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SN 2024gy: Multiepoch Spectroscopic Features Suggestive of Delayed Detonation in a Type Ia Supernova

文献类型：期刊论文

作者Li LP(李丽萍)5,7,17; Wang ZY(王振宇)7,19; Liu, Jialian9; Pan, Yu10,11; Filippenko, Alexei V.12; Zhang JJ(张居甲)5,7,17; Wang, Xiaofeng9; Kumar, Brajesh10,11; Yang, Yi9; Brink, Thomas G.12
刊名ASTROPHYSICAL JOURNAL
出版日期2026
卷号996期号:1
ISSN号0004-637X
DOI10.3847/1538-4357/ae1ba0
产权排序第1完成单位
文献子类Article
英文摘要We present photometric and spectroscopic observations of SN 2024gy, a Type Ia supernova (SN Ia) exhibiting high-velocity features (HVFs) in its early-time spectra. This SN reaches a peak B-band magnitude of -19.25 +/- 0.29 mag and subsequently declines by Delta m15(B) approximate to 1.12 mag, consistent with the luminosity-width relation characteristic of normal SNe Ia. Based on the peak thermal luminosity of (1.2 +/- 0.3) x 1043 erg s-1, we estimate that 0.57 +/- 0.14 M circle dot of 56Ni was synthesized during the explosion. Our dense early spectral monitoring revealed significant velocity disparities within the ejecta. Notably, absorption features from the Ca ii near-infrared triplet were observed at velocities exceeding 25,000 km s-1, while the Si ii lambda 6355 line velocity at the same epoch was significantly lower at similar to 16,000 km s-1. This velocity disparity likely reflects distinct ionization states of intermediate-mass elements in the outermost layers. The prominent Ca ii HVFs may originate from ionization suppression within the highest-velocity ejecta, potentially indicative of minimal hydrogen mixing in a delayed-detonation explosion scenario. Additionally, the Ni/Fe ratio derived from the nebular spectrum of SN 2024gy provides further support for this model.
学科主题天文学 ; 恒星与银河系
URL标识查看原文
出版地No.2 The Distillery, Glassfields, Avon Street, Bristol, ENGLAND
WOS关键词HIGH-VELOCITY FEATURES ; NEAR-INFRARED OBSERVATIONS ; HUBBLE-SPACE-TELESCOPE ; CIRCUMSTELLAR MATERIAL ; OPTICAL OBSERVATIONS ; IMPROVED DISTANCES ; SODIUM-ABSORPTION ; SPECTRA ; ULTRAVIOLET ; EXPLOSION
资助项目National Key R&D Program of China[2021YFA1600404]; National Key R&D Program of China[2024YFA1611603]; B-type Strategic Priority Program of the Chinese Academy of Sciences[XDB1160202]; National Natural Science Foundation of China (NSFC grants)[12173082]; National Natural Science Foundation of China (NSFC grants)[12333008]; National Natural Science Foundation of China (NSFC grants)[12225304]; Yunnan Fundamental Research Projects (YFRP)[202501AV070012]; Yunnan Fundamental Research Projects (YFRP)[202401BC070007]; Yunnan Fundamental Research Projects (YFRP)[202201AT070069]; Yunnan Fundamental Research Projects (YFRP)[202501AS070005]; Yunnan Fundamental Research Projects (YFRP)[202401AU070063]; Yunnan Fundamental Research Projects (YFRP)[202501AS070078]; Top-notch Young Talents Program of Yunnan Province; Light of West China Program by the Chinese Academy of Sciences (CAS); International Centre of Supernovae, Yunnan Key Laboratory[202302AN360001]; National Natural Science Foundation of China (NSFC)[12288102]; National Natural Science Foundation of China (NSFC)[12033003]; National Natural Science Foundation of China (NSFC)[11633002]; National Natural Science Foundation of China (NSFC)[12573050]; National Natural Science Foundation of China (NSFC)[12303054]; Tencent Xplorer Prize; People's Government of Yunnan Province; Christopher R. Redlich Fund; Chinese Academy of Sciences South America Center for Astronomy (CASSACA) Key Research Project[E52H540301]; Yunnan University Development Plan for World-Class University; Chinese Academy of Sciences (CAS); Yunnan University Development Plan for World-Class Astronomy Discipline; Special Project for High-End Foreign Experts; W. M. Keck Foundation; Yunnan Province; Key Laboratory of Survey Science of Yunnan Province[202449CE340002]; CAS South America Center for Astronomy (CASSACA) Key Research Project[E52H540301]; GRAWITA Large Program Grant; PRIN-INAF 2022; McNair Research Scholars Program
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:001644555700001
出版者IOP Publishing Ltd
资助机构National Key R&D Program of China[2021YFA1600404, 2024YFA1611603] ; B-type Strategic Priority Program of the Chinese Academy of Sciences[XDB1160202] ; National Natural Science Foundation of China (NSFC grants)[12173082, 12333008, 12225304] ; Yunnan Fundamental Research Projects (YFRP)[202501AV070012, 202401BC070007, 202201AT070069, 202501AS070005, 202401AU070063, 202501AS070078] ; Top-notch Young Talents Program of Yunnan Province ; Light of West China Program by the Chinese Academy of Sciences (CAS) ; International Centre of Supernovae, Yunnan Key Laboratory[202302AN360001] ; National Natural Science Foundation of China (NSFC)[12288102, 12033003, 11633002, 12573050, 12303054] ; Tencent Xplorer Prize ; People's Government of Yunnan Province ; Christopher R. Redlich Fund ; Chinese Academy of Sciences South America Center for Astronomy (CASSACA) Key Research Project[E52H540301] ; Yunnan University Development Plan for World-Class University ; Chinese Academy of Sciences (CAS) ; Yunnan University Development Plan for World-Class Astronomy Discipline ; Special Project for High-End Foreign Experts ; W. M. Keck Foundation ; Yunnan Province ; Key Laboratory of Survey Science of Yunnan Province[202449CE340002] ; CAS South America Center for Astronomy (CASSACA) Key Research Project[E52H540301] ; GRAWITA Large Program Grant ; PRIN-INAF 2022 ; McNair Research Scholars Program
版本出版稿
源URL[http://ir.ynao.ac.cn/handle/114a53/28807]  
专题云南天文台_大样本恒星演化研究组
通讯作者Zhang JJ(张居甲)
作者单位1.INAF - Osservatorio Astronomico di Padova, Vicolo dell’Osservatorio 5, 35122 Padova, Italy;
2.INAF-Osservatorio Astronomico di Brera, Via E. Bianchi 46, 23807 Merate (LC), Italy;
3.Dept. of Physics and Astronomy, University of California, Los Angeles, CA 90095-1547, USA;
4.UCO/Lick Observatory, Mount Hamilton, CA 95140, USA;
5.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650216, People’s Republic of China;
6.NASA (retired), Hampton, VA 23681, USA​;
7.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650216, People’s Republic of China; jujia@ynao.ac.cn, wangbo@ynao.ac.cn, baijinming@ynao.ac.cn;
8.Itagaki Astronomical Observatory, Yamagata 990-2492, Japan
9.Physics Department, Tsinghua University, Beijing 100084, People’s Republic of China;
10.South-Western Institute for Astronomy Research (SWIFAR), Yunnan University, Kunming, Yunnan 650500, People’s Republic of China;
推荐引用方式
GB/T 7714		 Li LP,Wang ZY,Liu, Jialian,et al. SN 2024gy: Multiepoch Spectroscopic Features Suggestive of Delayed Detonation in a Type Ia Supernova[J]. ASTROPHYSICAL JOURNAL,2026,996(1).
APA 李丽萍.,王振宇.,Liu, Jialian.,Pan, Yu.,Filippenko, Alexei V..,...&白金明.(2026).SN 2024gy: Multiepoch Spectroscopic Features Suggestive of Delayed Detonation in a Type Ia Supernova.ASTROPHYSICAL JOURNAL,996(1).
MLA 李丽萍,et al."SN 2024gy: Multiepoch Spectroscopic Features Suggestive of Delayed Detonation in a Type Ia Supernova".ASTROPHYSICAL JOURNAL 996.1(2026).

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来源：云南天文台

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