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低質量系外惑星の探査は,高拡大で重力マイクロレンズを用いて行われます
1Solar Terrestrial Environment Laboratory, Nagoya University, Nagoya 464-01, Japan.
Science (New York, N.Y.)
|August 31, 2004
まとめ
この研究では,重力マイクロレンズを使用して,系外惑星の探査を行いました. 惑星は検出されなかったが,遠方の恒星の周りを回る惑星を除外する新記録を樹立した.
科学分野:
- * 天文学と天体物理学
- * エクソプラネット検出
- * 引力マイクロレンズ
背景:
- *MOA 2003-BLG-32/OGLE 2003-BLG-219重力マイクロレンズイベントは,系外惑星検出のためのユニークな機会を提供しました.
- *ピーク拡大は500を超え,記録された最高値であり,敏感な観測が可能になりました.
研究 の 目的:
- * MOA 2003-BLG-32/OGLE 2003-BLG-219 イベント中にレンズ星を周回する惑星の敏感な検索を行う.
- * 軌道距離の広い範囲内の系外惑星の存在に新しい限界を設定する.
主な方法:
- * マイクロレンズ発生のピークマグニフィケーションの周りの連続したフォトメトリック観測.
- * 惑星による異常を検出するために,光線曲線データを分析する.
主要な成果:
- * レンズ星の周りを回る系外惑星は検出されなかった.
- * 2.3-3.6AUから地球質量 (1.3x) の惑星を除外.
- *0.9-8.7AUから天王星の質量の惑星を除外.
- * 除外された土星質量惑星 (1.3x) 0.2-60AU.
結論:
- * この研究は,これまでのところ,どの恒星も周りの系外惑星の検出に最も高い感度領域を達成した.
- *重力マイクロレンズは,系外惑星の個体数を発見し,制限するための強力な技術です.
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