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3つのタイプIα超新星における恒星伴星とのエジェクト相互作用のシグネチャーはありません
Rob P Olling1, Richard Mushotzky1, Edward J Shaya1
1Astronomy Department, University of Maryland, College Park, Maryland 20742-2421, USA.
Nature
|May 22, 2015
まとめ
研究者らは,ケプラーミッションを使って3つのタイプIア超新星を観測した. 伴星との相互作用の証拠は見つかりませんでしたが,これらの超新星がおそらく白矮星の合併の結果であることを示唆しています.
科学分野:
- 天文学 (astronomy) 天文学 (astronomy) とは,天文学 (astronomy) とは,天文学 (astronomy) とは,天文学 (astronomy) とは
- 天体物理学 天体物理学
- コスモロジー・コスモロジーとは
背景:
- タイプIa超新星は,炭素/酸素白矮星における熱核爆発から発生する.
- 正確なトリガーメカニズムは議論の余地があります:同伴星からの増殖または白矮星の合併です.
- 超新星噴出物と同伴者の相互作用は,観測可能な明るさを引き起こすると予測されています.
研究 の 目的:
- Ia型超新星の祖先系を調査する.
- 伴星や環恒星物質とのエジェクト相互作用の証拠を探すために.
主な方法:
- ケプラーミッションからの高カデンスの (30分解像度) データを利用した.
- 3つの可能性の高いタイプIア超新星事件の光の曲線を分析した.
- 超新星噴出物と近くの物質の相互作用のシグネチャを探した.
主要な成果:
- 超新星噴出物と伴星との相互作用を示すサインは検出されなかった.
- 観測された光の曲線は,退化していない仲間との相互作用を含むモデルと矛盾しています.
結論:
- この発見は,バイナリ白矮星の合併を含む祖先モデルを裏付けている.
- ヘリウム恒星を含むような代替的なコンパクト星の合併も,データと一致しています.
- 相互作用シグネチャの欠如は,これらの超新星が比較的孤立したシステムまたは観測可能な信号を生成しないコンパクトな伴侶で起こったことを示唆しています.
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