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http://hdl.handle.net/20.500.12386/26165
Titolo: | A Luminous Peculiar Type Ia Supernova SN 2011hr: More Like SN 1991T or SN 2007if? | Autori: | Zhang, Ju-Jia Wang, Xiao-Feng Sasdelli, Michele Zhang, Tian-Meng Liu, Zheng-Wei Mazzali, Paolo A. Meng, Xiang-Cun Maeda, Keiichi Chen, Jun-Cheng Huang, Fang Zhao, Xu-Lin Zhang, Kai-Cheng Zhai, Qian PIAN, Elena Wang, Bo Chang, Liang Yi, Wei-Min Wang, Chuan-Jun Wang, Xue-Li Xin, Yu-Xin Wang, Jian-Guo Lun, Bao-Li Zheng, Xiang-Ming Zhang, Xi-Liang Fan, Yu-Feng Bai, Jin-Ming |
Data pubblicazione: | 2016 | Rivista: | THE ASTROPHYSICAL JOURNAL | Numero: | 817 | Fascicolo: | 2 | Da pagina:: | 114 | Abstract: | Photometric and spectroscopic observations of a slowly declining, luminous Type Ia supernova (SN Ia) SN 2011hr in the starburst galaxy NGC 2691 are presented. SN 2011hr is found to peak at {M}<SUB>B</SUB>=-19.84+/- 0.40 {mag}, with a postmaximum decline rate ∆m<SUB>15</SUB>(B) = 0.92 ± 0.03 mag. From the maximum-light bolometric luminosity, L=(2.30+/- 0.90)× {10}<SUP>43</SUP> {erg} {{{s}}}<SUP>-1</SUP>, we estimate the mass of synthesized <SUP>56</SUP>Ni in SN 2011hr to be M{(}<SUP>56</SUP>{Ni})=1.11+/- 0.43 {M}<SUB>☉ </SUB>. SN 2011hr appears more luminous than SN 1991T at around maximum light, and the absorption features from its intermediate-mass elements (IMEs) are noticeably weaker than those of the latter at similar phases. Spectral modeling suggests that SN 2011hr has IMEs of ∼0.07 {M}<SUB>☉ </SUB> in the outer ejecta, which is much lower than the typical value of normal SNe Ia (I.e., 0.3-0.4 {M}<SUB>☉ </SUB>) and is also lower than the value of SN 1991T (I.e., ∼0.18 {M}<SUB>☉ </SUB>). These results indicate that SN 2011hr may arise from a Chandrasekhar-mass white dwarf progenitor that experienced a more efficient burning process in the explosion. Nevertheless, it is still possible that SN 2011hr may serve as a transitional object connecting the SN 1991T-like SNe Ia with a superluminous subclass like SN 2007if given that the latter also shows very weak IMEs at all phases. | URI: | http://hdl.handle.net/20.500.12386/26165 | URL: | https://iopscience.iop.org/article/10.3847/0004-637X/817/2/114 | ISSN: | 0004-637X | DOI: | 10.3847/0004-637X/817/2/114 | Bibcode ADS: | 2016ApJ...817..114Z | Fulltext: | open |
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