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DEUTERIUM FRACTIONATION DURING AMINO ACID FORMATION BY PHOTOLYSIS OF INTERSTELLAR ICE ANALOGS CONTAINING DEUTERATED METHANOL

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タイトル: DEUTERIUM FRACTIONATION DURING AMINO ACID FORMATION BY PHOTOLYSIS OF INTERSTELLAR ICE ANALOGS CONTAINING DEUTERATED METHANOL
著者: Oba, Yasuhiro 著作を一覧する
Takano, Yoshinori 著作を一覧する
Watanabe, Naoki 著作を一覧する
Kouchi, Akira 著作を一覧する
キーワード: astrochemistry
ISM: clouds
ISM: molecules
ultraviolet: ISM
発行日: 2016年 8月10日
出版者: IOP Publishing
誌名: Astrophysical journal letters
巻: 827
号: 1
開始ページ: L18
出版社 DOI: 10.3847/2041-8205/827/1/L18
抄録: Deuterium (D) atoms in interstellar deuterated methanol might be distributed into complex organic molecules through molecular evolution by photochemical reactions in interstellar grains. In this study, we use a state-of-the-art high-resolution mass spectrometer coupled with a high-performance liquid chromatography system to quantitatively analyze amino acids and their deuterated isotopologues formed by the photolysis of interstellar ice analogs containing singly deuterated methanol CH2DOH at 10 K. Five amino acids (glycine, alpha-alanine, beta-alanine, sarcosine, and serine) and their deuterated isotopologues whose D atoms are bound to carbon atoms are detected in organic residues formed by photolysis followed by warming up to room temperature. The abundances of singly deuterated amino acids are in the range of 0.3-1.1 relative to each nondeuterated counterpart, and the relative abundances of doubly and triply deuterated species decrease with an increasing number of D atoms in a molecule. The abundances of amino acids increase by a factor of more than five upon the hydrolysis of the organic residues, leading to decreases in the relative abundances of deuterated species for alpha-alanine and beta-alanine. On the other hand, the relative abundances of the deuterated isotopologues of the other three amino acids did not decrease upon hydrolysis, indicating different formation mechanisms of these two groups upon hydrolysis. The present study facilitates both qualitative and quantitative evaluations of D fractionation during molecular evolution in the interstellar medium.
資料タイプ: article (author version)
URI: http://hdl.handle.net/2115/67010
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 大場 康弘

 

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