DES16C3cje: A low-luminosity, long-lived supernova

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  • C. P. Gutierrez
  • M. Sullivan
  • L. Martinez
  • M. C. Bersten
  • C. Inserra
  • M. Smith
  • J. P. Anderson
  • Y-C Pan
  • A. Pastorello
  • L. Galbany
  • P. Nugent
  • Angus, Charlotte
  • C. Barbarino
  • D. Carollo
  • T-W Chen
  • T. M. Davis
  • M. Della Valle
  • R. J. Foley
  • M. Fraser
  • C. Frohmaier
  • S. Gonzalez-Gaitan
  • M. Gromadzki
  • E. Kankare
  • R. Kokotanekova
  • J. Kollmeier
  • G. F. Lewis
  • M. R. Magee
  • K. Maguire
  • A. Moller
  • N. Morrell
  • M. Nicholl
  • M. Pursiainen
  • J. Sollerman
  • N. E. Sommer
  • E. Swann
  • B. E. Tucker
  • P. Wiseman
  • M. Aguena
  • S. Allam
  • S. Avila
  • E. Bertin
  • D. Brooks
  • E. Buckley-Geer
  • D. L. Burke
  • A. Carnero Rosell
  • M. Carrasco Kind
  • J. Carretero
  • M. Costanzi
  • L. N. da Costa
  • J. De Vicente
  • DES Collaboration

We present DES16C3cje, a low-luminosity, long-lived type II supernova (SN II) at redshift 0.0618, detected by the Dark Energy Survey (DES). DES16C3cje is a unique SN. The spectra are characterized by extremely narrow photospheric lines corresponding to very low expansion velocities of less than or similar to 1500 km s(-1), and the light curve shows an initial peak that fades after 50 d before slowly rebrightening over a further 100 d to reach an absolute brightness of M-r similar to 15.5 mag. The decline rate of the late-time light curve is then slower than that expected from the powering by radioactive decay of Co-56, but is comparable to that expected from accretion power. Comparing the bolometric light curve with hydrodynamical models, we find that DES16C3cje can be explained by either (i) a low explosion energy (0.11 foe) and relatively large Ni-56 production of 0.075 M-circle dot from an similar to 15 M-circle dot red supergiant progenitor typical of other SNe II, or (ii) a relatively compact similar to 40 M-circle dot star, explosion energy of 1 foe, and 0.08 M-circle dot of Ni-56. Both scenarios require additional energy input to explain the late-time light curve, which is consistent with fallback accretion at a rate of similar to 0.5 x 10(-)(8) M-circle dot s(-1).

Original languageEnglish
JournalMonthly Notices of the Royal Astronomical Society
Volume496
Issue number1
Pages (from-to)95-110
Number of pages16
ISSN0035-8711
DOIs
Publication statusPublished - 25 May 2020

    Research areas

  • supernovae: general, supernovae: individual: (DES16C3cje), TIDAL DISRUPTION, PAIR-INSTABILITY, STAR-FORMATION, LIGHT CURVES, LATE TIMES, SN 2005CS, EVOLUTION, FALLBACK, TRANSIENTS, PHOTOMETRY

ID: 271540713