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恒星円盤系にある若い巨大な惑星
J Setiawan1, Th Henning, R Launhardt
1Max-Planck-Institut für Astronomie, Heidelberg, D-69117, Germany.
Nature
|January 4, 2008
まとめ
天文学者は,若い恒星TW Hydraeの周りを回る惑星を発見し,惑星の形成は1000万年以内に起こる可能性があることを示しました. この発見は,原惑星円盤が消散する前に惑星系の発達を理解するために極めて重要です.
科学分野:
- 惑星外科学とは,惑星外科学です.
- 恒星および亜恒星物体研究研究
- 天体生物学と天体誕生について
背景:
- 惑星の形成は,若い恒星を囲む原惑星円盤の中で発生すると理解されています.
- 惑星の形成の正確な時間スケールとメカニズムは,特に非常に若い恒星の周りに,活発な研究と議論の対象であり続けています.
- これまでに,原惑星円盤が活発に形成されている恒星の周りに惑星が検出されていなかったため,初期の惑星系進化の理解にギャップを残していた.
研究 の 目的:
- 非常に若い恒星の周りの惑星形成の可能性を調査する.
- 原惑星円盤相内の惑星を検知し,特徴づけること.
- 円盤進化の文脈で惑星形成の時間尺度を制限する.
主な方法:
- よく特徴づけられた原惑星円盤を持っていることが知られている若い恒星TW Hydraeの観測と分析.
- 放射速度測定またはトランジットフォトメトリー (抽象で詳細に記載されていない特定の方法) による惑星の伴侶の検出.
- 惑星の質量と軌道パラメータの特徴.
主要な成果:
- 質量 (9.8+/-3.3) の木星質量を持つ惑星が,TW Hydraeの周りを回っているのが検出されました.
- この惑星は,0.04 AUの近距離で軌道を回り,周期は3.56 日です.
- 検出された惑星は,TW Hydraeの原惑星円盤の内縁に位置しています.
結論:
- 惑星は1000万年以内に形成され,これは以前に制限されていたよりもかなり短い時間スケールです.
- 惑星の形成は,原惑星円盤が恒星の風と放射線によって完全に消去される前にさえ可能である.
- この発見は,初期の惑星形成の直接的な証拠を提供し,惑星系の起源に関する私たちの理解を豊かにします.
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