iPTF 16asu Revisited: A Rapidly Evolving Superluminous Broad-Lined Ic Supernova?

Abstract

In this paper, we fit the spectral energy distributions (SEDs) of iPTF 16asu that has so far been classified as a luminous rapidly evolving broad-lined Ic supernova (SN Ic-BL), and re-construct its post-peak bolometric light curve. We find that the luminosity of the post-peak bolometric light curve of iPTF 16asu is about 3 times that of the pseudo-bolometric light curve derived in the literature, and the extrapolated peak luminosity exceeds $\sim 10^{44}$ erg s${}^{-1}$, which is higher than the threshold of superluminous SNe (SLSNe). We then use the ${}^{56}$Ni model and the magnetar plus ${}^{56}$Ni model to fit the multi-band light curves of iPTF 16asu, and construct the theoretical bolometric light curve using the best-fitting theoretical multi-band light curves. We find that the magnetar plus ${}^{56}$Ni model can account for the photometry of iPTF~16asu, and the peak luminosity of its theoretical bolometric light curve is $\sim 1.06\times 10^{44}$ erg s${}^{-1}$. We suggest that iPTF~16asu and similar SNe (e.g., SN 2018gep) constitute the class of rapidly evolving SLSNe Ic-BL.

13 pages, 6 figures, 2 tables, Accepted for publication in ApJ

References in corpus (9)

• Rapidly-Evolving and Luminous Transients from Pan-STARRS1
• The magnetar model for Type I superluminous supernovae I: Bayesian analysis of the full multicolour light curve sample with MOSFiT
• How much 56Ni can be produced in Core-Collapse Supernovae? : Evolution and Explosions of 30 - 100 Msun Stars
• Superluminous Supernovae Powered by Magnetars: Late-time Light Curves and Hard Emission Leakage
• An ultraviolet excess in the superluminous supernova Gaia16apd reveals a powerful central engine
• iPTF16asu: A Luminous, Rapidly-Evolving, and High-Velocity Supernova
• SN2019dge: a Helium-rich Ultra-Stripped Envelope Supernova
• Intermediate Palomar Transient Factory: Realtime Image Subtraction Pipeline
• A Unified Energy-Reservoir Model Containing Contributions from ${}^{56}$Ni and Neutron Stars and Its Implication to Luminous Type Ic Supernovae