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幼星 の 周りの 歪んだ 円盤
Nami Sakai1, Tomoyuki Hanawa2, Yichen Zhang3
1RIKEN Cluster for Pioneering Research, Saitama, Japan. nami.sakai@riken.jp.
Nature
|January 2, 2019
まとめ
IRAS 04368+2557で 歪んだ原星円盤を観測したので 惑星は誕生時から 軌道が整っていない状態で 形成される可能性が示唆されています この歪んだ構造は 蓄積や磁場不整合によるものです
科学分野:
- 天文学
- 天体物理学
- 外惑星科学
背景:
- エクソプラネットの軌道平面は 恒星の赤道と一致していないことが多いのです
- 重力散乱や 恒星との出会いや 誕生盤の歪みによるものです
- 歪んだ円盤の構造は後期段階では知られていますが,初期の原星進化では知られていません.
研究 の 目的:
- 外惑星系における軌道不整合の起源を調査する.
- プロトステラディスクが進化の初期段階で歪められるかどうかを判断する.
- IRAS 04368+2557周辺の原星円盤の構造を分析する.
主な方法:
- ミリメートルの波長で 塵の連続観測
- L1527原星核に埋め込まれた若い原星IRAS 04368+2557の分析.
- 円盤の形状と軌道平面の検査
主要な成果:
- IRAS 04368+2557の周りに曲がりくねった円盤が観測されました.
- 内側と外側の円盤は わずかに異なる軌道平面を示しています
- 他の情報源の証拠は見つかりませんでした
結論:
- 歪んだ円盤の構造は 後の相互作用によるものではなく 生まれながらのものです
- 可能性のある原因には,アニゾトロピック増量または磁場不整合が含まれます.
- これは,惑星が誕生から軌道に不一致で形成されるという仮説を裏付けます.
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