土星で観測された脱塩メタン

U Fink, H P Larson

Science (New York, N.Y.)

|July 28, 1978

まとめ

研究者らは土星の大気中にデュテリアスメタン (CH3D) を検出し,デュテリアムと水素の比率が木星に匹敵することを明らかにした. この発見は,初期の太陽系の組成に関する洞察を提供します.

科学分野:

惑星科学は惑星科学である.
スペクトル顕微鏡検査です.
大気化学大気化学

背景:

脱硫メタン (CH3D) は,惑星の大気の研究における重要なトレーサーである.
以前の研究では,太陽系の様々な天体でデュテリウムと水素の比率を確立しました.

研究の目的:

土星の大気中のCH(3) Dの豊富さを決定するために.
土星のデウテリウムと水素の比率を計算する.
土星のデウテリウムの豊富さを他の太陽系天体と比較するために.

主な方法:

フーリエ変換スペクトロメーターを用いた土星の5ミクロンスペクトルの観測.
CH(3) D. のV(2) 帯の吸収特性の分析

主要な成果:

CH(3) Dの豊富さは,2.6 +/- 0.8cm-amagat.で測定されました.
平均光譜線形成レベル温度は175 +/- 30Kと決定されました.
土星の大気中のデウテリウムと水素の比率は約2×10−5であることが判明した.

結論:

土星の大気温は,5ミクロンの窓で,大気圏の奥深くから発する熱放射線を示唆しています.
土星のデウテリウムと水素の比率は,木星と同等だが,地球より低い.
この比率は,初期の太陽系の原始的なデウテリウムと水素の比率を表しているのかもしれない.

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