On the early-time excess emission in hydrogen-poor superluminous supernovae

TL;DR

This paper analyzes early excess emission in hydrogen-poor superluminous supernovae, modeling their light curves to understand explosion mechanisms and the roles of magnetars, shock breakouts, and circumstellar medium interactions.

Contribution

It compares different models, including magnetar and CSM interaction, to explain early excess emission in SLSNe-I, highlighting the diversity of their physical origins.

Findings

Magnetar model fits PTF12dam well but not iPTF13dcc.

Shock breakout plus magnetar model explains iPTF13dcc.

CSM interaction model can fit both supernovae light curves.

Abstract

We present the light curves of the hydrogen-poor superluminous supernovae (SLSNe-I) PTF12dam and iPTF13dcc, discovered by the (intermediate) Palomar Transient Factory. Both show excess emission at early times and a slowly declining light curve at late times. The early bump in PTF12dam is very similar in duration (~10 days) and brightness relative to the main peak (2-3 mag fainter) compared to those observed in other SLSNe-I. In contrast, the long-duration (>30 days) early excess emission in iPTF13dcc, whose brightness competes with that of the main peak, appears to be of a different nature. We construct bolometric light curves for both targets, and fit a variety of light-curve models to both the early bump and main peak in an attempt to understand the nature of these explosions. Even though the slope of the late-time light-curve decline in both SLSNe is suggestively close to that expected from the radioactive decay of $^{56}$Ni and $^{56}$Co, the amount of nickel required to power the full light curves is too large considering the estimated ejecta mass. The magnetar model including an increasing escape fraction provides a reasonable description of the PTF12dam observations. However, neither the basic nor the double-peaked magnetar model is capable of reproducing the iPTF13dcc light curve. A model combining a shock breakout in an extended envelope with late-time magnetar energy injection provides a reasonable fit to the iPTF13dcc observations. Finally, we find that the light curves of both PTF12dam and iPTF13dcc can be adequately fit with the circumstellar medium (CSM) interaction model.