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Massive stars exploding in a He-rich circumstellar medium: X. Flash spectral features in the Type Ibn SN 2019cj and observations of SN 2018jmt

文献类型：期刊论文

作者Wang, Z.-Y.41,42; Pastorello, A.40; Maeda, K.39; Reguitti, A.38,40; Cai YZ(蔡永志)35,36,37; Andrew Howell, D.33,34; Benetti, S.40; Buckley, D. A.30,31,32; Cappellaro, E.40; Carini, R.29
刊名Astronomy and Astrophysics
出版日期2024-11-01
卷号691
关键词circumstellar matter supernovae: general supernovae: individual: SN 2018jmt supernovae: individual: SN 2019cj
ISSN号0004-6361
DOI10.1051/0004-6361/202451131
产权排序第6完成单位
文献子类Journal article (JA)
英文摘要We present optical and near-infrared observations of two Type Ibn supernovae (SNe), SN 2018jmt and SN 2019cj. Their light curves have rise times of about ten days, reaching an absolute peak magnitude of Mg(SN 2018jmt) = - 19.07 ± 0.37 and MV(SN 2019cj) = - 18.94 ± 0.19 mag, respectively. The early-time spectra of SN 2018jmt are dominated by a blue continuum, accompanied by narrow (600- 1000 km s- 1) HeI lines with the P-Cygni profile. At later epochs, the spectra become more similar to those of the prototypical SN Ibn 2006jc. At early phases, the spectra of SN 2019cj show flash ionisation emission lines of CIII, NIII, and HeII superposed on a blue continuum. These features disappear after a few days, and then the spectra of SN 2019cj evolve similarly to those of SN 2018jmt. The spectra indicate that the two SNe exploded within a He-rich circumstellar medium (CSM) lost by the progenitors a short time before the explosion. We modelled the light curves of the two SNe Ibn to constrain the progenitor and the explosion parameters. The ejecta masses are consistent with either what is expected for a canonical SN Ib (~2 Mo) or for a massive Wolf Rayet star (> ~4 Mo), with the kinetic energy on the order of 1051 erg. The lower limit on the ejecta mass (> ~2 Mo) argues against a scenario involving a relatively low-mass progenitor (e.g. MZAMS ~ 10 Mo). We set a conservative upper limit of ~0.1 Mo for the 56Ni masses in both SNe. From the light curve modelling, we determined a two-zone CSM distribution, with an inner, flat CSM component and an outer CSM with a steeper density profile. The physical properties of SN 2018jmt and SN 2019cj are consistent with those expected from the core collapse of relatively massive envelope-stripped stars. © The Authors 2024.
学科主题天文学 ; 恒星与银河系
URL标识查看原文
资助项目National Natural Science Foundation of China[12303054]
语种英语
资助机构National Natural Science Foundation of China[12303054]
源URL[http://ir.ynao.ac.cn/handle/114a53/27799]  
专题云南天文台_丽江天文观测站（南方基地）
云南天文台_大样本恒星演化研究组
云南天文台_中国科学院天体结构与演化重点实验室
作者单位1.Advanced Institute of Natural Sciences, Beijing Normal University, Zhuhai, 519087, China
2.Institute for Frontier in Astronomy and Astrophysics, Beijing Normal University, Beijing, 102206, China;
3.Purple Mountain Observatory, Chinese Academy of Sciences, 10 Yuan Hua Road, Jiangsu, Nanjing, 210023, China;
4.Center for Fundamental Physics, School of Mechanics and Opticelectrical Physics, Anhui University of Science and Technology, Huainan, Anhui, 232001, China;
5.Millennium Institute of Astrophysics, Nuncio Monseñor Sotero Sanz 100, Of. 104, Providencia, Santiago, Chile;
6.Institut d'Estudis Espacials de Catalunya (IEEC), Barcelona, Castelldefels, 08860, Spain;
7.Center for Astrophysics and Cosmology, University of Nova Gorica, Vipavska 11c, Ajdovščina, 5270, Slovenia;
8.Physics and Astronomy Department, Johns Hopkins University, Baltimore, MD, 21218, United States;
9.Inaf - Osservatorio Astronomico d'Abruzzo, Via M. Maggini snc, Teramo, 64100, Italy;
10.Manipal Centre for Natural Sciences, Manipal Academy of Higher Education, Manipal, Karnataka, 576104, India;
推荐引用方式
GB/T 7714		 Wang, Z.-Y.,Pastorello, A.,Maeda, K.,et al. Massive stars exploding in a He-rich circumstellar medium: X. Flash spectral features in the Type Ibn SN 2019cj and observations of SN 2018jmt[J]. Astronomy and Astrophysics,2024,691.
APA Wang, Z.-Y..,Pastorello, A..,Maeda, K..,Reguitti, A..,蔡永志.,...&Zhu, X.-J..(2024).Massive stars exploding in a He-rich circumstellar medium: X. Flash spectral features in the Type Ibn SN 2019cj and observations of SN 2018jmt.Astronomy and Astrophysics,691.
MLA Wang, Z.-Y.,et al."Massive stars exploding in a He-rich circumstellar medium: X. Flash spectral features in the Type Ibn SN 2019cj and observations of SN 2018jmt".Astronomy and Astrophysics 691(2024).

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