天文学. ASASSN-15lh:一个高度超亮的超新星
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
概括
天文学家发现了ASASSN-15lh,这是迄今为止观察到的最明亮的超新星. 这场极其明亮的事件挑战了目前超光超新星 (SLSNe-I) 及其起源的模型.
科学领域:
- 天文学
- 天体物理学
- 宇宙学
背景情况:
- 超亮超新星 (SLSNe) 是一种罕见的,充满活力的恒星爆炸.
- 缺乏的SLSNe (SLSNe-I) 的能量来源和原始系统尚不清楚.
- 大多数已知的SLSNe-I存在于恒星形成的矮星系中.
研究的目的:
- 报告这一发现并描述前所未有的超新星ASASSN-15lh.
- 调查ASASSN-15lh的性质和潜在的能源.
- 将ASASSN-15lh与之前已知的SLSNe-I及其宿主星系进行比较.
主要方法:
- 对ASASSN-15lh进行光度和光谱观测.
- 基于观测数据的亮度和能量计算.
- 通过天文调查识别和描述宿主星系.
主要成果:
- ASASSN-15lh是发现的最明亮的超新星,峰值绝对光度为-23.5.
- 它的光度达到 (2.2 ± 0.2) × 10^45 ergs/s,是之前任何已知的超新星的两倍多.
- 在四个月内,ASASSN-15lh辐射的总能量为 (1.1 ± 0.2) × 10^52 ergs.
- 这颗超新星是由一个发光的星系组成的,与典型的SLSNe-I不同.
结论:
- ASASSN-15lh代表了一类极其明亮的超新星.
- 它的宿主星系属性挑战了对SLSNe-I环境的传统理解.
- ASASSN-15lh的巨大能量输出可能需要修改或替代SLSNe-I的磁器模型.
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