Luminous, rapidly declining supernovae as stripped transitional objects in low-metallicity environments: The case of SN 2022lxg
文献类型：期刊论文
| 作者 | Charalampopoulos, P.23; Kotak, R.23; Sollerman, J.22; Gutiérrez, C. P.20,21; Pursiainen, M.19; Killestein, T. L.23; Schulze, S.18; Pessi, P. J.22; Maeda, K.17; Kangas, T.16,23 |
| 刊名 | Astronomy and Astrophysics
 |
| 出版日期 | 2025-08-01 |
| 卷号 | 700 |
| 关键词 | circumstellar matter stars: mass loss supernovae: general supernovae: individual: SN 2022lxg |
| ISSN号 | 0004-6361 |
| DOI | 10.1051/0004-6361/202554648 |
| 产权排序 | 第9完成单位 |
| 文献子类 | Journal article (JA) |
| 英文摘要 | We present an analysis of the optical and near-infrared properties of SN 2022lxg, a bright (Mg peak=-19.41 mag) and rapidly evolving supernova (SN). It was discovered within a day of explosion, and rose to peak brightness in ∼10 d. Two distinct phases of circumstellar interaction are evident in the data. The first is marked by a steep blue continuum (T > 15 000 K) with flash-ionisation features due to hydrogen and HēII. The second, weaker phase is marked by a change in the colour evolution accompanied by changes in the shapes and velocities of the spectral line profiles. Narrow P-Cygni profiles (150 km s-1) of HēI further indicate the presence of slow-moving, unshocked material and suggest partial stripping of the progenitor. The fast decline of the light-curve from the peak (3.48 ± 0.26 mag (50 d)-1 in g band) implies that the ejecta mass must be low. Spectroscopically, until +35 d there are similarities with some Type IIb SNe but then there is a transition to spectra that are more reminiscent of an interacting SN II. However, metal lines are largely absent in the spectra, even at epochs of ∼80 d. Its remote location (∼4.6 kpc projected offset) from the presumed host galaxy, a dwarf with MB ∼-14.4 mag, is consistent with our metallicity estimate close to the values of the Small Magellanic Cloud obtained from scaling relations. Furthermore, several lines of evidence (including intrinsic polarisation of p ∼(0.5-1.0)%) point to deviations from spherical symmetry. We suggest that a plausible way of uniting the observational clues is to consider a binary system that underwent case C mass transfer. This failed to remove the entire H envelope of the progenitor before it underwent core collapse. In this scenario, the progenitor itself would be more compact and perhaps straddle the boundary between blue and yellow supergiants, which ties in with the early spectroscopic similarity to Type IIb SNe. © The Authors 2025. |
| 学科主题 | 天文学 ; 恒星与银河系 |
| URL标识 | 查看原文 |
| 资助项目 | N/A |
| 语种 | 英语 |
| 资助机构 | N/A |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/28507]  |
| 专题 | 云南天文台_丽江天文观测站（南方基地） 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.Anton Pannekoek Institute for Astronomy, University of Amsterdam, Amsterdam, 1090 GE, Netherlands 2.INAF Osservatorio Astronomico D Abruzzo, Via Mentore Maggini snc, Teramo, I-64100, Italy; 3.Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, Aarhus C, DK-8000, Denmark; 4.Niels Bohr Institute, University of Copenhagen, Jagtvej 128, København N, 2200, Denmark; 5.Cosmic Dawn Center (DAWN), Niels Bohr Institute, University of Copenhagen, Copenhagen, 2200, Denmark; 6.INAF Osservatorio Astronomico di Padova, Vicolo dell Osservatorio 5, Padova, I-35122, Italy; 7.INAF Osservatorio Astronomico di Brera, Via E. Bianchi 46, (LC), Merate, I23807, Italy; 8.School of Sciences, European University Cyprus, Diogenes Street, Engomi, Nicosia, 1516, Cyprus; 9.IPAC, California Institute of Technology, 1200 E. California Blvd, Pasadena, CA, 91125, United States; 10.Astrophysics Research Institute, Liverpool John Moores University, 146 Brownlow Hill, Liverpool, L3 5RF, United Kingdom; |
| 推荐引用方式 GB/T 7714 | Charalampopoulos, P.,Kotak, R.,Sollerman, J.,et al. Luminous, rapidly declining supernovae as stripped transitional objects in low-metallicity environments: The case of SN 2022lxg[J]. Astronomy and Astrophysics,2025,700. |
| APA | Charalampopoulos, P..,Kotak, R..,Sollerman, J..,Gutiérrez, C. P..,Pursiainen, M..,...&Wold, A..(2025).Luminous, rapidly declining supernovae as stripped transitional objects in low-metallicity environments: The case of SN 2022lxg.Astronomy and Astrophysics,700. |
| MLA | Charalampopoulos, P.,et al."Luminous, rapidly declining supernovae as stripped transitional objects in low-metallicity environments: The case of SN 2022lxg".Astronomy and Astrophysics 700(2025). |
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