II型超新星2022wsp的早期紫外与光学哈勃空间望远镜光谱
Early-Time Ultraviolet and Optical Hubble Space Telescope Spectroscopy of the Type II Supernova 2022wsp
AI总结：
本文利用HST/STIS早期紫外与光学光谱结合TARDIS辐射转移建模研究II型超新星2022wsp，揭示其陡峭密度剖面、超太阳金属丰度、高消光及可能的星周相互作用，并解释Mg II双槽特征源于抛射物金属跃迁。
摘要：
我们报告了由哈勃空间望远镜（HST）/STIS在爆炸后约10天和20天获得的年轻、邻近的II型超新星（SN）2022wsp的早期紫外（UV）和光学光谱。将SN 2022wsp的紫外光谱与其他被充分观测的II型/IIP型超新星的光谱进行了比较，包括最近研究的IIP型超新星SN 2021yja。这两颗超新星在早期阶段都表现出快速冷却和相似的演化，表明II型超新星之间存在共同行为。使用TARDIS代码对SN 2022wsp光谱进行的辐射转移建模表明，抛射物外层具有陡峭的径向密度分布、超太阳金属丰度以及相对较高的总消光E(B-V) = 0.35 mag。由建模推导出的光球速度和温度的早期演化与先前研究的其他案例中观测到的行为一致。光谱中氢巴耳末线的强烈抑制表明，早期可能与预先存在的星周环境发生相互作用。在SN 2022wsp的光谱中，Mg II P Cygni轮廓的吸收分量在第+10天显示出双槽特征，到第+20天时消失。该形状在未对参数进行微调的情况下被模型很好地再现，表明次级蓝移凹陷是源自超新星抛射物的金属跃迁。
英文摘要：
We report early-time ultraviolet (UV) and optical spectroscopy of the young, nearby Type II supernova (SN) 2022wsp obtained by the Hubble Space Telescope (HST)/STIS at about 10 and 20 days after the explosion. The SN 2022wsp UV spectra are compared to those of other well-observed Type II/IIP SNe, including the recently studied Type IIP SN 2021yja. Both SNe exhibit rapid cooling and similar evolution during early phases, indicating a common behavior among SNe II. Radiative-transfer modeling of the spectra of SN 2022wsp with the TARDIS code indicates a steep radial density profile in the outer layer of the ejecta, a supersolar metallicity, and a relatively high total extinction of E(B-V) = 0.35 mag. The early-time evolution of the photospheric velocity and temperature derived from the modeling agree with the behavior observed from other previously studied cases. The strong suppression of hydrogen Balmer lines in the spectra suggests interaction with a pre-existing circumstellar environment could be occurring at early times. In the SN 2022wsp spectra, the absorption component of the Mg II P Cygni profile displays a double-trough feature on day +10 that disappears by day +20. The shape is well reproduced by the model without fine-tuning the parameters, suggesting that the secondary blueward dip is a metal transition that originates in the SN ejecta.
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