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

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish
Pages (from-to)248-270
Number of pages23
JournalMonthly Notices of the Royal Astronomical Society
Issue number1
StatePublished - 1 Feb 2023


  • galaxies: individual: M61
  • supernovae: general
  • supernovae: individual: SN 2020jfo
  • techniques: photometric
  • techniques: spectroscopic


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