AI 中文总结
该研究对首个空间分辨强透镜超亮超新星SN 2025wny开展光谱时间延迟测量，得到高精度延迟值，结合透镜模型测得哈勃常数，为透镜超新星时间延迟测量提供新途径。
AI 中文摘要
我们呈现了空间分辨光谱，并推断了红移z=2.015的强引力透镜超亮超新星（SLSN）SN 2025wny多个像之间的时间延迟。SN 2025wny是首个已知的空间分辨强透镜超亮超新星，为通过超新星光谱的时间演化测量透镜延迟提供了独特机会。我们提供了跨越数月的光谱数据集，包含像A、B、C、D和E的空间分辨光谱。我们使用高斯过程建模识别并测量光谱特征的波长演化。通过联合拟合光谱特征的时间演化，推断出时间延迟：Δt_AB=-10.3±2.3天、Δt_AC=0.1±3.6天、Δt_AD=-65.7±3.5天、Δt_AE=3.7±8.8天（均为68%置信区间）。这些是迄今为止通过光谱或测光方法获得的透镜超新星最精确的时间延迟测量结果之一，其中最长的延迟（Δt_AD）约束尤为良好，精度约为5%。结合Mörtsell等人（2026）提出的透镜模型，这些光谱时间延迟给出哈勃常数H₀=70.2⁺⁸.²₋₆.¹ km/s/Mpc。我们的分析表明，光谱演化为透镜超新星系统的时间延迟测量提供了独立且互补的途径，避免了仅依赖测光光变曲线的情况。随着未来巡天发现更大样本的透镜超新星，光谱时间延迟测量将为精确宇宙学提供重要途径。
英文摘要
We present spatially resolved spectra and infer the time-delays between the multiple images of the strongly gravitationally lensed superluminous supernova (SLSN) 2025wny at z=2.015. SN 2025wny is the first known spatially resolved strongly lensed SLSN and provides a unique opportunity to measure lensing delays through the temporal evolution of supernova spectra. We present a spectroscopic dataset spanning several months, including spatially resolved spectra of images A, B, C, D, and E. We identify and measure the wavelength evolution of spectral features using Gaussian-process modeling. The time delays are inferred by jointly fitting the temporal evolution of the spectral features, yielding $Δt_{AB}=-10.3 \pm 2.3$, $Δt_{AC}=0.1 \pm 3.6$, $Δt_{AD}=-65.7 \pm 3.5$, and $Δt_{AE}=3.7 \pm 8.8$ days (68% confidence intervals). These are the among most precise time-delay measurements obtained for a lensed supernova to date, whether from spectroscopic or photometric methods. The longest delay ($Δt_{AD}$) is particularly well constrained, with a ~5% precision. Combined with the lens model presented by Mörtsell et al. (2026), the spectroscopic time-delays give a Hubble constant $H_0 = 70.2^{+8.2}_{-6.1}$ km/s/Mpc. Our analysis demonstrates that spectroscopic evolution provides an independent and complementary route to time-delay measurements in lensed supernova systems, avoiding reliance on photometric light curves alone. As future surveys discover larger samples of lensed supernovae, spectroscopic time-delay measurements will provide an important avenue for precision cosmography.
CommentsSubmitted to the ApJ Focus Issue on SN 2025wny (Paper III)
