SN 2012ij: A Low-luminosity Type Ia Supernova and Evidence for a Continuous Distribution from a 91bg-like Explosion to Normal Ones

被引：12

作者：

Li, Zhitong ^{[1
,2
]}

Zhang, Tianmeng ^{[1
,2
]}

Wang, Xiaofeng ^{[3
,4
,5
]}

Sai, Hanna ^{[3
,4
]}

Zhang, Jujia ^{[6
,7
]}

Chen, Juncheng ^{[8
]}

Zhao, Xulin ^{[9
]}

Yan, Shengyu ^{[3
,4
]}

Wang, Bo ^{[6
,7
]}

Phillips, Mark M. ^{[10
]}

Hsiao, Eric Y. ^{[10
]}

Morrell, Nidia ^{[10
]}

Contreras, Carlos ^{[10
]}

Burns, Christopher R. ^{[11
]}

Ashall, Christopher ^{[12
]}

Stritzinger, Maximilian ^{[13
]}

Krisciunas, Kevin ^{[14
]}

Prieto, Jose ^{[15
]}

Zou, Hu ^{[1
]}

Wang, Jiali ^{[1
]}

Ma, Jun ^{[1
,2
]}

Nie, Jundan ^{[1
]}

Xue, Suijian ^{[1
]}

Zhou, Xu ^{[1
]}

Zhou, Zhimin ^{[1
]}

Xiang, Danfeng ^{[3
,4
]}

Xi, Gaobo ^{[3
,4
]}

机构：

[1] Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100101, Peoples R China

[2] Univ Chinese Acad Sci, Sch Astron & Space Sci, Beijing 101408, Peoples R China

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

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

[5] Beijing Acad Sci & Technol, Beijing Planetarium, Beijing 100044, Peoples R China

[6] Chinese Acad Sci, Yunnan Observ, Kunming 650216, Yunnan, Peoples R China

[7] Chinese Acad Sci, Key Lab Struct & Evolut Celestial Objects, Kunming 650216, Yunnan, Peoples R China

[8] Wu Zhou Univ, Wuzhou 543002, Peoples R China

[9] Tianjin Univ Technol, Dept Phys, Tianjin 300384, Peoples R China

[10] Las Campanas Observ, Carnegie Observ, Casilla 601, La Serena, Chile

[11] Observ Carnegie Inst Sci, 813 Santa Barbara St, Pasadena, CA 91101 USA

[12] Univ Hawaii Manoa, Inst Astron, 2680 Woodlawn Dr, Honolulu, HI 96822 USA

[13] Aarhus Univ, Dept Phys & Astron, Ny Munkegade 120, DK-8000 Aarhus C, Denmark

[14] Texas A&M Univ, George P & Cynthia Woods Mitchell Inst Fundamenta, Dept Phys & Astron, College Stn, TX 77843 USA

[15] Princeton Univ, Dept Astrophys Sci, 4 Ivy Lane, Princeton, NJ 08544 USA

来源：

ASTROPHYSICAL JOURNAL | 2022年 / 927卷 / 02期

基金：

中国国家自然科学基金; 美国国家科学基金会;

关键词：

CHANDRASEKHAR MASS MODELS; SUB-CHANDRASEKHAR; LIGHT CURVES; CIRCUMSTELLAR MATERIAL; INFRARED-SPECTROSCOPY; ABSOLUTE MAGNITUDES; IMPROVED DISTANCES; SECONDARY MAXIMUM; DETONATION MODEL; HUBBLE CONSTANT;

D O I：

10.3847/1538-4357/ac4e17

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

In this paper, we present photometric and spectroscopic observations of the subluminous Type Ia supernova (SN Ia) 2012ij, which has an absolute B-band peak magnitude MB,max=-17.95 +/- 0.15 B-band light curve exhibits a fast postpeak decline with Delta m(15)(B) = 1.86 +/- 0.05 mag. All the R- and I/i-band light curves show a weak secondary peak/shoulder feature at about 3 weeks after the peak, like some transitional subclass of SNe Ia, which could result from an incomplete merger of near-infrared (NIR) double peaks. The spectra are characterized by Ti ii and strong Si ii lambda 5972 absorption features that are usually seen in low-luminosity objects like SN 1999by. The NIR spectrum before maximum light reveals weak carbon absorption features, implying the existence of unburned materials. We compare the observed properties of SN 2012ij with those predicted by the sub-Chandrasekhar-mass and the Chandrasekhar-mass delayed-detonation models and find that both optical and NIR spectral properties can be explained to some extent by these two models. By comparing the secondary maximum features in the I and i bands, we suggest that SN 2012ij is a transitional object linking normal SNe Ia to typical 91bg-like ones. From the published sample of SNe Ia from the Carnegie Supernova Project II, we estimate that the fraction of SN 2012ij-like SNe Ia is not lower than similar to 2%.

引用

页数：19

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