Environments of interacting transients: impostors and Type IIn supernovae
Environments of interacting transients: impostors and Type IIn supernovae
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DOI：
10.1093/mnras/stu684
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发表时间：
2014-04
影响因子：
4.8
通讯作者：
S. Habergham;Joseph P. Anderson;P. James;J. Lyman
中科院分区：
文献类型：
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作者：
S. Habergham;Joseph P. Anderson;P. James;J. Lyman
本文介绍了第一个环境分析的位置的类的“相互作用的瞬态”，即类型IIn超新星（SNe）和SN冒名顶替者。我们讨论了这些瞬变与星星形成、宿主星系类型、金属丰度以及各自宿主内每个事件的位置的关联。鉴于各种研究中经常假设这些爆炸的祖先具有非常高的质量，最值得注意的是直接的祖先检测，有趣的是注意到这些亚型与星星形成的微弱关联，如Hα发射所追踪的，特别是与Ic型SNe相比，后者追踪Hα发射，并被认为来自高质量的祖先。与Ic型SNe相比，这些瞬态的径向分布也非常不同。这为越来越多的假设提供了证据，即这些“相互作用的瞬变”实际上是由各种祖系统组成的。本样本中包含的事件进行了详细讨论，在文献中存在的信息，并提供的环境数据进行比较。冒名顶替者被发现分为两个主要类别，在环境方面：SN 2008S类冒名顶替者落在零Hα发射的区域，而η Carina类冒名顶替者都落在正Hα发射的区域。我们还发现，冒名顶替类起源于较低的金属丰度环境比IIn，Ic和IIP SNe型。
This paper presents one of the first environmental analyses of the locations of the class of ‘interacting transients’, namely Type IIn supernovae (SNe) and SN impostors. We discuss the association of these transients with star formation, host galaxy type, metallicity and the locations of each event within the respective host. Given the frequent assumption of very high mass progenitors for these explosions from various studies, most notably a direct progenitor detection, it is interesting to note the weak association of these subtypes with star formation as traced by Hα emission, particularly in comparison with Type Ic SNe, which trace the Hα emission and are thought to arise from high-mass progenitors. The radial distributions of these transients compared to Type Ic SNe are also very different. This provides evidence for the growing hypothesis that these ‘interacting transients’ are in fact comprised of a variety of progenitor systems. The events contained within this sample are discussed in detail, where information in the literature exists, and compared to the environmental data provided. Impostors are found to split into two main classes, in terms of environment: SN 2008S-like impostors fall on regions of zero Hα emission, whereas η Carina-like impostors all fall on regions with positive Hα emission. We also find indications that the impostor class originate from lower metallicity environments than Type IIn, Ic and IIP SNe.