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Optical observations of the 2002cx-like supernova 2014ek and characterizations of SNe Iax
Li, Linyi1,2; Wang, Xiaofeng1,2; Zhang, Jujia3,4,5; Arcavi, Iair6,7; Zhang, Tianmeng8,9; Rui, Liming1,2; Hosseinzadeh, Griffin6,7; Howell, D. Andrew6,7; McCully, Curtis6,7; Zhang, Kaicheng1,2; Valenti, Stefano10; Mo, Jun1,2; Li, Wenxiong1,2; Huang, Fang1,2,11; Xiang, Danfeng1,2; Wang, Lifan12,13; Zhou, Xu9
2018-08-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume478Issue:4Pages:4575-4589
Abstract

We present optical observations of supernova (SN) 2014ek, discovered during the Tsinghua University-National Astronomical Observatories, Chinese Academy of Sciences (NAOC) Transient Survey (TNTS), which shows properties that are consistent with those of SN2002cx-like events (dubbed as SNe Iax). The photometry indicates that it is underluminous compared with normal SNe Ia, with the absolute V-band peak magnitude being -17.66 +/- 0.20 mag. The spectra are characterized by highly ionized Fe III and intermediate-mass elements (IMEs). The expansion velocity of the ejecta is found to be similar to 5000 km s(-1) near the maximum light, only half of that measured for normal SNe Ia. The overall spectral evolution is quite similar to that of SN 2002cx and SN 2005hk, while the absorption features of the main IMEs seem to be relatively weaker. The Ni-56 mass synthesized in the explosion is estimated to be about 0.08M(circle dot) from the pseudo-bolometric light curve. Based on a large sample of SNe Iax, we examined the relations between peak luminosity, ejecta velocity, decline rate and peak V-R colour, but did not find noticeable correlations between these observables, in particular when a few extreme events like SN 2008ha are excluded from the analysis. For this sample, we also studied the birthplace environments and confirm that they still hold the trend of occurring preferentially in late-type spiral galaxies. Moreover, SNe Iax tend to occur in large star-forming regions of their host galaxies, more similar to SNe Ibc than SNe II, favouring the idea that their progenitors should be associated with very young stellar populations. Nevertheless, the progenitors of SNe Iax may have relatively lower metallicity, as suggested by the evidence that they prefer to explode in outer regions of host galaxies.

Keywordsupernovae: general supernovae: individual: SN 2014ek
DOI10.1093/mnras/sty1303
WOS KeywordGAMMA-RAY BURSTS ; LIGHT CURVES ; LOW-LUMINOSITY ; WHITE-DWARFS ; MODELS ; TIME ; DEFLAGRATIONS ; SPECTROSCOPY ; ULTRAVIOLET ; EXTINCTION
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000441288300020
PublisherOXFORD UNIV PRESS
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/21779
Collection中国科学院紫金山天文台
Corresponding AuthorLi, Linyi; Wang, Xiaofeng
Affiliation1.Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China
2.Tsinghua Univ, Tsinghua Ctr Astrophys THCA, Beijing 100084, Peoples R China
3.Chinese Acad Sci, Yunnan Observ YNAO, Kunming 650216, Yunnan, Peoples R China
4.Chinese Acad Sci, Key Lab Struct & Evolut Celestial Objects, Kunming 650216, Yunnan, Peoples R China
5.Chinese Acad Sci, Ctr Astron Mega Sci, 20A Datun Rd, Beijing 100012, Peoples R China
6.Las Cumbres Observ, 6740 Cortona Dr Suite 102, Goleta, CA 93117 USA
7.Univ Calif Santa Barbara, Dept Phys, Santa Barbara, CA 93106 USA
8.Chinese Acad Sci, Key Lab Opt Astron, Natl Astron Observ China, Beijing 100012, Peoples R China
9.Univ Chinese Acad Sci, Sch Astron & Space Sci, Beijing 101408, Peoples R China
10.Univ Calif Davis, Dept Phys, Davis, CA 95616 USA
11.Shanghai Jiao Tong Univ, Dept Astron, Shanghai 200240, Peoples R China
12.Texas A&M Univ, George P & Cynthia Woods Mitchell Inst Fundamenta, College Stn, TX 77843 USA
13.Chinese Acad Sci, Purple Mt Observ, Nanjing 210034, Jiangsu, Peoples R China
Recommended Citation
GB/T 7714
Li, Linyi,Wang, Xiaofeng,Zhang, Jujia,et al. Optical observations of the 2002cx-like supernova 2014ek and characterizations of SNe Iax[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2018,478(4):4575-4589.
APA Li, Linyi.,Wang, Xiaofeng.,Zhang, Jujia.,Arcavi, Iair.,Zhang, Tianmeng.,...&Zhou, Xu.(2018).Optical observations of the 2002cx-like supernova 2014ek and characterizations of SNe Iax.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,478(4),4575-4589.
MLA Li, Linyi,et al."Optical observations of the 2002cx-like supernova 2014ek and characterizations of SNe Iax".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 478.4(2018):4575-4589.
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