彗星Hyakutakeの赤外線スペクトルでアセチレンが検出されました

T Y Brooke¹, A T Tokunaga, H A Weaver

¹Jet Propulsion Laboratory, Pasadena, California 91109, USA.

Nature

|October 17, 1996

まとめ

彗星には水やその他の揮発性物質が豊富に含まれています. ハヤクタケ彗星のアセチレン (C2H2) の検出は,彗星の氷が初期の太陽星雲ではなく,星間粒から発生した可能性があることを示唆しています.

科学分野:

天文学と天体物理学について
惑星科学惑星科学
アストロケミストリーアストロケミストリー

背景:

彗星は,太陽系初期からの揮発性物質の重要な貯蔵庫です.
彗星の揮発性成分を理解することは,太陽系形成モデルを決定するために重要です.
水分子は彗星の揮発性物質の約80%を占めています.

研究の目的:

彗星の揮発性種を特定し,定量化するために.
彗星物質の化学組成を分析することによって彗星物質の起源を調査する.
彗星の形成理論を検証し,星間星雲と太陽星雲の起源を区別する.

主な方法:

赤外線スペクトロスコピーは,彗星C/1996 B2 (Hyakutake) の組成を分析するために使用されました.
アセチレン (C2H2) などの特定の揮発性分子の検出と豊富な推定.

主要な成果:

アセチレン (C2H2) は,Hyakutake彗星の赤外線スペクトルで検出されました.
アセチレンと水の比重は0.3%から0.9%と推定された.

結論:

ハヤクタケ彗星のアセチレン濃度測定は,冷たい恒星間雲の予想された濃度と比較できます.
これらの発見は,彗星の揮発性物質は,氷で覆われた恒星間粒から発生する可能性があるという仮説を支持する.
この結果は,彗星の形成に原始的な恒星間物質が有意に寄与していることを示唆している.

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