SN 2024gy: Multi-epoch Spectroscopic Features Suggestive of Delayed Detonation in a Type Ia Supernova
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arXiv
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2025
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| author | Li, Liping Wang, Zhenyu Liu, Jialian Pan, Yu Filippenko, Alexei V. Zhang, Jujia Wang, Xiaofeng Kumar, Brajesh Yang, Yi Brink, Thomas G. Zheng, WeiKang Meng, Xiangcun Wang, Lingzhi Zhao, Zeyi Zhai, Qian Cai, Yongzhi Pignata, Giuliano Chen, Xinlei Zou, Xingzhu Zhao, Jiewei Liu, Xiangkun Liu, Xiaowei Er, Xinzhong Reguitti, A. Rich, R. Michael Rees, Jon M. Croom, Mark A. Caceres, Osmin Itagaki, K. Wang, Bo Bai, Jinming |
| author_facet | Li, Liping Wang, Zhenyu Liu, Jialian Pan, Yu Filippenko, Alexei V. Zhang, Jujia Wang, Xiaofeng Kumar, Brajesh Yang, Yi Brink, Thomas G. Zheng, WeiKang Meng, Xiangcun Wang, Lingzhi Zhao, Zeyi Zhai, Qian Cai, Yongzhi Pignata, Giuliano Chen, Xinlei Zou, Xingzhu Zhao, Jiewei Liu, Xiangkun Liu, Xiaowei Er, Xinzhong Reguitti, A. Rich, R. Michael Rees, Jon M. Croom, Mark A. Caceres, Osmin Itagaki, K. Wang, Bo Bai, Jinming |
| contents | 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 $-19.25 \pm 0.29$ mag and subsequently declines by $Δm_{15}(B) \approx 1.12$ mag, consistent with the luminosity-width relation characteristic of normal SNe Ia. Based on the peak thermal luminosity of $(1.2 \pm 0.3) \times 10^{43}$ erg s$^{-1}$, we estimate that $0.57 \pm 0.14~\rm M_{\odot}$ of $^{56}$Ni 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 $λ$6355 line velocity at the same epoch was significantly lower at $\sim$ 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_01428 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | SN 2024gy: Multi-epoch Spectroscopic Features Suggestive of Delayed Detonation in a Type Ia Supernova Li, Liping Wang, Zhenyu Liu, Jialian Pan, Yu Filippenko, Alexei V. Zhang, Jujia Wang, Xiaofeng Kumar, Brajesh Yang, Yi Brink, Thomas G. Zheng, WeiKang Meng, Xiangcun Wang, Lingzhi Zhao, Zeyi Zhai, Qian Cai, Yongzhi Pignata, Giuliano Chen, Xinlei Zou, Xingzhu Zhao, Jiewei Liu, Xiangkun Liu, Xiaowei Er, Xinzhong Reguitti, A. Rich, R. Michael Rees, Jon M. Croom, Mark A. Caceres, Osmin Itagaki, K. Wang, Bo Bai, Jinming High Energy Astrophysical Phenomena Solar and Stellar Astrophysics 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 $-19.25 \pm 0.29$ mag and subsequently declines by $Δm_{15}(B) \approx 1.12$ mag, consistent with the luminosity-width relation characteristic of normal SNe Ia. Based on the peak thermal luminosity of $(1.2 \pm 0.3) \times 10^{43}$ erg s$^{-1}$, we estimate that $0.57 \pm 0.14~\rm M_{\odot}$ of $^{56}$Ni 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 $λ$6355 line velocity at the same epoch was significantly lower at $\sim$ 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. |
| title | SN 2024gy: Multi-epoch Spectroscopic Features Suggestive of Delayed Detonation in a Type Ia Supernova |
| topic | High Energy Astrophysical Phenomena Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2508.01428 |