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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 UVspectra are compared to those of other well-observed Type II/IIP SNe, includingthe recently studied Type IIP SN 2021yja. Both SNe exhibit rapid cooling andsimilar evolution during early phases, indicating a common behavior among SNeII. Radiative-transfer modeling of the spectra of SN 2022wsp with the TARDIScode 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 temperaturederived from the modeling agree with the behavior observed from otherpreviously studied cases. The strong suppression of hydrogen Balmer lines inthe spectra suggests interaction with a pre-existing circumstellar environmentcould be occurring at early times. In the SN 2022wsp spectra, the absorptioncomponent 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 modelwithout fine-tuning the parameters, suggesting that the secondary blueward dipis a metal transition that originates in the SN ejecta.

Early-Time Ultraviolet and Optical Hubble Space Telescope Spectroscopy of the Type II Supernova 2022wsp