A LUMINOUS PECULIAR TYPE IA SUPERNOVA SN 2011HR: MORE LIKE SN 1991T OR SN 2007if?

被引：10

作者：

Zhang, Ju-Jia ^{[1
,2
,3
,4
]}

Wang, Xiao-Feng ^{[3
,4
]}

Sasdelli, Michele ^{[5
,6
]}

Zhang, Tian-Meng ^{[7
]}

Liu, Zheng-Wei ^{[8
]}

Mazzali, Paolo A. ^{[5
,6
]}

Meng, Xiang-Cun ^{[1
,2
]}

Maeda, Keiichi ^{[9
,10
]}

Chen, Jun-Cheng ^{[3
,4
]}

Huang, Fang ^{[3
,4
]}

Zhao, Xu-Lin ^{[3
,4
]}

Zhang, Kai-Cheng ^{[3
,4
]}

Zhai, Qian ^{[1
,2
,11
]}

Pian, Elena ^{[12
,13
]}

Wang, Bo ^{[1
,2
]}

Chang, Liang ^{[1
,2
]}

Yi, Wei-Min ^{[1
,2
]}

Wang, Chuan-Jun ^{[1
,2
,11
]}

Wang, Xue-Li ^{[1
,2
]}

Xin, Yu-Xin ^{[1
,2
]}

Wang, Jian-Guo ^{[1
,2
]}

Lun, Bao-Li ^{[1
,2
]}

Zheng, Xiang-Ming ^{[1
,2
]}

Zhang, Xi-Liang ^{[1
,2
]}

Fan, Yu-Feng ^{[1
,2
]}

Bai, Jin-Ming ^{[1
,2
]}

机构：

[1] Chinese Acad Sci, Yunnan Observ YNAO, Kunming 650011, Peoples R China

[2] Chinese Acad Sci, Key Lab Struct & Evolut Celestial Objects, Kunming 650011, Peoples R China

[3] Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China

[4] Tsinghua Univ, Tsinghua Ctr Astrophys THCA, Beijing 100084, Peoples R China

[5] Liverpool John Moores Univ, Astrophys Res Inst, Liverpool Sci Pk,146 Brownlow Hill, Liverpool L3 5RF, Merseyside, England

[6] Max Planck Inst Astrophys, Karl Schwarzschild Str 1, D-85748 Garching, Germany

[7] Chinese Acad Sci, NAOC, Beijing 100012, Peoples R China

[8] Argelander Inst Astron, Hugel 71, D-53121 Bonn, Germany

[9] Kyoto Univ, Dept Astron, Kyoto 6068502, Japan

[10] Univ Tokyo, Kavli Inst Phys & Math Universe WPI, 5-1-5 Kashiwanoha, Kashiwa, Chiba 2778583, Japan

[11] Chinese Acad Sci, Univ Chinese Acad Sci, Beijing 100049, Peoples R China

[12] INAF IASF Bo, Via Gobetti 101, I-40129 Bologna, Italy

[13] Scuola Normale Super Pisa, Piazza Cavalieri 7, I-56126 Pisa, Italy

来源：

ASTROPHYSICAL JOURNAL | 2016年 / 817卷 / 02期

基金：

美国国家科学基金会;

关键词：

galaxies: individual (NGC 2691); supernovae: general; supernovae:; individual; (SN; 2011hr; SN; 1991T; 2007if); GRAVITATIONALLY CONFINED DETONATION; NEAR-INFRARED OBSERVATIONS; HIGH-VELOCITY FEATURES; HUBBLE-SPACE-TELESCOPE; LIGHT CURVES; ABUNDANCE STRATIFICATION; WHITE-DWARF; SPECTROSCOPIC OBSERVATIONS; ULTRAVIOLET OBSERVATIONS; EXPLOSION;

D O I：

10.3847/0004-637X/817/2/114

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 MB = -19.84 +/- 0.40 mag, with a postmaximum decline rate Delta(m15)(B) = 0.92. +/- 0.03 mag. From the maximum-light bolometric luminosity, L = (2.30 +/- 0.90) x 10(43) erg s(-1), we estimate the mass of synthesized Ni-56 in SN 2011hr to be M(Ni-56) = 1.11 +/- 0.43M(circle dot). 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 similar to 0.07 M-circle dot in the outer ejecta, which is much lower than the typical value of normal SNe Ia (i.e., 0.3-0.4 M-circle dot) and is also lower than the value of SN 1991T (i.e., similar to 0.18 M-circle dot). 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.

引用

页数：13

共 47 条

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