アムニウム 塩 は,彗星 の 核 や 恐らく 幾つ か の 小惑星 に ある 窒素 の 貯蔵 庫 です
Olivier Poch1, Istiqomah Istiqomah2, Eric Quirico2
1Université Grenoble Alpes, Centre National de la Recherche Scientifique (CNRS), Institut de Planétologie et d'Astrophysique de Grenoble (IPAG), 38000 Grenoble, France. olivier.poch@univ-grenoble-alpes.fr.
まとめ
67P/Churyumov-Gerasimenko彗星には,窒素と炭素の比率の不一致を解決するアンモニア塩の形で重要な窒素が含まれています. これらの塩は,彗星と小惑星を組成的に結びつける主要な窒素貯蔵庫です.
科学分野:
- 惑星科学
- 天体化学
- 彗星科学
背景:
- 彗星の窒素と炭素 (N/C) の比率は太陽より低く,窒素貯蔵庫が欠けていることを示唆している.
- 彗星67P/チュリュモフ・ゲラシメンコは,その核に約3.2マイクロメートルのユニークなスペクトル特徴を示しています.
研究 の 目的:
- 彗星67P/Churyumov-Gerasimenkoの 未確認のスペクトル特徴の源を特定する
- 彗星の潜在的窒素貯蔵庫としてのこの特徴の役割を決定する.
主な方法:
- 彗星の表面条件をシミュレートする実験室での実験
- 彗星67P/チュリュモフ・ゲラシメンコからの光スペクトルの反射率の分析.
- 彗星のスペクトル特徴と小惑星のスペクトルの比較
主要な成果:
- 3.2ミクロメートルの吸収帯は,粉塵と混合したアンモニア塩に起因する.
- アンモニアム塩は,彗星67Pの窒素貯蔵庫を大きく占め,他の窒素含有化合物を上回る可能性がある.
- 同様のスペクトルの特徴は,いくつかの小惑星で観察されています.
結論:
- アンモニアム塩は,彗星67P/チュリュモフ・ゲラシメンコの重要な窒素貯蔵庫として特定されています.
- この発見は,彗星における観測されたN/C比の不一致を調和させるのに役立ちます.
- アンモニアム塩の存在は彗星,小惑星,星間媒体の間の組成のリンクを示唆しています.
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