Optical photometry and spectroscopy of the low-luminosity, broad-lined Ic supernova iPTF15dld

E. Pian, Lina Tomasella, E. Cappellaro, S. Benetti, Paolo A. Mazzali, C. Baltay, M. Branchesi, E. Brocato, S. Campana, C. Copperwheat, S. Covino, P. D'Avanzo, N. Ellman, A. Grado, A. Melandri, E. Palazzi, A. Piascik, S. Piranomonte, D. Rabinowitz, G. RaimondoS. J. Smartt, I. A. Steele, M. Stritzinger, S. Yang, S. Ascenzi, M. Della Valle, A. Gal-Yam, F. Getman, G. Greco, C. Inserra, E. Kankare, L. Limatola, L. Nicastro, A. Pastorello, L. Pulone, A. Stamerra, Luigi Stella, G. Stratta, L. Tartaglia, M. Turatto

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Core-collapse stripped-envelope supernova (SN) explosions reflect the diversity of physical parameters and evolutionary paths of their massive star progenitors. We have observed the Type Ic SN iPTF15dld (z = 0.047), reported by the Palomar Transient Factory. Spectra were taken starting 20 rest-frame days after maximum luminosity and are affected by a young stellar population background. Broad spectral absorption lines associated with the SN are detected over the continuum, similar to those measured for broad-lined, highly energetic SNe Ic. The light curve and maximum luminosity are instead more similar to those of low luminosity, narrow-lined Ic SNe. This suggests a behaviour whereby certain highly stripped-envelope SNe do not produce a large amount of 56Ni, but the explosion is sufficiently energetic that a large fraction of the ejecta is accelerated to higher than usual velocities. We estimate SN iPTF15dld had a main-sequence progenitor of 20-25 M⊙, produced a 56Ni mass of ∼0.1-0.2 M⊙, had an ejecta mass of [2-10] M⊙, and a kinetic energy of [1-18] × 1051 erg.
Original languageEnglish
Pages (from-to)1848-1856
Number of pages9
JournalMonthly Notices of the Royal Astronomical Society
Issue number2
Early online date13 Dec 2016
Publication statusPublished - 2017


  • stars: massive
  • supernovae: individual: iPTF15dld (LSQ15bfp
  • PS15clr)
  • galaxies: starburst


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