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地球サイズの温和な惑星が 近くの超冷たい矮星を通過する
Michaël Gillon1, Emmanuël Jehin1, Susan M Lederer2
1Institut d'Astrophysique et de Géophysique, Université de Liège, Allée du 6 Août 19C, 4000 Liège, Belgium.
Nature
|May 3, 2016
まとめ
天文学者は地球サイズの3つの系外惑星を 超低温の矮星の周りを回っているところを発見しました これらの惑星は,恒星の近くで見つかりました
科学分野:
- 天文学と天体物理学
- 外惑星科学
- スター進化
背景:
- 超冷たい矮星は 恒星のような物体で 気温は2,700ケルビン以下です
- 低質量恒星や茶色矮星を含む太陽の近隣の天文物体の15%を占めています
- コア・アクレション理論は これらの天体周辺に 地球型惑星の有数の存在を予測している.
研究 の 目的:
- 超低温の矮星を周回する 地球の惑星を探し 特徴づけること
- 低質量星の周りの惑星形成理論の予測を テストするためです
- 超冷たい小惑星の 居住可能領域にある惑星の 居住可能性を調査する
主な方法:
- 観測天文学は,系外惑星を検出するためにトランジットフォトメトリーを使用する.
- 宿主の超冷たい矮星の赤外線光度と大きさの分析.
- 惑星の放射線レベルを決定する 星の特徴
主要な成果:
- 地球サイズの3つの惑星が 超冷たい矮星を通過している 12パーセック
- 内側の惑星は 地球の4倍と2倍の放射線を受け 居住可能なゾーンの内側にある
- 地球より放射能が低い3番目の惑星は,11の可能な軌道で示されています.
結論:
- この発見は 超冷たい小惑星の周りの 地球型惑星の存在を 確認しました
- 近くのシステムは 詳細な系外惑星大気の特徴づけに ユニークな機会を提供します
- 超低温の矮星は 居住可能な系外惑星の探求に 有望なターゲットです
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