SN 2020acat: an energetic fast rising Type IIb supernova

Medler, K.; Mazzali, P. A.; Teffs, J.; Ashall, C.; Anderson, J. P.; Arcavi, I.; Benetti, S.; Bostroem, K. A.; Burke, J.; Cai, Y.-Z.; Charalampopoulos, P.; Elias-Rosa, N.; Ergon, M.; Galbany, L.; Gromadzki, M.; Hiramatsu, D.; Howell, D. A.; Inserra, C.; Lundqvist, P.; McCully, C.; Müller-Bravo, T.; Newsome, M.; Nicholl, M.; Gonzalez, E. Padilla; Paraskeva, E.; Pastorello, A.; Pellegrino, C.; Pessi, P. J.; Reguitti, A.; Reynolds, T. M.; Roy, R.; Terreran, G.; Tomasella, L.; Young, D. R.

doi:10.1093/mnras/stac1192

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SN 2020acat: an energetic fast rising Type IIb supernova

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Mazzali, P. A.
Stellar Astrophysics, MPI for Astrophysics, Max Planck Society;

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Citation

Medler, K., Mazzali, P. A., Teffs, J., Ashall, C., Anderson, J. P., Arcavi, I., et al. (2022). SN 2020acat: an energetic fast rising Type IIb supernova. Monthly Notices of the Royal Astronomical Society, 513(4), 5540-5558. doi:10.1093/mnras/stac1192.

Cite as: https://hdl.handle.net/21.11116/0000-000B-581F-1

Abstract

The ultraviolet (UV) and near-infrared (NIR) photometric and optical spectroscopic observations of SN 2020acat covering ∼250 d after explosion are presented here. Using the fast rising photometric observations, spanning from the UV to NIR wavelengths, a pseudo-bolometric light curve was constructed and compared to several other well-observed Type IIb supernovae (SNe IIb). SN 2020acat displayed a very short rise time reaching a peak luminosity of Log₁₀ (L)=42.49±0.17ergs⁻¹ in only ∼14.6 ± 0.3 d. From modelling of the pseudo-bolometric light curve, we estimated a total mass of ⁵⁶Ni synthesized by SN 2020acat of MNi = 0.13 ± 0.03 M_⊙, with an ejecta mass of M_ej = 2.3 ± 0.4 M_⊙ and a kinetic energy of E_k = 1.2 ± 0.3 × 10⁵¹ erg. The optical spectra of SN 2020acat display hydrogen signatures well into the transitional period (≳ 100 d), between the photospheric and the nebular phases. The spectra also display a strong feature around 4900 Å that cannot be solely accounted for by the presence of the Fe ii 5018 line. We suggest that the Fe ii feature was augmented by He i 5016 and possibly by the presence of N ii 5005. From both photometric and spectroscopic analysis, we inferred that the progenitor of SN 2020acat was an intermediate-mass compact star with an M_ZAMS of 15–20 M_⊙.