SN 2016iyc: A Type IIb supernova arising from a low-mass progenitor

Abstract

In this work, photometric and spectroscopic analyses of a very low-luminosity Type IIb supernova (SN) 2016iyc have been performed. SN 2016iyc lies near the faint end among the distribution of similar supernovae (SNe). Given lower ejecta mass ($M_{\mathrm{ej}}$) and low nickel mass ($M_{\mathrm{Ni}}$) from the literature, combined with SN 2016iyc lying near the faint end, one-dimensional stellar evolution models of 9 - 14 M${}_{\odot }$ zero-age main-sequence (ZAMS) stars as the possible progenitors of SN 2016iyc have been performed using the publicly available code MESA. Moreover, synthetic explosions of the progenitor models have been simulated using the hydrodynamic evolution codes STELLA and SNEC. The bolometric luminosity light curve and photospheric velocities produced through synthetic explosions of ZAMS stars of mass in the range 12 - 13 M${}_{\odot }$ having a pre-supernova radius $R_0=$ (240 - 300) R${}_{\odot }$, with $M_{\mathrm{ej}}=$ (1.89 - 1.93) M${}_{\odot }$, explosion energy $E_{\exp }=$ (0.28 - 0.35) $\times 10^{51}$ erg, and $M_{\mathrm{Ni}}<0.09$ M${}_{\odot }$, are in good agreement with observations; thus, SN 2016iyc probably exploded from a progenitor near the lower mass limits for SNe IIb. Finally, hydrodynamic simulations of the explosions of SN 2016gkg and SN 2011fu have also been performed to compare intermediate- and high-luminosity examples among well-studied SNe IIb. The results of progenitor modelling and synthetic explosions for SN 2016iyc, SN 2016gkg, and SN 2011fu exhibit a diverse range of mass for the possible progenitors of SNe IIb.

arXiv commentFinal updated version. Accepted for publication in MNRAS

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