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銀河系の乱れによって惑星系が破壊され,広い二重星が破壊される.
Nathan A Kaib1, Sean N Raymond, Martin Duncan
1Department of Physics, Queen's University, Kingston, Ontario K7L 3N6, Canada. nkaib@astro.queensu.ca
Nature
|January 8, 2013
まとめ
惑星の遠い仲間である広い二重星は,数十億年にわたって惑星系を大幅に変化させることができます. これらのシステムは,しばしば惑星を放出し,他の惑星の偏心性を高めます.
科学分野:
- エクソプラネット科学 エクソプラネット科学
- 天体物理学 天体物理学
- コンピューティング天体物理学
背景:
- 多くの系外惑星は,1,000AU以上の距離の広い二重星系に存在しています.
- 惑星の進化にこれらの遠い仲間が与える影響は十分に研究されていない.
- 広い二重軌道はダイナミックで,銀河の潮や恒星との出会いによって影響を受けます.
研究 の 目的:
- 惑星系進化に広大な二重伴星が及ぼす影響を調査する.
- ダイナミックな幅のバイナリー軌道が,系外惑星系を再構成する方法を理解する.
- 広い二重星系にある惑星の軌道特性を,孤立した星と比較するために.
主な方法:
- 惑星系の数値シミュレーションを,広い二進体構成で行う.
- 異なるバイナリダイナミクスの下で惑星の軌道の長期的な進化をモデリングする.
- 模擬および観測された系外惑星の特異性の統計分析.
主要な成果:
- 広い二重相伴星は,惑星系を劇的に改造することができ,しばしば形成後数十億年です.
- 惑星の放出や軌道離心率の上昇は,一般的な結果である.
- 広い二重星系にある巨大系外惑星は,孤立した恒星を囲む系外惑星よりも統計的に高い特異性を示しています.
結論:
- 以前の仮定に反して,広い二重伴星は惑星系を活発に混乱させる.
- 観測された偏心分布は,初期の惑星系の類似性を示唆し,広い二重星は後に外惑星を散らばった.
- ほとんどの孤立した巨大系外惑星系には,検出されていない遠い惑星が宿っている可能性が高い.
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