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冥王星 と カーロン の 衝突 クレーター は,カイパー ベルト の 小物体 が 欠け て いる こと を 示し て い ます
Science (New York, N.Y.)
|March 2, 2019
まとめ
予想より少ない小さな衝突クレーターを 発見しました これは,初期の太陽系における小さなカイパーベルトオブジェクト (KBO) の驚くべき希少性を示唆しています.
科学分野:
- 惑星科学
- 太陽系探査
- カイパーベルトの研究
背景:
- 冥王星とハロンの横を通過した ニュー・ホライゾンズ号は その表面の見事な景色を 見せてくれました
- これらの表面は衝突クレーターによって特徴付けられ,それらを形成したカイパーベルトオブジェクト (KBO) についての手がかりを提供します.
研究 の 目的:
- 冥王星とハロンの衝突クレーターの 大きさと頻度の分布を分析する
- 初期の太陽系における小さなカイパーベルトオブジェクト (KBO) の集団をクレーター記録に基づいて推論する.
主な方法:
- ニュー・ホライズンスの高解像度画像の分析
- 冥王星とハロンの表面のクレーター数と大きさ-周波数分布解析.
- 観測されたクレーター形成と予想されるインパクター集団の比較.
主要な成果:
- 小型の衝突クレーター (直径約13キロメートル未満) の顕著な欠如が観察されました.
- この小さなクレーターの不足は 地質学的再表面化プロセスにのみ 起因するものではありません
- この発見は,直径が1〜2キロメートルと推定される小さなカイパーベルトオブジェクト (KBO) の有意な不足を示しています.
結論:
- 冥王星とハロンの古代表面のクレーター記録は,以前より小さなKBOの豊富さを示唆しています.
- これは初期の太陽系には 予想よりも小さな天体が少なかったことを示唆している.
- このクレーター記録は,初期太陽系におけるKBOの大きさ-周波数分布を理解するために重要なデータを提供します.
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