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arXiv 0710.3636astro-ph
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奇异Ia型超新星SN 2005 hk的400天演化

The evolution of the peculiar Type Ia supernova SN 2005hk over 400 days

D. K. Sahu, Masaomi Tanaka, G. C. Anupama, Koji S. Kawabata, Keiichi Maeda, Nozomu Tominaga, Ken'ichi Nomoto, Paolo A. Mazzali, T. P. Prabhu

摘要:

本文介绍和分析了奇异Ia型超新星SN 2005 hk的$UBVRI$光度学和中等分辨率光谱学,涵盖了极大爆发前到爆发后400天左右的阶段。与“正常”的Ia型超新星相比,这颗超新星被发现是不亮的。SN 2005 hk的光度和光谱演化与奇特的Ia型事件SN 2002 cx非常相似。超新星喷出物的膨胀速度被发现低于正常的Ia型事件。在爆炸后几天获得的$\gsim 200$光谱没有显示出禁用的[ \ion{Fe}{ii} ]、[ \ion{Fe}{iii} ]和[ \ion{Co}{iii} ]谱线的存在,但主要是窄的、允许的\ion{Fe}{ii}、NIR \ion{Ca}{ii}和\ion{Na}{i}谱线,具有P-Cygni轮廓。我们发现,具有比典型Ia型超新星更小动能($\KE = 0.3 \times 10^{51} {\rm ergs}$)和质量为1000000的热核爆炸模型能很好地解释观测到的热光度曲线。在这次爆炸中合成的\Nifs的质量是$0.18 \Msun$。早期的光谱成功地模拟了这个能量较低的模型与一些修改的丰度分布。晚光谱被解释为光球成分和星云成分的组合。

英文摘要:

$UBVRI$ photometry and medium resolution optical spectroscopy of peculiar Type Ia supernova SN 2005hk are presented and analysed, covering the pre-maximum phase to around 400 days after explosion. The supernova is found to be underluminous compared to "normal" Type Ia supernovae. The photometric and spectroscopic evolution of SN 2005hk is remarkably similar to the peculiar Type Ia event SN 2002cx. The expansion velocity of the supernova ejecta is found to be lower than normal Type Ia events. The spectra obtained $\gsim 200$ days since explosion do not show the presence of forbidden [\ion{Fe}{ii}], [\ion{Fe}{iii}] and [\ion{Co}{iii}] lines, but are dominated by narrow, permitted \ion{Fe}{ii}, NIR \ion{Ca}{ii} and \ion{Na}{i} lines with P-Cygni profiles. Thermonuclear explosion model with Chandrasekhar mass ejecta and a kinetic energy smaller ($\KE = 0.3 \times 10^{51} {\rm ergs}$) than that of canonical Type Ia supernovae is found to well explain the observed bolometric light curve. The mass of \Nifs synthesized in this explosion is $0.18 \Msun$. The early spectra are successfully modeled with this less energetic model with some modifications of the abundance distribution. The late spectrum is explained as a combination of a photospheric component and a nebular component.

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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