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arXiv 0904.0637astro-ph.SR
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SN 1999 ga:一颗低光度线性型II超新星?

SN 1999ga: a low-luminosity linear type II supernova?

A. Pastorello, R. M. Crockett, R. Martin, S. J. Smartt, G. Altavilla, S. Benetti, M. T. Botticella, E. Cappellaro, S. Mattila, J. R. Maund, S. D. Ryder, M. Salv… 展开作者

A. Pastorello, R. M. Crockett, R. Martin, S. J. Smartt, G. Altavilla, S. Benetti, M. T. Botticella, E. Cappellaro, S. Mattila, J. R. Maund, S. D. Ryder, M. Salvo, S. Taubenberger, M. Turatto

摘要:

II型线性超新星被认为是由在爆炸时已经失去大部分H包层的祖先产生的,人们对它们的了解很少,因为它们只是偶尔被发现。它们可能本质上是稀有的,但由于其快速的光度演化而产生的选择效应也可能在限制探测数量方面发挥重要作用。在这种情况下,一个亚发光II型线性事件的发现甚至更有趣。研究了在邻近的旋涡星系NGC 2442中爆发的II型SN 1999ga的物理性质,并确定了其爆发地点。SN 1999ga的光谱和光度观测使我们能够限制爆炸的能量,并估计喷出物质的质量,从而揭示出祖星在其生命最后阶段的性质。对爆炸地点附近环境的研究提供了关于这些不寻常的超新星与容纳它们的星系性质之间可能关系的信息。尽管缺乏早期的观测,我们提供了合理的证据,SN 1999ga可能是一个II型线性超新星,喷射出几个太阳质量的物质,具有非常少量的放射性元素,数量级为0.01太阳质量。

英文摘要:

Type II-linear supernovae are thought to arise from progenitors that have lost most of their H envelope by the time of the explosion, and they are poorly understood because they are only occasionally discovered. It is possible that they are intrinsically rare, but selection effects due to their rapid luminosity evolution may also play an important role in limiting the number of detections. In this context, the discovery of a subluminous type II-linear event is even more interesting. We investigate the physical properties and characterise the explosion site of the type II SN 1999ga, which exploded in the nearby spiral galaxy NGC 2442. Spectroscopic and photometric observations of SN 1999ga allow us to constrain the energetics of the explosion and to estimate the mass of the ejected material, shedding light on the nature of the progenitor star in the final stages of its life. The study of the environment in the vicinity of the explosion site provides information on a possible relation between these unusual supernovae and the properties of the galaxies hosting them. Despite the lack of early-time observations, we provide reasonable evidence that SN 1999ga was probably a type II-linear supernova that ejected a few solar masses of material, with a very small amount of radioactive elements of the order of 0.01 solar masses.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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