Early interaction signatures and an extended plateau phase in Type II SN 2020aze
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ID: 313709
2026
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Abstract
Abstract We present a photometric and spectroscopic analysis of the fast-declining Type II SN 2020aze, observed in optical bands from 2.2 to 137.4 days post-explosion. The V-band light curve reaches a peak absolute magnitude of −16.97 ±0.20 mag by 15 days, followed by a recombination phase with a decline rate of 2.04 ± 0.13 mag (100 day)−1, lasting ~120 days. Early spectra (<6.0 day) exhibits a transient weak narrow emission line at 4687 Å and a bump or ledge feature spanning 4400-4800 Å, attributed to narrow and broad blue-shifted He ii λ4686, indicating interaction between the rapidly expanding ejecta and dense circumstellar material (CSM). Spectral comparison with literature models suggests a red supergiant progenitor with a weak wind and a mass-loss rate of ~10−3 M⊙ yr−1. Semi-analytical light curve modelling yields an initial radius of 1100 R⊙, an ejecta mass of 12 M⊙, a total explosion energy of 1.5× 1051 erg, and a progenitor mass of approximately 14 M⊙. The combination of a steep luminosity decline, early interaction signatures, and an unusually extended photospheric phase highlights the complex interplay between pre-SN mass loss, CSM interaction, and progenitor properties, positioning SN 2020aze as an important case for understanding the diversity of Type II SNe.
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| Authors | B Ailawadhi, R Dastidar, K Misra, S Valenti, D J Sand, J E Andrews, J P Anderson, K A Bostroem, P J Brown, R Cartier, T W Chen, Y Dong, N Dukiya, E Padilla Gonzalez, M Gromadzki, J Haislip, D Hiramatsu, D A Howell, C Inserra, D Janzen, S W Jha, V Kouprianov, C McCully, T E Müller-Bravo, C Pellegrino, G Pignata, D E Reichart, J Sollerman, D R Young, L Yadav |
| Journal | monthly notices of the royal astronomical society |
| Year | 2026 |
| DOI |
10.1093/mnras/stag875
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| URL | |
| Keywords | Keywords not found |
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