若い 超木星 の 炭素 に 富む 大気
Yapeng Zhang1, Ignas A G Snellen2, Alexander J Bohn1
1Leiden Observatory, Leiden University, Leiden, The Netherlands.
Nature
|July 15, 2021
まとめ
天文学者は,超木星TYC 8998-760-1 bの大気中に高い割合の炭素13を検出しました. この発見は 惑星が炭素一酸化物の 雪線を越えた 13C濃縮の氷から 形成された可能性を示唆しています
科学分野:
- 天文学と惑星科学
- 外惑星の大気
- 同位体地化学
背景:
- アイソトープの多量比は,太陽系の起源,恒星間化学,恒星核合成を理解するために重要である.
- 炭素同位体比は太陽系では一定であるが,星間媒質では異なる.
- 氷の分割や化学反応のようなプロセスは 原惑星円盤における炭素同位体の比率を変えることができます
研究 の 目的:
- 若い超木星TYC 8998-760-1 bの大気中の炭素同位体の比率を調査する.
- 惑星の大気成分が 太陽系や星間値から 逸脱しているかどうかを判断する
主な方法:
- TYC 8998-760-1 bの大気中の13COの観測
- 12CO/13CO比率を決定するためのスペクトルデータの分析.
- 大気温,化学組成,および校正の不確実性に対する疎外.
主要な成果:
- 6シグマ以上の統計的有意度で13COの検出
- 12CO/13CO比率 (90%の信頼度) が決定されました.
- これは,地上の値と局所的な恒星間値と比較して,13Cの有意な濃縮を示しています.
結論:
- 超木星TYC 8998-760-1 bは13Cでかなり濃縮されている.
- この惑星はCOの雪線を越えて位置しているので 13Cで濃縮された氷から炭素を蓄積したと考えられます
- これは,ガス巨星の形成経路と惑星の増殖における同位素分化の役割についての洞察を提供します.
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