SN 2017ivv: two years of evolution of a transitional Type II supernova

C P Gutiérrez, A Pastorello, A Jerkstrand, L Galbany, M Sullivan, J P Anderson, S Taubenberger, H Kuncarayakti, S González-Gaitán, P Wiseman, C Inserra, M Fraser, K Maguire, S Smartt, T E Müller-Bravo, I Arcavi, S Benetti, D Bersier, S Bose, K A BostroemJ Burke, P Chen, T-W Chen, M Della Valle, Subo Dong, A Gal-Yam, M Gromadzki, D Hiramatsu, T W-S Holoien, G Hosseinzadeh, D A Howell, E Kankare, C S Kochanek, C McCully, M Nicholl, G Pignata, J L Prieto, B Shappee, K Taggart, L Tomasella, S Valenti, D R Young

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2 Citations (Scopus)


ABSTRACT We present the photometric and spectroscopic evolution of the Type II supernova (SN II) SN 2017ivv (also known as ASASSN-17qp). Located in an extremely faint galaxy (Mr = −10.3 mag), SN 2017ivv shows an unprecedented evolution during the 2 yr of observations. At early times, the light curve shows a fast rise (∼6−8 d) to a peak of ${\it M}^{\rm max}_{g}= -17.84$ mag, followed by a very rapid decline of 7.94 ± 0.48 mag per 100 d in the V band. The extensive photometric coverage at late phases shows that the radioactive tail has two slopes, one steeper than that expected from the decay of 56Co (between 100 and 350 d), and another slower (after 450 d), probably produced by an additional energy source. From the bolometric light curve, we estimated that the amount of ejected 56Ni is ∼0.059 ± 0.003 M⊙. The nebular spectra of SN 2017ivv show a remarkable transformation that allows the evolution to be split into three phases: (1) Hα strong phase (<200 d); (2) Hα weak phase (between 200 and 350 d); and (3) Hα broad phase (>500 d). We find that the nebular analysis favours a binary progenitor and an asymmetric explosion. Finally, comparing the nebular spectra of SN 2017ivv to models suggests a progenitor with a zero-age main-sequence mass of 15–17 M⊙.
Original languageEnglish
Pages (from-to)974-992
Number of pages19
JournalMonthly Notices of the Royal Astronomical Society
Issue number1
Publication statusPublished - Sept 2020


  • Astronomy and Astrophysics
  • Space and Planetary Science


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