Subaru Spectroscopy of the Interacting Type Ia Supernova SN 2002ic: Evidence of a Hydrogen-rich, Asymmetric Circumstellar Medium
Subaru Spectroscopy of the Interacting Type Ia Supernova SN 2002ic: Evidence of a Hydrogen-rich, Asymmetric Circumstellar Medium
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DOI：
10.1086/420698
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发表时间：
2003-11
期刊：
影响因子：
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通讯作者：
J. Deng;K. Kawabata;Y. Ohyama;Ken'ichi Nomoto;P. Mazzali;P. Mazzali;Lifan Wang;David J. Jeffery;M. Iye;H. Tomita;Y. Yoshii
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文献类型：
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作者：
J. Deng;K. Kawabata;Y. Ohyama;Ken'ichi Nomoto;P. Mazzali;P. Mazzali;Lifan Wang;David J. Jeffery;M. Iye;H. Tomita;Y. Yoshii
2003年6月27.6 UT获得的Ia型超新星SN 2002 ic的光谱，即，~222休息帧天爆炸后，提出。强的H辐射表明膨胀的SN喷出物和富H的星周介质（CSM）之间的相互作用。SN 2002 ic的光谱类似于SNe 1997 cy和1999 E。这三颗超新星也有相似的光度，这表明它们是相同的现象，CSM也是相似的。我们提出了一个新的分类，IIa型SNe，这些事件。观测到的线的轮廓和线的比例进行测量和讨论内的喷出物CSM相互作用的情况。在H巴耳末，[O III]，和He I线，并在允许的Fe II混合物中的发射，类似于SN 1987 F和Seyfert 1星系的I型光谱。推断为高密度、团块状CSM。强，非常广泛的[Ca II]/Ca II和[O I]/O I排放意味着，并不是所有的外部SN喷出物减速的相互作用，这表明CSM是非球面的。
Optical spectroscopy of the Type Ia supernova SN 2002ic obtained on 2003 June 27.6 UT, i.e., ~222 rest-frame days after explosion, is presented. Strong H emission indicates an interaction between the expanding SN ejecta and an H-rich circumstellar medium (CSM). The spectrum of SN 2002ic resembles those of SNe 1997cy and 1999E. The three SNe also have similar luminosities, suggesting that they are the same phenomenon and that the CSM is also similar. We propose a new classification, Type IIa SNe, for these events. The observed line profiles and line ratios are measured and discussed within the ejecta-CSM interaction scenario. The emission in H Balmer, [O III], and He I lines, and in permitted Fe II blends, resembles the spectra of the Type IIn SN 1987F and of Seyfert 1 galaxies. A high-density, clumpy CSM is inferred. Strong, very broad [Ca II]/Ca II and [O I]/O I emissions imply that not all the outer SN ejecta were decelerated in the interaction, suggesting that the CSM is aspherical.