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最も明るい赤矮星 GJ 887 を周回する超地球の多惑星系
S V Jeffers1, S Dreizler2, J R Barnes3
1Institut für Astrophysik, Georg-August-UniversitÄt, 37077 Göttingen, Germany. sandrajeffers.astro@gmail.com.
まとめ
天文学者は赤い矮星GJ887の周りを回る 超地球型系外惑星の 複数惑星系を発見しました これらの惑星は 居住可能な領域に近いので 将来の研究に ワクワクする可能性を秘めています
科学分野:
- 外惑星科学
- 星の天体物理学
- 天体生物学
背景:
- 太陽系外の惑星 (系外惑星) の探求は,惑星の形成と他の場所での生命の可能性を理解するために不可欠です.
- 近隣の惑星系は 詳細な系外惑星の特徴を 示す主要なターゲットです
- 赤色矮星は系外惑星の宿主ですが その活動レベルは 居住可能性に問題をもたらす可能性があります
研究 の 目的:
- 近くの赤矮星GJ887の周りを 周回する系外惑星を発見し 特徴づけること
- 新しく発見された系外惑星の 居住可能性を評価するためです
- GJ887の恒星活動を調査する
主な方法:
- 軌道上の惑星によって引き起こされる宿主星の微妙な重力振動を検出するために 放射速度測定を用いた.
- 光測定データを分析して 恒星の変動を決定した
- 軌道パラメータと仮定されたアルベドに基づいて計算された均衡温度.
主要な成果:
- GJ 887の軌道周りを9.3日と21.8日の2つの超地球系外惑星を発見しました.
- この21.8日間の惑星は 約350ケルビンの平衡温度で 液体水居住可能なゾーンの内側に位置しています
- 未確認の信号が検出されました 3つ目のスーパーアースの可能性を示唆しています 周期は50日程度で おそらくより温和な軌道を回っています GJ887は異常な低光度変動 (<500ppm) を表している.
結論:
- GJ 887は,少なくとも2つの惑星が居住可能なゾーンの近くにある,超地球のコンパクトな多惑星系をホストしています.
- GJ 887の低い恒星活動は,その惑星系を将来の大気研究と居住可能性の評価のための有望なターゲットにしています.
- この発見により 赤色矮星は 潜在的に居住可能な系外惑星の宿主として 注目されるようになりました
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