A02 Elucidation of the chemical environment during the formation of the solar system

By combining precise analysis of extraterrestrial organic matter with replicated experiments, we will try to elucidate the initial chemical state at the time of the formation of the solar system. We will conduct comprehensive analyses of meteorites of asteroidal origin, interplanetary dust thought to have originated from comets, and organic matter in samples of the C-type asteroid Ryuguu brought back by the Hayabusa2 spacecraft to determine elemental (carbon, hydrogen, oxygen, nitrogen, and sulfur) and isotopic compositions, molecular structures, and so on. These organics were formed during the formation of the primitive solar system disk, and then transformed by heat, light, and water in the primitive solar system disk and small bodies to their current chemical state. From the minerals that coexist with extraterrestrial organics, we can infer the transformation processes that these organics went through, and constrain the chemical state (elemental composition, molecular structure, isotopes, and physical properties) of the early solar system organics before their transformation. We will conduct photochemical organic matter formation experiments simulating the irradiation of interstellar ices, as well as organic matter and silicate transformation experiments under protoplanetary disk and small body conditions, in order to constrain the chemical state (elemental composition, molecular structure, isotopes, and physical properties) of the first organic matter in the solar system before transformation. In particular, we will investigate the molecular species and their abundance ratios, which are known to be diverse in observations of the formation regions of planetary systems. In collaboration with the observation and theory groups, we will place the chemical processes in the early solar system and the chemical environment at the time of solar system formation in the diverse chemistry of the planet-forming region.

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A02 Project Group Leader :

Shogo Tachibana

Professor,

Institute of Space and Planetary Science

Graduate School of Science,

The University of Tokyo

橘 省吾
Shogo Tachibana

University of Tokyo

Group Leader, photochemical experiment, transformation experiment

薮田 ひかる
Hikaru Yabuta

Hiroshima University

Structural analysis of experimental and extraterrestrial samples

奈良岡 浩
Hiroshi Naraoka

Kyushu University

Elemental analysis of experimental samples and extraterrestrial samples

岡崎 隆司
Ryuji Okazaki

Kyushu University

Analysis of volatile components in experimental and extraterrestrial samples

圦本 尚義
Hisayoshi Yurimoto

Hokkaido University

Isotope analysis of experimental and extraterrestrial samples

松本 恵
Megumi Matsumoto

Tohoku University

Microstructural observation of experimental samples and extraterrestrial samples

瀧川 晶
Aki Takigawa

University of Tokyo

Photochemical and transformation experiments

大場 康弘
Yasuhiro Oba

Hokkaido University

[The 1st Public Research Leader]
"Interstellar Molecular Clouds and the Molecular Evolution of the Solar System Linked by Hexamethylenetetramine"

野口 高明
Takaaki Noguchi

Kyoto University

[The 1st Public Research Leader]
"Secondary minerals and organic matter from asteroid Ryugu: Interactions during water metamorphism and effects of solar wind irradiation"

松本 徹
Toru Matsumoto

Kyushu University

[The 1st Public Research Leader]
"Understanding the Unique Evolution of Organic Matter on the Surface of Asteroid Ryugu"

成島 哲也
Tetsuya Narushima

Institute for Molecular Science

[The 1st Public Research Leader]
"Chiral molecular science of interstellar dust nanoparticles by polarized near-field"

林 佑
Tasuku Hayashi

Japan Aerospace Exploration Agency

[The 1st Public Research Leader]
"Research on Next Generation X-ray Spectroscopy Detectors for Ultra-Precise Quantitative Analysis"