Ned-allsky

Photometric and spectroscopic analysis of the Type II SN 2020jfo with a short plateau

February 2023 • 2023MNRAS.519..248A

Authors • Ailawadhi, B. • Dastidar, R. • Misra, K. • Roy, R. • Hiramatsu, D. • Howell, D. A. • Brink, T. G. • Zheng, W. • Galbany, L. • Shahbandeh, M. • Arcavi, I. • Ashall, C. • Bostroem, K. A. • Burke, J. • Chapman, T. • Dimple • Filippenko, A. V. • Gangopadhyay, A. • Ghosh, A. • Hoffman, A. M. • Hosseinzadeh, G. • Jennings, C. • Jha, V. K. • Kumar, A. • Karamehmetoglu, E. • McCully, C. • McGinness, E. • Müller-Bravo, T. E. • Murakami, Y. S. • Pandey, S. B. • Pellegrino, C. • Piscarreta, L. • Rho, J. • Stritzinger, M. • Sunseri, J. • Van Dyk, S. D. • Yadav, L.

Abstract • We present high-cadence photometric and spectroscopic observations of SN 2020jfo in ultraviolet and optical/near-infrared bands starting from ~3 to ~434 d after the explosion, including the earliest data with the 10.4-m GTC. SN 2020jfo is a hydrogen-rich Type II SN with a relatively short plateau duration (67.0 ± 0.6 d). When compared to other Type II supernovae (SNe) of similar or shorter plateau lengths, SN 2020jfo exhibits a fainter peak absolute V-band magnitude (MV = -16.90 ± 0.34 mag). SN 2020jfo shows significant Hα absorption in the plateau phase similar to that of typical SNe II. The emission line of stable [Ni II] λ7378, mostly seen in low-luminosity SNe II, is very prominent in the nebular-phase spectra of SN 2020jfo. Using the relative strengths of [Ni II] λ7378 and [Fe II] λ7155, we derive the Ni/Fe production (abundance) ratio of 0.08-0.10, which is ~1.5 times the solar value. The progenitor mass of SN 2020jfo from nebular-phase spectral modelling and semi-analytical modelling falls in the range of 12-15 M. Furthermore, semi-analytical modelling suggests a massive H envelope in the progenitor of SN 2020jfo, which is unlikely for SNe II having short plateaus.

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