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元赤い巨星の周りを回る小さな惑星のコンパクトなシステム
S Charpinet1, G Fontaine, P Brassard
1Université de Toulouse, UPS-OMP, IRAP, F-31400 Toulouse, France. stephane.charpinet@ast.obs-mip.fr
Nature
|December 24, 2011
まとめ
2つの地球サイズの惑星は,その赤い巨星によって飲み込まれて生き残り,非常に近い軌道を回っています. 生き残った惑星の核は,恒星の熱いB型亜矮星への進化に影響を与えたのかもしれません.
科学分野:
- 外惑星科学とは,外惑星科学のこと.
- 恒星の進化について
- 星の天体物理学 星の天体物理学
背景:
- 恒星に近い軌道 (<1AU) を回っている惑星は,恒星の赤い巨人相の間,包み込まれる.
- 以前の研究では,海湾に沈んだ後の巨大惑星と茶色矮星の生存が確認されたが,深層沈没の影響は不明であった.
研究 の 目的:
- 惑星が乱れることなく深赤の巨人の封筒を生き延びることができるかどうかを調査する.
- 飲み込まれた惑星が親星の進化に影響を与えるかどうかを判断する.
- レッド・ジャイアンスの後の恒星の周りの珍しい惑星体の報告.
主な方法:
- 観測天文学は,観測による天文学である.
- KIC 05807616.6の軌道パラメータと恒星特性の分析
主要な成果:
- 熱いB亜矮星KIC 05807616.6の周りを回っている,ほぼ地球サイズの2つの天体の発見
- これらの天体は,非常に近い距離 (0.0060と0.0076AU) で,短い周期 (5.76と8.23時間) で軌道を回っています.
- 遺体は,星の前赤色巨人の封筒の中に深く沈んで生き残った可能性が高い.
結論:
- これらの天体は,蒸発した巨大惑星の密集した核かもしれない.
- 熱いB亜矮星の形成を説明できるのは,それらの近接性と,質量損失における潜在的な役割である.
- このシナリオは,バイナリ系から発生しないホットB亜矮星についての説明を提供します.
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