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WASP-12bは,潮の消去による膨張し,膨張し,破壊する惑星です
Shu-Lin Li1, N Miller, Douglas N C Lin
1Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing 100871, China.
Nature
|February 26, 2010
まとめ
WASP-12bのような木星の質量のエキゾチックな系外惑星は,恒星と非常に近い軌道に回り,質量を失っています. 潮力はこれらの惑星を歪め,膨張させ,恒星の周りにガスの円盤を形成する可能性があります.
科学分野:
- 惑星外科学とは,惑星外科学です.
- 天体物理学 天体物理学
- 惑星のダイナミクス
背景:
- 恒星に近い軌道 (ホット・ジュピター) を回る木星質量系外惑星は予想外でした.
- WASP-12bは,木星の質量1.4分の1の質量を持つ通過惑星で,周期1.1日で3.1の恒星半径で軌道を回っています.
- その大きな半径と非円形の軌道は,そのような近接性には驚くべきものです.
研究 の 目的:
- 外惑星WASP-12b.の性質を分析する.
- 近くにある巨大な系外惑星に影響を与える物理的プロセスを理解するために.
- WASP-12b.の質量損失と軌道動態を調査する.
主な方法:
- WASP-12b.の観測データの分析
- 潮力とその惑星構造への影響のモデリング.
- 惑星の形状を考慮した光の曲線分析.
主要な成果:
- WASP-12bは,恒星に対して毎年10~7の木星の質量の質量を失っている.
- 惑星の形状は,強烈な恒星の重力によって歪められている.
- 光の曲線は球形の惑星と約10%異なる.
結論:
- 惑星のコンベクティブ・エンベロープにおける潮の消去は,その大きな体積を動かす.
- 剥離された惑星物質のガスの円盤が宿主星を囲んでいるかもしれません.
- 共鳴する超地球が存在し,WASP-12bの軌道を混乱させ,その偏心性を維持する可能性がある.
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