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On The Early-Time Excess Emission in Hydrogen-Poor Superluminous Supernovae

Vreeswijk, PM and Leloudas, G and Gal-Yam, A and De Cia, A and Perley, DA and Quimby, RM and Waldman, R and Sullivan, M and Yan, L and Ofek, EO and Fremling, C and Taddia, F and Sollerman, J and Valenti, S and Arcavi, I and Howell, DA and Filippenko, AV and Cenko, SB and Yaron, O and Kasliwal, MM and Cao, Y and Ben-Ami, S and Horesh, A and Rubin, A and Lunnan, R and Nugent, PE and Laher, R and Rebbapragada, UD and Woźniak, P and Kulkarni, SR (2017) On The Early-Time Excess Emission in Hydrogen-Poor Superluminous Supernovae. The Astrophysical Journal, 835 (1). ISSN 1538-4357

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Abstract

We present the light curves of the hydrogen-poor superluminous supernovae (SLSNe I) PTF 12dam and iPTF 13dcc, 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 PTF 12dam is very similar in duration (∼10 days) and brightness relative to the main peak (2-3 mag fainter) compared to that observed in other SLSNe I. In contrast, the long-duration (>30 days) early excess emission in iPTF 13dcc, 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 decline in the light curves of both SLSNe is suggestively close to that expected from the radioactive decay of 56Ni and 56Co, 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 PTF 12dam observations. However, neither the basic nor the double-peaked magnetar model is capable of reproducing the light curve of iPTF 13dcc. A model combining a shock breakout in an extended envelope with late-time magnetar energy injection provides a reasonable fit to the iPTF 13dcc observations. Finally, we find that the light curves of both PTF 12dam and iPTF 13dcc can be adequately fit with the model involving interaction with the circumstellar medium. © 2017. The American Astronomical Society. All rights reserved.

Item Type: Article
Uncontrolled Keywords: 0201 Astronomical And Space Sciences, 0305 Organic Chemistry, 0306 Physical Chemistry (Incl. Structural)
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Q Science > QD Chemistry
Divisions: Astrophysics Research Institute
Publisher: American Astronomical Society
Date Deposited: 23 May 2017 12:17
Last Modified: 23 May 2017 12:17
DOI or Identification number: 10.3847/1538-4357/835/1/58
URI: http://researchonline.ljmu.ac.uk/id/eprint/6556

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