Light Curves of Hydrogen-poor Superluminous Supernovae from the Palomar Transient Factory

• DOI: 10.3847/1538-4357/aab9b6
• Publication Date: 2018-06-15T12:13:26Z
• Authors: Annalisa De Cia; A. Gal-Yam; A. Rubin; G. Leloudas; P. Vreeswijk; D. A. Perley; R. Quimby; Lin Yan; M. Sullivan; A. Flörs; J. Sollerman; D. Bersier; S. B. Cenko; M. Gal-Yam; K. Maguire; E. O. Ofek; S. Prentice; S. Schulze; J. Spyromilio; S. Valenti; I. Arcavi; A. Corsi; D. A. Howell; P. Mazzali; M. M. Kasliwal; F. Taddia; O. Yaron
• Keywords: Magnetar; Radioactive decay; Absolute magnitude

We investigate the light-curve properties of a sample 26 spectroscopically confirmed hydrogen-poor superluminous supernovae (SLSNe-I) in Palomar Transient Factory (PTF) survey. These events are brighter than SNe Ib/c and Ic-BL, on average, by about 4 2~mag, respectively. The peak absolute magnitudes SLSNe-I rest-frame $g$ band span $-22\lesssim M_g \lesssim-20$~mag, these peaks not powered radioactive $^{56}$Ni, unless strong asymmetries at play. rise timescales longer for SLSNe normal Ib/c, roughly 10 days, with similar decay times. Thus, can be considered as separate population based photometric properties. After peak, wide range slopes, no obvious gap between rapidly declining slowly events. latter show more irregularities (bumps) light curves all At late times, SLSN-I slow down cluster around $^{56}$Co rate. Powering late-time would require 1 10${\rm M}_\odot$ Ni masses. Alternatively, simple magnetar model reasonably fit majority curves, four exceptions, mimic $^{56}$Co, up to $\sim400$ days from explosion. resulting spin values do correlate host-galaxy metallicities. Finally, analysis our cannot strengthen case using cosmology.