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Updated: Jul 28, 2026

11:20
Investigation of Early Plasma Evolution Induced by Ultrashort Laser Pulses
Published on: July 2, 2012
アシンメトリックなエネルギー型Ic超新星が軸外で見られ,ガンマ線爆発へのリンクがある
Paolo A Mazzali1, Koji S Kawabata, Keiichi Maeda
1Department of Astronomy, School of Science, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan. mazzali@ts.astro.it
まとめ
タイプIcの超新星爆発は,ガンマ線爆発と関連しています. 超新星SN 2003jdの新たな観測は,その爆発が非球形であったことを明らかにし,非対称な超新星に対する直接的な証拠を提供している.
科学分野:
- 天文学と天体物理学について
- 超新星とガンマ線爆発
背景:
- タイプIc超新星は,水素とヘリウムの封筒が欠けている巨大な恒星の核崩壊の結果である.
- これらの超新星は,長時間のガンマ線爆発 (GRBs) と関連しているため,特に興味があります.
- 以前の兆候は,アスフィアの爆発を示唆したが,直接的な証拠は欠けていた.
研究 の 目的:
- タイプIcの超新星爆発の非球体的な性質の直接的な証拠を提供するために.
- 超新星SN 2003jdの最近の観測を分析し,その爆発幾何学を理解するために.
- SN 2003jdとガンマ線爆発の潜在的な関連性を調査する.
主な方法:
- 超新星SN 2003jdのスペクトル観測をスバルとケック望遠鏡で利用した.
- 中性酸素とマグネシウムの星雲線を分析して,プロフィール特性を調べました.
- 観測されたスペクトルプロフィールをモデル化し,爆発の幾何学を推論した.
主要な成果:
- SN 2003jd.における中性酸素とマグネシウムの nebular 線における二重ピークプロファイルが観察されました.
- これらのプロファイルは,GRBがあるか否か,他の既知のタイプIc超新星と著しく異なる.
- 観測されたプロファイルは,赤道平面の近くから見たアスフェリック,軸対称爆発と一致しています.
結論:
- 超新星SN 2003jdは,Ic型超新星におけるアスフェリック爆発の直接的な証拠を提供します.
- 観測された非対称性は,核崩壊超新星モデルを支持する.
- GRBと関連している場合,爆発は地球から遠ざかっている可能性が高い.
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