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WFST Supernovae in the First Year. II. SN 2024aedt: Systematical Study of a Transitional Type Ia Supernova



Tekijät: Meng, Dezheng; Jiang, Ji-an; Kong, Xu; Xu, Zelin; Maeda, Keiichi; Kuncarayakti, Hanindyo; Galbany, Lluis; Jha, Saurabh W.; Ivezic, Zeljko; Yoachim, Peter; Wu, Weiyu; Liu, Zhengyan; Zhao, Junhan; Connolly, Andrew J.; Jia, Ziqing; Hu, Lei; Ding, Weiyu; Fan, Lulu; Li, Feng; Liang, Ming; Tang, Jinlong; Wan, Zhen; Wang, Hairen; Wang, Jian; Xue, Yongquan; Zhang, Hongfei; Zhao, Wen; Zheng, Xianzhong; Zhu, Qingfeng

Julkaisuvuosi: 2026

Lehti: Astrophysical Journal

Artikkelin numero: 54

Vuosikerta: 1002

Numero: 1

ISSN: 0004-637X

eISSN: 1538-4357

DOI: https://doi.org/10.3847/1538-4357/ae4c87

Julkaisun avoimuus kirjaamishetkellä: Avoimesti saatavilla

Julkaisukanavan avoimuus : Kokonaan avoin julkaisukanava

Verkko-osoite: https://iopscience.iop.org/article/10.3847/1538-4357/ae4c87

Rinnakkaistallenteen osoite: https://research.utu.fi/converis/portal/detail/Publication/523310202

Rinnakkaistallenteen lisenssi: CC BY

Rinnakkaistallennetun julkaisun versio: Kustantajan versio


Tiivistelmä

We present comprehensive photometric and spectroscopic observations of a transitional Type Ia supernova (SN Ia), SN 2024aedt, discovered by the 2.5 m Wide Field Survey Telescope within 1 day of the explosion. Its light curve is characterized by a peak absolute magnitude of MB = −18.49 ± 0.03 mag and a decline rate of Δm15(B) = 1.53 ± 0.36 mag, placing the object on the Δm15(B)–MB diagram in the transition region between normal and subluminous SNe Ia. Furthermore, the early color evolution and host galaxy environment of SN 2024aedt underscore its transitional nature, sharing properties with both normal and SN 1991bg–like SNe Ia. Light-curve modeling with MOSFiT yields a synthesized 56Ni mass of 0.414 ± 0.042 M⊙ and a total ejecta mass of 0.548 ± 0.108 M⊙. A comparison with theoretical models suggests that the evolutionary trend can be broadly explained by both delayed-detonation and double-detonation (DDet) scenarios, while possible early-excess emissions predicted by DDet cannot be identified given the limited detections soon after the SN explosion. Although the overall spectral evolution of SN 2024aedt is similar to that of other transitional SNe Ia, the spectroscopic comparison reveals diversity in the early-phase blue-end features, which becomes more homogeneous at later phases. This result indicates the importance of early-time observations in understanding the origin of SN Ia diversity.


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Julkaisussa olevat rahoitustiedot: 
This work was supported by the National Key R&D Program of China (grant No. 2023YFA1608100), the National Natural Science Foundation of China (grant No. 12393811, 12233008), and the Strategic Priority Research Program of the Chinese Academy of Science (grant No. XDB0550300). J.J. acknowledges support from the Japan Society for the Promotion of Science (JSPS) KAKENHI grants JP22K14069. K.M. acknowledges support from JSPS KAKENHI grants JP24KK0070 and 24H01810. K.M. and H.K. acknowledge support from the JSPS bilateral JPJSBP120229923. L.G. acknowledges financial support from AGAUR, CSIC, MCIN, and AEI 10.13039/501100011033 under projects PID2023-151307NB-I00, PIE 20215AT016, CEX2020-001058-M, ILINK23001, COOPB2304, and 2021-SGR-01270.


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