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arXiv 1105.3049astro-ph.HE
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NERO -一个极大期后超新星辐射输运程序

NERO - A Post Maximum Supernova Radiation Transport Code

I. Maurer, A. Jerkstrand, P. A. Mazzali, S. Taubenberger, S. Hachinger, M. Kromer, S. Sim, W. Hillebrandt

摘要:

超新星(SN)光谱的解释是必不可少的推导SN喷出物的性质,如密度和成分,这反过来又可以告诉我们他们的祖先和爆炸机制。大量的原子过程对于光谱的形成是重要的。有几种计算SN谱的工具,但它们主要集中在非常早期或晚期。中间阶段,这需要一个NLTE处理的辐射传输很少被研究。在本文中,我们提出了一个新的SN辐射输运代码,NERO,它可以看看这些时代。在稳态假设下,所有的原子过程都在完全NLTE中处理。根据SN类型,这是爆炸后大约50至500天的有效方法。这包括后最大光球和早期和中期星云阶段。作为测试,我们将NERO与Jerkstrand等人(2011)的辐射输运代码和Mazzali等人(2001)的星云代码进行了比较。所有这三种代码都是独立开发的,比较提供了一个宝贵的机会来研究它们的可靠性。目前,NERO是一维的,可用于预测合成爆炸模型的光谱或通过光谱建模推导SN属性。为了证明这一点,我们研究了“正常”的超新星Ia 2005 cf爆炸后50和350天之间的光谱,并确定了最常见的超新星Ia线功能后最大的时代。

英文摘要:

The interpretation of supernova (SN) spectra is essential for deriving SN ejecta properties such as density and composition, which in turn can tell us about their progenitors and the explosion mechanism. A very large number of atomic processes are important for spectrum formation. Several tools for calculating SN spectra exist, but they mainly focus on the very early or late epochs. The intermediate phase, which requires a NLTE treatment of radiation transport has rarely been studied. In this paper we present a new SN radiation transport code, NERO, which can look at those epochs. All the atomic processes are treated in full NLTE, under a steady-state assumption. This is a valid approach between roughly 50 and 500 days after the explosion depending on SN type. This covers the post-maximum photospheric and the early and the intermediate nebular phase. As a test, we compare NERO to the radiation transport code of Jerkstrand et al. (2011) and to the nebular code of Mazzali et al. (2001). All three codes have been developed independently and a comparison provides a valuable opportunity to investigate their reliability. Currently, NERO is one-dimensional and can be used for predicting spectra of synthetic explosion models or for deriving SN properties by spectral modelling. To demonstrate this, we study the spectra of the 'normal' SN Ia 2005cf between 50 and 350 days after the explosion and identify most of the common SN Ia line features at post maximum epochs.

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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