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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


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 Mmaxg = -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 ± 0.003M⊙. The nebular spectra of SN 2017ivv show a remarkable transformation that allows the evolution to be split into three phases: (1) Ha strong phase (<200 d); (2) Ha weak phase (between 200 and 350 d); and (3) Ha 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 15-17M⊙.

Original languageEnglish
Pages (from-to)974-992
Number of pages19
JournalMonthly Notices of the Royal Astronomical Society
Issue number1
StatePublished - 1 Nov 2020


FundersFunder number
Asteroid Terrestrialimpact Last Alert System
Chinese Academy of Sciences South America Center for Astronomy
European Funds for Regional Development
Instituto de Astrofisica de Canarias
Ministry of Economy, Development, and TourismIC120009
National Astronomical Observatories of China
NationalAstronomical Observatories of China
Science Foundation Ireland University
Swedish National Research Council2018-03799
andTechnology Facilities Council
National Science FoundationAST-0908816, AST-1313484, AST-1908570
National Aeronautics and Space Administration80NSSC18K1575, NN12AR55G, 80NSSC18K0284
W. M. Keck Foundation
Gordon and Betty Moore FoundationGBMF5490
University of California
Ohio State University
Villum Fonden
Horizon 2020 Framework Programme
H2020 Marie Skłodowska-Curie Actions
Seventh Framework Programme839090, 0908816, 615929, 1515927, 842471, 1813176, 803189, 1313484, 758638
College of Arts and Sciences, University of Nebraska-Lincoln
Space Telescope Science InstitutePGC2018-095317-B-C21
Mt. Cuba Astronomical Foundation
Science and Technology Facilities CouncilST/P000312/1
Royal Society
Royal Astronomical Society
European Commission
European Research Council
Queen's University Belfast
Deutsche ForschungsgemeinschaftHA 1850/28-1
Chinese Academy of Sciences
Liverpool John Moores University
Narodowe Centrum Nauki2014/14/A/ST9/00121
Ministry of Finance
Istituto Nazionale di Astrofisica
INAF-Osservatorio Astronomico di Padova
European Regional Development Fund
Fondo Nacional de Desarrollo Científico, Tecnológico y de Innovación TecnológicaAST-1515927, AST-1911074, 1191038, AST-1813176, AST-1907570, AST-181440, AST-1911225, AST-1920392
Centre for Southern Hemisphere Oceans Research0102.A-9099, 0102.D-0356, 0104.D-0503, 0101.A-9099, 0103.D-0393


    • Supernovae: general
    • Surveys
    • Techniques: photometric
    • Techniques: spectroscopic


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