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白い矮星を周回する木星の類型
J W Blackman1,2, J P Beaulieu3,4, D P Bennett5,6
1School of Natural Sciences, University of Tasmania, Hobart, Australia. joshua.blackman@utas.edu.au.
Nature
|October 14, 2021
まとめ
惑星が恒星の進化を 生き残る可能性があることを確認しました 惑星が恒星の進化を 生き残る可能性があることを確認しました この発見は多くの白矮星が 惑星の仲間を持っているという説を裏付けています
科学分野:
- 外惑星科学
- 星の進化について
- ホワイト・ダワーフ系
背景:
- 惑星の残骸は 恒星の進化から白矮星に 生存できますが 完ぺきな惑星は めったに検出されません
- シミュレーションによると 木星のような惑星は 太陽の8倍の質量の 恒星を周回する軌道で 生き残ることができます
- 白い矮星の周りの惑星の 観測確認は欠けています
研究 の 目的:
- 白い矮星の周りの惑星を 探査し特徴づけること
- 恒星の進化を通して惑星の存続を 観測的証拠として提供するためです
- 白い矮星の周りの惑星の 存在率に関する予測を検証するためです
主な方法:
- MOA-2010-BLG-477Lb マイクロレンズイベントのケック天文台からの近赤外線観測を利用した.
- 微小レンズデータを分析して 星系内の天体を見極める
- 白い矮星とその惑星の質量と軌道パラメータを決定した.
主要な成果:
- 白い矮星 (0.53 ± 0.11 太陽の質量) が確認された.
- 白い矮星を周回している木星質量 (1.4 ± 0.3 木星質量) の惑星が検出されました.
- この惑星は空平面で広い距離 (2.8 ± 0.5 天文単位) を有しており,大きな半大軸を暗示している.
結論:
- このシステムは,宿主星の進化の巨大と非対称的な巨大段階に生き残った惑星の最初の観測証拠を提供します.
- この発見は 理論上の予測を裏付けています 白い矮星の半分以上が 木星の惑星の仲間を持っているかもしれないと
- 発見されたシステムは太陽系と木星の将来の状態の アナログとして機能します
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