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arXiv 1208.0307astro-ph.HEastro-ph.SR
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伽马射线暴超新星的性质

The Nature of Gamma Ray Burst Supernovae

Zach Cano

摘要:

伽马射线暴(GRB)和超新星(SNe)是宇宙中最明亮、能量最高的物理过程。已知核心坍缩SNe是由大质量恒星的引力坍缩和随后的爆炸引起的(附近核心坍缩SNe的前身已经被成像并明确识别)。长持续时间伽玛暴(L-GRB)的前身星也被认为是大质量恒星,这主要是由于在时间和空间上与大多数L-GRB相一致的高能核坍缩超新星的发生和探测。然而,关于这些事件的性质存在许多悬而未决的问题:祖先有多大?当它们爆炸时,它们处于什么样的进化阶段?它们是以单星还是双星系统的形式存在(或者两者都存在,比例是多少)?本论文的工作旨在加深我们对长持续时间GRB超新星(GRB-SNe)起源类型的理解。这项工作是基于三个GRB-SNe事件获得的光学测光:GRB 060729,GRB 090618和XRF 100316 D(X射线闪光类似于L-GRB,但具有较低的峰值能量)。对于GRB 060729和GRB 090618,我们模拟了光学光变曲线,并考虑了来自三个光源的光:宿主星系,余辉和超新星。当我们去除宿主通量并对余辉进行建模时,剩余的通量在光变曲线的形状和光谱能量分布的形状上都类似于SN的通量。我们对XRF 100316 D及其光谱确认的Ic-BL SN 2010 bh的研究更加详细,因为我们能够在许多滤光片中获得光学和红外数据,我们利用这些数据创建了一个准测辐射热光曲线,我们建立模型来确定SN 2010 bh的物理参数。

英文摘要:

Gamma Ray Bursts (GRBs) and Supernovae (SNe) are among the brightest and most energetic physical processes in the universe. It is known that core-collapse SNe arise from the gravitational collapse and subsequent explosion of massive stars (the progen- itors of nearby core-collapse SNe have been imaged and unambiguously identified). It is also believed that the progenitors of long-duration GRBs (L-GRBs) are massive stars, mainly due to the occurrence and detection of very energetic core-collapse su- pernovae that happen both temporally and spatially coincident with most L-GRBs. However many outstanding questions regarding the nature of these events exist: How massive are the progenitors? What evolutionary stage are they at when they explode? Do they exist as single stars or in binary systems (or both, and to what fractions)? The work presented in this thesis attempts to further our understanding at the types of progenitors that give rise to long-duration GRB supernovae (GRB-SNe). This work is based on optical photometry obtained for three GRB-SNe events: GRB 060729, GRB 090618 and XRF 100316D (an X-Ray Flash is similar to a L-GRB, but has a lower peak energy). For GRB 060729 and GRB 090618 we model the optical light curves and account for light coming from three sources: the host galaxy, the afterglow and the supernova. When we remove the host flux, and model the afterglow, the re- maining flux resembles that of a SN, both in the shape of the light curve and the shape of the spectral energy distribution. Our investigation of XRF 100316D and its spectroscopically-confirmed Ic-BL SN 2010bh is more detailed as we were able to obtain optical and infrared data in many filters, which we utilize to created a quasi-bolometric light curve that we model to determine physical parameters of the SN...

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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