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arXiv 2205.15596astro-ph.HEastro-ph.SR
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具有早期过量辐射的非常年轻Ia型超新星2019 np的观测

Observations of the Very Young Type Ia Supernova 2019np with Early-excess Emission

Hanna Sai, Xiaofeng Wang, Nancy Elias-Rosa, Yi Yang, Jujia Zhang, Weili Lin, Jun Mo, Anthony L. Piro, Xiangyun Zeng, Reguitti Andrea, Peter Brown, Christopher R… 展开作者

Hanna Sai, Xiaofeng Wang, Nancy Elias-Rosa, Yi Yang, Jujia Zhang, Weili Lin, Jun Mo, Anthony L. Piro, Xiangyun Zeng, Reguitti Andrea, Peter Brown, Christopher R. Burns, Yongzhi Cai, Achille Fiore, Eric Y. Hsiao, Jordi Isern, K. Itagaki, Wenxiong Li, Zhitong Li, Priscila J. Pessi, M. M. Phillips, Stefan Schuldt, Melissa Shahbandeh, Maximilian D. Stritzinger, Lina Tomasella, Christian Vogl, Bo Wang, Lingzhi Wang, Chengyuan Wu, Sheng Yang, Jicheng Zhang, Tianmeng Zhang, Xinghan Zhang

摘要:

来自Ia型超新星(SNe Ia)的早期辐射信号可以对爆炸机制和祖星系统提供重要的约束。我们目前的观测和分析SN 2019 np,一个附近的SN Ia发现在爆炸后1-2天。在光学、紫外和近红外波段进行了后续观测,覆盖了相对于其$B-$波段峰值光度的从$\sim-$ 16.7天到$\sim$ +367.8天的阶段。SN 2019 np的光度和光谱演化类似于正常超新星Ia的平均行为。绝对B波段峰值幅度和峰后下降率分别为$M_{\rm max}(B)=-19.52 \pm 0.47$ mag和$Δm_{\rm15}(B) =1.04 \pm 0.04$ mag。在SN 2019 np的近红外和星云相光谱中没有发现氢线。假设提供光变曲线动力的$^{56}$ Ni位于中心位置,我们发现SN 2019 np的热光变曲线与辐射扩散模型相比,在早期阶段显示出高达5.0%的通量过剩。这种额外的辐射可能表明,除了中心镍的放射性衰变之外,还有一种额外的能量来源。将观测到的颜色演化与不同模型的预测结果进行比较,如SN喷出物与星周物质(CSM)/伴星的相互作用、亚阿布拉塞卡质量白矮星(WD)的双爆轰爆炸和表面$^{56}$ Ni混合,后者更受青睐。

英文摘要:

Early-time radiative signals from type Ia supernovae (SNe Ia) can provide important constraints on the explosion mechanism and the progenitor system. We present observations and analysis of SN 2019np, a nearby SN Ia discovered within 1-2 days after the explosion. Follow-up observations were conducted in optical, ultraviolet, and near-infrared bands, covering the phases from $\sim-$16.7 days to $\sim$+367.8 days relative to its $B-$band peak luminosity. The photometric and spectral evolutions of SN 2019np resembles the average behavior of normal SNe Ia. The absolute B-band peak magnitude and the post-peak decline rate are $M_{\rm max}(B)=-19.52 \pm 0.47$mag and $Δm_{\rm15}(B) =1.04 \pm 0.04$mag, respectively. No Hydrogen line has been detected in the near-infrared and nebular-phase spectra of SN 2019np. Assuming that the $^{56}$Ni powering the light curve is centrally located, we find that the bolometric light curve of SN 2019np shows a flux excess up to 5.0% in the early phase compared to the radiative diffusion model. Such an extra radiation perhaps suggests the presence of an additional energy source beyond the radioactive decay of central nickel. Comparing the observed color evolution with that predicted by different models such as interactions of SN ejecta with circumstellar matter (CSM)/companion star, a double-detonation explosion from a sub-Chandrasekhar mass white dwarf (WD), and surface $^{56}$Ni mixing, the latter one is favored.

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