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• W2775725482 abstract "Magnetar power is believed to be at the origin of numerous super-luminous supernovae (SNe) of Type Ic, arising from compact, hydrogen-deficient, Wolf-Rayet type stars. Here, we investigate the properties that magnetar power would have on standard-energy SNe associated with 15-20Msun blue or red supergiant (BSG/RSG) stars. We use a combination of Eulerian grey radiation-hydrodynamics and non-LTE steady-state radiative transfer to study their dynamical, photometric, and spectroscopic properties. Adopting magnetar fields of 1, 3.5, 7 x 10^14G and rotational energies of 0.4, 1, and 3 x 10^51erg, we produce bolometric light curves with a broad maximum covering 50-150d and a magnitude of 10^43-10^44erg/s. The spectra at maximum light are analogous to those of standard SNe II-P but bluer. Although the magnetar energy is channelled roughly in equal proportion between SN kinetic energy and SN luminosity, the latter may be boosted by a factor 10-100 compared to a standard SN II. This influence breaks the observed relation between brightness and expansion rate of standard Type II SNe. Magnetar energy injection also delays recombination and may even cause re-ionization, with a reversal in photospheric temperature and velocity. Depositing the magnetar energy in a narrow mass shell at the ejecta base leads to the formation of a dense shell at a few 1000km/s, which causes a light-curve bump at the end of the photospheric phase. Depositing this energy over a broad range of mass in the inner ejecta, to mimic the effect of multi-dimensional fluid instabilities, prevents the formation of a dense shell and produces an earlier-rising and smoother light curve. The magnetar influence on the SN radiation is generally not visible prior to 20-30d, during which one may discern a BSG from a RSG progenitor. We propose a magnetar model for the super-luminous Type II SN OGLE-SN14-073." @default.
• W2775725482 created "2017-12-22" @default.
• W2775725482 creator A5008200333 @default.
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• W2775725482 date "2018-05-01" @default.
• W2775725482 modified "2023-09-28" @default.
• W2775725482 title "Super-luminous Type II supernovae powered by magnetars" @default.
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• W2775725482 doi "https://doi.org/10.1051/0004-6361/201732229" @default.
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