エクソプラネット観測のためのスペクトログラフで,センチメートル/秒レベルで校正されています
Tobias Wilken1, Gaspare Lo Curto, Rafael A Probst
1Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Strasse 1, D-85748 Garching, Germany. tobias.wilken@mpq.mpg.de
Nature
|June 5, 2012
まとめ
レーザー周波数は,天文スペクトログラフの正確な校正を可能にします. この突破は,地球のような系外惑星の検出と,前例のない精度で宇宙加速の測定を可能にします.
科学分野:
- 天文学と天体物理学について
- 光学物理学 光学物理学
背景:
- 微妙な天文信号を検出するために,スペクトログラフの安定性は極めて重要です.
- 現在の校正方法は,放射速度測定で達成可能な精度を制限しています.
- レーザー周波数は,非常に安定して正確な光源を提供します.
研究 の 目的:
- レーザー周波数コンブを使用して天文スペクトログラフを校正する.
- 前例のない短期ドップラーシフトの再現性を達成するために.
- 地球のような系外惑星と宇宙加速を検出する可能性を実証する.
主な方法:
- 天文スペクトログラフの校正光源としてレーザー周波数を使用した.
- 半径速度測定のための絶対的な校正を達成しました.
- 恒星HD75289を監視し,惑星の軌道を再計算した.
主要な成果:
- 2.5cm s(-1) の短期ドップラーシフトの再現性を実証しました.
- 惑星が恒星HD 75289.9の周りを回る軌道を成功裏に再調整しました.
- 達成された精度は,スペクトログラフの校正における以前の制限を超えています.
結論:
- レーザー周波数の校正により,スペクトログラフの安定性と精度が大幅に向上します.
- この技術は,地球質量の系外惑星を居住可能なゾーンで検出する道を開きます.
- 精密な放射速度モニタリングを通じて,宇宙加速の直接測定を可能にします.
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