标题： SN 2024pxl的 photometry 和光谱学：Ia型超新星之间的亮度联系 显示英文标题

标题： Photometry and Spectroscopy of SN 2024pxl: A Luminosity Link Among Type Iax Supernovae

摘要： 我们展示了附近一颗中间亮度（$M_V = -$16.81$\pm$0.19 mag）的Iax型超新星（SN）2024pxl在紫外到光学波段的光度观测和光学到近红外（NIR）波段的光谱后续观测。 SN 2024pxl表现出比该类别的高亮度成员更快的光变曲线演化，但比低亮度事件慢。根据伪黑体光曲线的分析建模，其观测上很好地约束的上升时间为$\sim$10天，估计合成的$^{56}$镍质量为0.03 M$_\odot$，这与碳氧白矮星弱爆燃模型的预测一致。 我们的SN 2024pxl的光学光谱序列显示弱\ion{Si}{2}线以及与其他高亮度Iax型超新星相似的光谱演化，但也显示出类似低亮度Iax型超新星的早期\ion{C}{2}线。SN 2024pxl的晚期光学光谱与SN 2014dt的非常接近，其近红外光谱演化也与其他已研究的高亮度Iax型超新星相符。 SN 2024pxl的谱线膨胀速度处于Iax型超新星速度分布的低端，铁元素群的速度分布相对于中等质量元素表明喷发物在大尺度上混合，这符合纯爆燃模型的预期。 SN 2024pxl表现出高亮度和低亮度Iax型超新星之间的特征，进一步建立了这一多样化类别之间的联系。 显示英文摘要

摘要： We present extensive ultraviolet to optical photometric and optical to near-infrared (NIR) spectroscopic follow-up observations of the nearby intermediate-luminosity ($M_V = -$16.81$\pm$0.19~mag) Type Iax supernova (SN) 2024pxl in NGC 6384. SN~2024pxl exhibits a faster light curve evolution than the high-luminosity members of this class, and slower than low-luminosity events. The observationally well-constrained rise time of $\sim$10 days and an estimated synthesized $^{56}$Ni mass of 0.03 M$_\odot$, based on analytical modeling of the pseudobolometric light curve, are consistent with models of the weak deflagration of a carbon-oxygen white dwarf. Our optical spectral sequence of SN~2024pxl shows weak \ion{Si}{2} lines and spectral evolution similar to other high-luminosity Type Iax SNe, but also prominent early-time \ion{C}{2} line, like lower-luminosity Type Iax SNe. The late-time optical spectrum of SN~2024pxl closely matches that of SN 2014dt, and its NIR spectral evolution aligns with those of other well-studied, high-luminosity Type Iax SNe. The spectral-line expansion velocities of SN~2024pxl are at the lower end of the Type Iax SN velocity distribution, and the velocity distribution of iron-group elements compared to intermediate-mass elements suggests that the ejecta are mixed on large scales, as expected in pure deflagration models. SN~2024pxl exhibits characteristics intermediate between those of high-luminosity and low-luminosity Type~Iax SNe, further establishing a link across this diverse class.