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彗星ヘイル・ボップ (C/1995 O1) の放出ガスの進化は,ラジオ観測から得られた
N Biver1, D Bockelée-Morvan, P Colom
1Observatoire de Paris-Meudon, F-92195 Meudon, France.
Science (New York, N.Y.)
|March 28, 1997
まとめ
ヘール・ボップ彗星は,太陽に近づくにつれて様々なガスを放出しました. 氷の粒から水 (H2O) の昇華が観察され,コマは一酸化炭素 (CO) 駆動からH2O駆動へと変化した.
科学分野:
- 彗星科学は彗星科学である.
- ラジオ天文学 ラジオ天文学
- 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,初期の太陽系についての洞察を与えてくれます.
- 彗星からの放出ガスを理解することは,惑星科学にとって極めて重要です.
研究 の 目的:
- ヘール・ボップ彗星によって放出されたガスの組成を分析するために.
- 揮発性生物種と太陽からの距離との関係を調査する.
- 彗星の昏睡組成の要因を特定するために.
主な方法:
- 地上無線望遠鏡を用いたヘイル・ボップ彗星の光譜分析.
- 異なる太陽距離 (6.9〜1.4AU) で彗星のコマ組成の観測.
主要な成果:
- CO,CH3OH,HCN,H2O,H2S,CS,H2CO,CH3CN,HNCを含むガスの漸進的な放出である.
- より揮発性のある種は,太陽から遠く離れたところでは豊富でしたが,揮発性との直接的な相関はありませんでした.
- 3.5AUを超えて観察された氷の粒からH2Oの昇華の証拠.
- COによる昏睡状態からH2Oによる昏睡状態への移行は,約3AUで起こった.
- 彗星が太陽に近づくにつれて,ガス流出速度と温度が増加した.
結論:
- ヘール・ボップ彗星の昏睡組成は,太陽に近づくにつれて著しく進化した.
- 太陽放射線は彗星からの放出ガスを駆動し,昏睡のダイナミクスに影響を与えます.
- この研究は,彗星における亜鉛化プロセスと揮発性放出に関する詳細な洞察を提供します.
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