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Super-luminous supernovae: 56Ni power versus magnetar radiation

Abstract : Much uncertainty surrounds the origin of superluminous supernovae (SNe). Motivated by the discovery of the Type Ic SN 2007bi, we study its proposed association with a pair-instability SN (PISN). We compute stellar evolution models for primordial ˜200 M⊙ stars, simulating the implosion/explosion due to the pair-production instability, and use them as inputs for detailed non-local thermodynamic equilibrium time-dependent radiative transfer simulations that include non-local energy deposition and non-thermal processes. We retrieve the basic morphology of PISN light curves from red supergiant, blue supergiant and Wolf-Rayet (WR) star progenitors. Although we confirm that a progenitor 100 M⊙ helium core (PISN model He100) fits well the SN 2007bi light curve, the low ratios of its kinetic energy and 56Ni mass to the ejecta mass, similar to standard core-collapse SNe, conspire to produce cool photospheres, red spectra subject to strong line blanketing and narrow-line profiles, all conflicting with SN 2007bi observations. He-core models of increasing 56Ni-to-ejecta mass ratio have bluer spectra, but still too red to match SN 2007bi, even for model He125 - the effect of 56Ni heating is offset by the associated increase in blanketing. In contrast, the delayed injection of energy by a magnetar represents a more attractive alternative to reproduce the blue, weakly blanketed and broad-lined spectra of superluminous SNe. The extra heat source is free of blanketing and is not explicitly tied to the ejecta. Experimenting with an ˜9 M⊙ WR-star progenitor, initially exploded to yield an ˜1.6 B SN Ib/c ejecta but later influenced by tunable magnetar-like radiation, we produce a diversity of blue spectral morphologies reminiscent of SN 2007bi, the peculiar Type Ib SN 2005bf and superluminous SN 2005ap-like events.
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Contributor : Danielle Cristofol <>
Submitted on : Tuesday, September 24, 2013 - 3:21:03 PM
Last modification on : Friday, November 6, 2020 - 9:34:05 AM

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L. Dessart, D. J. Hillier, R. Waldman, E. Livne, S. Blondin. Super-luminous supernovae: 56Ni power versus magnetar radiation. Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P - Oxford Open Option A, 2012, 426, pp.L76-L80. ⟨10.1111/j.1745-3933.2012.01329.x⟩. ⟨in2p3-00865545⟩



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