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Optical observations of the 2002cx-like supernova 2014ek and characterizations of SNe Iax
Li, Linyi1; Wang, Xiaofeng1; Zhang JJ(张居甲)2,3,4; Arcavi, Iair5,6; Zhang, Tianmeng7,8; Rui, Liming1; Hosseinzadeh, Griffin5,6; Howell, D. Andrew5,6; McCully, Curtis5,6; Zhang, Kaicheng1; Valenti, Stefano9; Mo, Jun1; Li, Wenxiong1; Huang, Fang1,10; Xiang, Danfeng1; Wang, Lifan11,12; Zhou, Xu8
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
2018-08-01
Volume478Issue:4Pages:4575-4589
DOI10.1093/mnras/sty1303
Contribution Rank第2完成单位
Indexed BySCI
KeywordSupernovae: General Supernovae: Individual: Sn 2014ek
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.

Funding ProjectChinese Academy of Sciences ; People's Government of Yunnan Province ; National Natural Science Foundation of China (NSFC)[11178003] ; National Natural Science Foundation of China (NSFC)[11325313] ; National Natural Science Foundation of China (NSFC)[11633002] ; National Program on Key Research and Development Project[2016YFA0400803] ; National Science Foundation of China (NSFC)[11403096] ; National Science Foundation of China (NSFC)[11773067] ; Youth Innovation Promotion Association of the CAS ; Western Light Youth Project ; Key Research Program of the CAS[KJZD-EW-M06] ; NSFC[11203034] ; Open Project Program of the Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences ; US National Science Foundation[1313484] ; NASA through the Einstein Fellowship Program[PF6-170148]
Funding OrganizationChinese Academy of Sciences ; People's Government of Yunnan Province ; National Natural Science Foundation of China (NSFC)[11178003, 11325313, 11633002] ; National Program on Key Research and Development Project[2016YFA0400803] ; National Science Foundation of China (NSFC)[11403096, 11773067] ; Youth Innovation Promotion Association of the CAS ; Western Light Youth Project ; Key Research Program of the CAS[KJZD-EW-M06] ; NSFC[11203034] ; Open Project Program of the Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences ; US National Science Foundation[1313484] ; NASA through the Einstein Fellowship Program[PF6-170148]
Language英语
Subject Area天文学
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherOXFORD UNIV PRESS
Publication PlaceGREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND
ISSN0035-8711
URL查看原文
WOS IDWOS:000441288300020
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordGamma-ray Bursts ; Light Curves ; Low-luminosity ; White-dwarfs ; Models ; Time ; Deflagrations ; Spectroscopy ; Ultraviolet ; Extinction
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/17883
Collection丽江天文观测站(南方基地)
中国科学院天体结构与演化重点实验室
Corresponding AuthorLi, Linyi; Wang, Xiaofeng
Affiliation1.Physics Department and Tsinghua Center for Astrophysics (THCA), Tsinghua University, Beijing 100084, China
2.Yunnan Observatories (YNAO), Chinese Academy of Science s, Kunming 650216, China
3.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650216, China
4.Center for Astronomical Mega-Science, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing 100012, China
5.Las Cumbres Observatory, 6740 Cortona Dr Suite 102, Goleta, CA 93117-5575, USA
6.Department of Physics, University of California, Santa Barbara, CA 93106-9530, USA
7.Key Laboratory of Optical Astronomy, National Astronomical Observatories of China, Chinese Academy of Sciences, Beijing 100012, China
8.School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 101408, China
9.Department of Physics, University of California, Davis, CA 95616, USA
10.Department of Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China
11.George P. and Cynthia Woods Mitchell Institute for Fundamental Physics & Astronomy, Texas A. & M. University, College Station, TX 77843, USA
12.Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210034, China
Recommended Citation
GB/T 7714
Li, Linyi,Wang, Xiaofeng,Zhang JJ,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 JJ.,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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