrared spectra of interstellar PAH molecules with N, NH & NH2 incorporation (2022)
  • Author(s): A. Vats, A. Pathak, T. Onaka, M. Buragohain, I. Sakon, and I. Endo
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 74 Issue: 1 Pages: 161-174
  • DOI: 10.1093/pasj/psab116
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Near-infrared Spectroscopy of a Massive Young Stellar Object in the Direction toward the Galactic Center: XCN and Aromatic C-D Features (2022)
  • Author(s): Onaka, T., Sakon, I., Shimonishi, T.
  • Journal Title: Astrophysical Journal Volume: 941 Issue: 2 Pages: 190-190
  • DOI: 10.3847/1538-4357/ac9b15
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Profile of energy-loss spectrum in impulsive ion collision with heteronuclear diatomic molecules (2022)
  • Author(s): Masato Nakamura
  • Journal Title: Journal of Physical Society of Japan Volume: 91 Issue: 5
  • DOI: 10.7566/jpsj.91.054301
  • Peer Reviewed
• [Journal Article] On the nature of organic dust in novae (2021)
  • Author(s): I. Endo, I. Sakon, T. Onaka, Y. Kimura, S. Kimura, S. Wada, L. A. Helton, R. M. Lau, Y. Kebukawa, Y. Muramatsu, N. O. Ogawa, N. Ohkouchi, M. Nakamura, and S. Kwok
  • Journal Title: The Astrophysical Journal Volume: 917 Issue: 2 Pages: 103-103
  • DOI: 10.3847/1538-4357/ac0cf1
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] The Origins Space Telescope mission concept study team J. of Astronomical Telescopes, Instruments, and Systems, (2021)
  • Author(s): I.Sakon, T.L.Roellig, K.A.Ennico-Smith, T.Matsuo, Y.Ikeda, T.Yamamuro, K.Enya, T.Wada, M.Kawada, A.Takahashi, Y. Sarugaku, N.Fujishiro, N.Murakami, J.Nishikawa, T.Kotani, S.Goda, M.Ido, S.Itoh, T.Tsuboi, T.Sumi, M.Kamiura, T.Manome, N.Iida, K.Yanagibashi, T.P.Greene, B.P.Helvensteijn, L.Hofland, R.R.Johnson,他5名
  • Journal Title: J. of Astronomical Telescopes, Instruments, and Systems Volume: 7 Issue: 01 Pages: 011013-011013
  • DOI: 10.1117/1.jatis.7.1.011013
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Quenched Nitrogen-included Carbonacrous Composite (QNCC): A powerful candidate for the carriers of the UIR bands in classical novae (2020)
  • Author(s): I. Endo, I. Sakon, T. Onaka, A. L. Helton, R. M. Lau, S. Kimura, S. Wada, N. Ogawa, N. Ohkouchi, and Y. Kebukawa
  • Journal Title: Proceedings of the IAU Symposium Volume: 15 Issue: S350 Pages: 425-426
  • DOI: 10.1017/s1743921319006409
  • Open Access / Int'l Joint Research
• [Presentation] MAGNUM望遠鏡近赤外線４色同時撮像装置の概念設計と科学検討 (2025)
  • Author(s): 左近樹, 峰﨑岳夫, 鮫島寛明, 吉井譲, 永山貴宏, 中屋秀彦, 池田優二, 田中雅臣, 冨永望, 前田啓一 , 梅田秀之
  • Organizer: 日本天文学会2025年春季年会
• [Presentation] あかり衛星IRCカメラLG2スリット分光による銀河拡散光の中間赤外線分光観測 (2025)
  • Author(s): 鈴木はるか,左近樹,尾中敬,大坪貴文,高橋葵
  • Organizer: 日本天文学会2025年春季年会
• [Presentation] 低速イオンの衝突による分子の励起と解離過程 (2024)
  • Author(s): 中村正人
  • Organizer: 第49回原子衝突学会年会
• [Presentation] 星間ダストを構成する分子と荷電粒子との衝突 (2023)
  • Author(s): 中村正人 左近樹
  • Organizer: ナノ学会
• [Presentation] Collisional excitation and dissociation of dust molecules and nanoparticles by ion impacts in space and laboratories (2023)
  • Author(s): Masato Nakamura and Itsuki Sakon
  • Organizer: International Symposium on Small Particles and Inorganic Clusters
  • Int'l Joint Research
• [Presentation] 宇宙の有機物の塵の性質と役割の理解 (2023)
  • Author(s): 左近 樹、遠藤 いずみ、妹尾 梨子、尾中 敬、宮田 隆志、癸生川 陽子、小林 憲正、矢野 創、三田 肇、木村 勇気、中村 正人、小林 政弘、中村 浩章
  • Organizer: 日本地球惑星科学連合2023年大会
  • Invited
• [Presentation] 高温真空昇温脱離法 (TPD) を用いた模擬星間有機物ダストの化学構造の分析 (2023)
  • Author(s): 妹尾梨子、左近 樹
  • Organizer: 日本天文学会2023年秋季年会
• [Presentation] Collisional excitation and dissociation of CO molecules by ion impacts and applications to astrophysics (2023)
  • Author(s): Masato Nakamura
  • Organizer: DPG Spring Meeting of the Atomic, Molecular, Quantum Optics and Photonics Section (SAMOP)
  • Int'l Joint Research
• [Presentation] 宇宙における物質の形成と進化 (2023)
  • Author(s): 左近 樹、遠藤いずみ、妹尾梨子、尾中敬、宮田隆志、癸生川陽子、小林憲正、矢野創、三田肇、木村勇気、中村正人、小林政弘、中村浩章
  • Organizer: 日本地球惑星科学連合2023年大会
  • Invited
• [Presentation] Collisional excitation and dissociation of CO molecule by proton impact: application to astrophyics and astrochemistry (2022)
  • Author(s): Masato Nakamura
  • Organizer: The 23rd European Conference on the Dynamics of Molecular Systems (MOLEC 2022)
  • Int'l Joint Research
• [Presentation] 荷電粒子と一酸化炭素分子の衝突による振動回転励起と解離過程 (2022)
  • Author(s): 中村正人
  • Organizer: 原子衝突学会
• [Presentation] Towards the identification of carriers of the unidentified infrared (UIR) bands in novae (2021)
  • Author(s): Izumi Endo, Itsuki Sakon, Tak ashi Onaka, Yuki Kimura, Seiji Kimura, Setsuko Wada, L. Andrew Helton, Ryan M. Lau, Yoko Kebukawa, Yasuji Muramatsu, Nanako O. Ogawa, Naohiko Ohkouchi, Masato Nakamura and Sun Kwok
  • Organizer: The Origin of Outflows in Evolved Stars IAU Symposium No. 366, 2021 Virtual Meeting, 1-5 November 2021
  • Int'l Joint Research
• [Presentation] Nitrogen inclusion in organic dust in novae revealed by laboratory synthesis of Quenched Nitrogen-included Carbonaceous Composite (QNCC) (2021)
  • Author(s): I. Endo, I. Sakon, T. Onaka, Y. Kimura, S. Kimura, S. Wada, L. A. Helton, R. M. Lau, Y. Kebukawa, Y. Muramatsu, N. O. Ogawa, N. Ohkouchi, M. Nakamura, and S. Kwok
  • Organizer: Workshop on Interstellar Matter 2021
  • Int'l Joint Research
• [Book] アストロバイオロジー (シリーズ 現代の天文学) (2024)
  • Author(s): 左近樹（著）, 田村元秀, 井田茂, 田近英一, 山岸明彦（編）
  • Total Pages: 328
  • Publisher: 日本評論社
  • ISBN: 9784535607682
• [Book] 生命起源の事典 (2024)
  • Author(s): 左近樹（著）, 薮田ひかる,川村邦男,赤沼哲史,木賀大介,根本直人,古川善博,横堀伸一（編)
  • Total Pages: 312
  • Publisher: 朝倉書店
  • ISBN: 9784254160789