SN 2021wuf: A transitional type Ia supernova with a low-velocity gradient
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 of z = 0.01. Our observations, ranging from −21 to +276 days relative to the B -band maximum light, reveal that SN 2021wuf exhibits properties akin to normal SNe Ia, with a peak absolute magnitude of M max ( B ) ∼ − 19.49 ± 0.10 mag and a post-peak decline rate of Δ m 15 ( B ) ∼ 1.11 ± 0.06 mag. The peak bolometric luminosity of this SN is estimated as 1.58 × 10 43 erg s −1 , corresponding to a 56 Ni mass of M Ni ∼ 0.64 ± 0.05 M ⊙ . The spectral features, including high-velocity Si II λ 6355 lines, a plateau in the Si II λ 6355 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 II λ 5972 to Si II λ 6355 (named as R (Si II )), further support this classification.
Authors
- Jujia Zhang (ORCID: https://orcid.org/0000-0002-8296-2590)
- Sarah Bird (ORCID: https://orcid.org/0000-0002-5469-5149)
- Jialian Liu (ORCID: https://orcid.org/0009-0000-0314-6273)
- Abdusamatjan Iskandar (ORCID: https://orcid.org/0009-0003-9229-9942)
- Sai Li (ORCID: https://orcid.org/0009-0009-3246-8728)
- C. McCully (ORCID: https://orcid.org/0000-0001-5807-7893)
- Ali Esamdin (ORCID: https://orcid.org/0000-0003-1845-4900)
- Tianmeng Zhang (ORCID: https://orcid.org/0000-0002-8531-5161)
- Lifan Wang (ORCID: https://orcid.org/0000-0001-7092-9374)
- Xiaofeng Wang (ORCID: https://orcid.org/0000-0002-7334-2357)
- Junjie Zhang (ORCID: https://orcid.org/0000-0003-3425-2794)
- Yangyang Li (ORCID: https://orcid.org/0009-0006-0058-6015)
- K. Azaleee Bostroem
- Xiangyun Zeng
Institutions
- Las Cumbres Observatory Global Telescope Network (US)
- University of California, Santa Barbara (US)
- China Three Gorges University (CN)
- Chinese Academy of Sciences (CN)
- Shanghai Normal University (CN)
- Beijing Planetarium (CN)
- Xinjiang Astronomical Observatory (CN)
- Yunnan Observatories (CN)
- Mitchell Institute (US)
- Université Bourgogne Franche-Comté (FR)
- National Astronomical Observatories (CN)
- University of Chinese Academy of Sciences (CN)
- Texas A&M University (US)
- Tsinghua University (CN)
Publication Details
- Journal
- Astronomy and Astrophysics
- Published
- 2024-09-10
- DOI
- https://doi.org/10.1051/0004-6361/202451048
- Citations
- 3
- Primary Topic
- Gamma-ray bursts and supernovae
- Type
- article
- Field-Weighted Citation Impact
- 0.99
Funders
- National Aeronautics and Space Administration
- National Natural Science Foundation of China