Distribution of Velocity Gradient Orientations: Mapping Magnetization with the Velocity Gradient Technique

Lazarian, A.; Yuen, Ka Ho; Ho, Ka Wai; Chen, Junda; Lazarian, Victor; Lu, Zekun; Yang, Bo; Hu, Yue

doi:10.3847/1538-4357/aad7ff

In this paper, we present an extensive analysis of SN 2021 wuf, a transition between Ia-norm and SN 1991T-like supernovae, which exploded at the periphery of the tidal bridge between the pair galaxy NGC 6500 and NGC 6501, at a redshift ofz = 0.01. Our observations, ranging from −21 to +276 days relative to theB-band maximum light, reveal that SN 2021wuf exhibits properties akin to normal SNe Ia, with a peak absolute magnitude ofM_max(B) ∼ − 19.49 ± 0.10 mag and a post-peak decline rate of Δm₁₅(B) ∼ 1.11 ± 0.06 mag. The peak bolometric luminosity of this SN is estimated as 1.58 × 10⁴³erg s⁻¹, corresponding to a⁵⁶Ni mass ofM_Ni ∼ 0.64 ± 0.05 M_⊙. The spectral features, including high-velocity Si IIλ6355 lines, a plateau in the Si IIλ6355 velocity evolution and the nickel-to-iron ratio in the nebular phase, suggest a potential pulsating delayed detonation mechanism. The absence of intermediate-mass elements in the early phase and the high photospheric temperature, as inferred from the line-strength ratio of Si IIλ5972 to Si IIλ6355 (named asR(Si II)), further support this classification.

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