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超新星1993Jの祖先である巨大バイナリー伴星である
Justyn R Maund1, Stephen J Smartt, Rolf P Kudritzki
1Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK. jrm@ast.cam.ac.uk
Nature
|January 9, 2004
まとめ
超新星SN1993Jの10年後,天文学者は,その巨大な二重伴星を検出しました. この発見は,先祖星が同伴星に水素の封筒を失っていたことを確認し,超新星を説明しています.
科学分野:
- 天文学と天体物理学について
- 恒星の進化について
- 超新星とは,超新星です.
背景:
- 超新星 (SN) 1993Jは,当初,水素に富んだタイプIIとして分類され,水素欠乏型のタイプIBに変換されました.
- 爆発前の観測により,SN 1993Jの祖先は,巨大な伴星または若い恒星連合の赤い超巨大星であったことが示唆されました.
- モデルによると,SN 1993JはIIb型超新星であり,二重相伴星への質量移転の結果であったが,この相伴星は未発見のままだった.
研究 の 目的:
- 超新星 (SN) 1993Jの祖先である難解な巨大な伴星を特定するために.
- SN 1993Jのユニークなスペクトル進化につながる質量喪失プロセスにおける二重伴星の役割を確認する.
- タイプIIb超新星におけるバイナリコンパニオン仮説の観測証拠を提供するため.
主な方法:
- 爆発から10年後のSN 1993Jのフォトメトリックとスペクトロスコピーの観測を行った.
- 超新星の位置における恒星のサインを検知し特徴づけるためにデータを分析した.
- 超新星残骸の近くの淡い物体を解明するために,高度な画像技術を使用した.
主要な成果:
- 消えた超新星SN 1993Jの場所にある巨大な星の明確なサインを検出しました.
- 超新星の祖先のバイナリー伴星の存在が確認されました.
- 検出された伴星は,バイナリ相互作用モデルの直接的な証拠を提供します.
結論:
- 検出された巨大な恒星は,祖先の水素封筒を剥がす責任を持つ二重伴星である.
- この発見は,IIb型超新星の祖先に,巨大な伴星が存在するという最初の直接的な証拠を提供します.
- この発見は,SN 1993Jの性質とその祖先系に関する長年の謎を解明した.
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