Optical photometry and spectroscopy of the low-luminosity, broad-lined Ic supernova iPTF15dld
: Pian E, Tomasella L, Cappellaro E, Benetti S, Mazzali PA, Baltay C, Branchesi M, Brocato E, Campana S, Copperwheat C, Covino S, D'Avanzo P, Ellman N, Grado A, Melandri A, Palazzi E, Piascik A, Piranomonte S, Rabinowitz D, Raimondo G, Smartt SJ, Steele IA, Stritzinger M, Yang S, Ascenzi S, Della Valle M, Gal-Yam A, Getman F, Greco G, Inserra C, Kankare E, Limatola L, Nicastro L, Pastorello A, Pulone L, Stamerra A, Stella L, Stratta G, Tartaglia L, Turatto M
Publisher: OXFORD UNIV PRESS
: 2017
: Monthly Notices of the Royal Astronomical Society
: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
: MON NOT R ASTRON SOC
: 466
: 2
: 1848
: 1856
: 9
: 0035-8711
DOI: https://doi.org/10.1093/mnras/stw3247
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 aftermaximum 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 Ni-56, 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-circle dot, produced a Ni-56 mass of similar to 0.1-0.2 M-circle dot, had an ejecta mass of [2-10] M-circle dot, and a kinetic energy of [1-18] x 10(51) erg.
