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束縛されていないまたは広大な軌道にある木星質量惑星の大きな集団はありません
Przemek Mróz1, Andrzej Udalski1, Jan Skowron1
1Warsaw University Observatory, Aleje Ujazdowskie 4, 00-478 Warsaw, Poland.
Nature
|July 25, 2017
まとめ
重力マイクロレンズ調査は 木星の質量に匹敵する 浮遊惑星は見つかりませんでした この研究は以前考えられていたよりも 自由に浮遊する惑星が少ないことを示唆していますが 地球質量の自由に浮遊する惑星の存在を暗示しています
科学分野:
- 天文学と天体物理学
- 外惑星科学
背景:
- 惑星の形成理論は 惑星が システムから解き放たれることを示唆しています
- 重力マイクロレンズを用いた以前の研究は,自由に浮遊する木星質量惑星の多さを示した.
- 現存する赤外線観測は 低質量自由浮遊物体の検出に限られています
研究 の 目的:
- 重力マイクロレンズイベントのより大きなデータセットを使用して,自由浮遊惑星の集団を調査します.
- フリーフローティングの惑星による 短時間の微小レンズ現象の 過剰な発見を検証する
- 木星の質量や 質量が低い惑星の 浮遊頻度を制限するためです
主な方法:
- 2010年から2015年までの重力マイクロレンズ現象の大量サンプル (以前の6倍) の分析.
- 短時間のマイクロレンズ現象を検出するために特別に設計された高感度調査.
- レンズ化した物体の質量を推測するためのイベント時間スケールの特徴付け.
主要な成果:
- 1~2日間の微小レンズ発現の過剰は検出されず,以前の発見と矛盾していた.
- メインシーケンス恒星ごとに,木星質量0.25の自由浮遊または広軌道惑星の 95%の上限が確立されました.
- いくつかの可能な超短時間のイベント (<0.5日) が観測され,地球質量または超地球質量の自由浮遊惑星の存在を潜在的に示した.
結論:
- フリーフローティングの木星質量惑星の数は,以前のマイクロレンズ研究によって示唆されたよりも少ないようです.
- 観測されたデータは fewer ejected giant planets を予測する惑星形成理論と よりよく一致しています
- 超短時間の出来事の検出は 低質量自由浮遊惑星の形成に関する理論を支持します
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