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

Pian, E., Tomasella, L., Cappellaro, E., Benetti, S., Mazzali, P. A., 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, S. J., Steele, I. A., Stritzinger, M., Yang, S., Ascenzi, S., Della Valle, M., Gal-Yam, A., Getman, F., Greco, G., Inserra, C. ORCID:, Kankare, E., Limatola, L., Nicastro, L., Pastorello, A., Pulone, L., Stamerra, A., Stella, L., Stratta, G., Tartaglia, L. and Turatto, M. 2017. Optical photometry and spectroscopy of the low-luminosity, broad-lined Ic supernova iPTF15dld. Monthly Notices of the Royal Astronomical Society 466 (2) , pp. 1848-1856. 10.1093/mnras/stw3247

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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.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Publisher: Oxford University Press
ISSN: 0035-8711
Date of First Compliant Deposit: 23 January 2019
Date of Acceptance: 9 December 2016
Last Modified: 05 May 2023 18:33

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