PDS 70円盤の地上の惑星形成地帯の水
G Perotti1, V Christiaens2, Th Henning3
1Max Planck Institute for Astronomy, Heidelberg, Germany. perotti@mpia.de.
Nature
|July 24, 2023
まとめ
JWST の観測で PDS 70 システムの内部の円盤に水が検出されました. この発見は,地上の惑星が水にアクセスし,その場で形成された可能性を示唆しています.
科学分野:
- 惑星科学
- 天体物理学
- 天体化学
背景:
- 地上の惑星と亜海王星は,内部原惑星円盤 (<10AU) で形成される.
- 惑星の形成における水の役割は重要ですが,その起源 (in situ vs. 輸送) は議論されています.
- 前回の観測 (スピッツァー) は,内部の円盤の水分の上限だけを示した.
研究 の 目的:
- JWSTを使って PDS 70 システムの内部ディスクで水を探します
- 内部の円盤で地上の惑星の形成のための水の起源と利用可能性を調査する.
- 水の存在に影響を与える化学的プロセスと円盤のダイナミクスを理解する.
主な方法:
- ジェームズ・ウェッブ宇宙望遠鏡 (JWST) の PDS 70 原惑星円盤の観測を活用した.
- 中赤外線のスペクトルエネルギー分布を分析して 分子種を検出した
- 水蒸気の密度と二酸化炭素の排出量を測定した.
主要な成果:
- PDS70の内部盤に水があることが確認されました
- 水柱の密度は,O,H2,および/またはOHの反応によって,自己遮断を生き残る in-situ 形成を示唆しています.
- 観測されたCO2排出は,in-situ形成とUV光解離耐性を支持する.変数SEDは,内部ディスクの幾何学的変化を示す.
結論:
- PDS 70の内部の惑星の形成は,水の貯蔵庫にアクセスできます.
- 塵の遮断と外部の円盤の補充によって潜在的に支援される,インシトゥの水形成がサポートされます.
- 変数スペクトルエネルギー分布は 内盤の幾何学的な変化を示唆している.
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