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 1044 erg s-1, which is higher than the threshold of superluminous SNe (SLSNe). We then use the 56Ni model and the magnetar plus 56Ni 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 56Ni model can account for the photometry of iPTF~16asu, and the peak luminosity of its theoretical bolometric light curve is 1.06× 1044 erg s-1. We suggest that iPTF~16asu and similar SNe (e.g., SN 2018gep) constitute the class of rapidly evolving SLSNe Ic-BL.
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