天文学について ASASSN-15lh: 超明るさの超新星
Subo Dong1, B J Shappee2, J L Prieto3
1Kavli Institute for Astronomy and Astrophysics, Peking University, Yi He Yuan Road 5, Hai Dian District, Beijing 100871, China. dongsubo@pku.edu.cn.
Science (New York, N.Y.)
|January 28, 2016
まとめ
天文学者は,これまでに観測された中で最も明るい超新星 (SN) であるASASSN-15lhを発見した. この非常に明るいイベントは,超輝かしい超新星 (SLSNe-I) とその起源に関する現在のモデルに挑戦しています.
科学分野:
- 天文学
- 天体物理学
- 宇宙学
背景:
- 超明るい超新星 (SLSNe) は,珍しい,エネルギーに満ちた恒星爆発です.
- 水素に乏しいSLSNe (SLSNe-I) のエネルギー源と祖先システムは,まだ十分に理解されていません.
- 最も知られているSLSNe-Iは,星形成の矮星系に存在します.
研究 の 目的:
- 超新星ASASSN-15lhの発見と特徴を報告する
- ASASSN-15lhの性質と潜在的なエネルギー源を調査する.
- ASASSN-15lhと以前に知られているSLSNe-Iとその宿主銀河を比較する.
主な方法:
- ASASSN-15lhの光度測定とスペクトル観測
- 観測データに基づく光度とエネルギーの計算
- 天文調査による宿主銀河の識別と特徴付け.
主要な成果:
- ASASSN-15lhは,ピーク絶対光度23.5で発見された最も明るい超新星です.
- そのボロメトリックの明るさは (2.2 ± 0.2) × 10^45 ergs/sに達し,これまでのどの超新星よりも2倍以上でした.
- ASASSN-15lhは,4ヶ月以内に合計エネルギー (1.1 ± 0.2) × 10^52 ergsを放射した.
- 超新星は,典型的なSLSNe-Iとは異なり,恒星形成が最小限にある明るい銀河によってホストされています.
結論:
- ASASSN-15lhは 極めて明るい超新星の一種です
- その宿主銀河の性質は,SLSNe-I環境の従来の理解に挑戦しています.
- ASASSN-15lhの莫大なエネルギー出力は,SLSNe-Iを動かすマグネタルモデルの修正または代替を必要とします.
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