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  • SN 2016ije: An SN 2002es-li...
    Li, Zhitong; Zhang, Tianmeng; Wang, Xiaofeng; Zhang, Jujia; Galbany, Lluís; Filippenko, Alexei V.; Brink, Thomas G.; Ashall, Chris; Zheng, WeiKang; de Jaeger, Thomas; Ragosta, Fabio; Deckers, Maxime; Gromadzki, Mariusz; Young, D. R.; Xi, Gaobo; Chen, Juncheng; Zhao, Xulin; Sai, Hanna; Yan, Shengyu; Xiang, Danfeng; Chen, Zhihao; Li, Wenxiong; Wang, Bo; Zou, Hu; Sui, Jipeng; Wang, Jiali; Ma, Jun; Nie, Jundan; Xue, Suijian; Zhou, Xu; Zhou, Zhimin

    The Astrophysical journal, 06/2023, Letnik: 950, Številka: 1
    Journal Article

    Abstract We have conducted photometric and spectroscopic observations of the peculiar Type Ia supernova (SN Ia) 2016ije that was discovered through the Tsinghua-NAOC Transient Survey. This peculiar object exploded in the outskirts of a metal-poor, low-surface brightness galaxy (i.e., M g = −14.5 mag). Our photometric analysis reveals that SN 2016ije is subluminous ( M B , max = −17.65 ± 0.06 mag) but exhibits relatively broad light curves (Δ m 15 ( B ) = 1.35 ± 0.14 mag), similar to the behavior of SN 2002es. Our analysis of the bolometric light curve indicates that only 0.14 ± 0.04 M ⊙ of 56 Ni was synthesized in the explosion of SN 2016ije, which suggests a less energetic thermonuclear explosion when compared to normal SNe Ia, and this left a considerable amount of unburned materials in the ejecta. Spectroscopically, SN 2016ije resembles other SN 2002es-like SNe Ia, except that the ejecta velocity inferred from its carbon absorption line (∼4500 km s −1 ) is much lower than that from silicon lines (∼8300 km s −1 ) at around the maximum light. Additionally, most of the absorption lines are broader than other 02es-like SNe Ia. These peculiarities suggest the presence of significant unburned carbon in the inner region and a wide line-forming region along the line of sight. These characteristics suggest that SN 2016ije might originate from the violent merger of a white dwarf binary system, when viewed near an orientation along the iron-group-element cavity caused by the companion star.