Luminosity source in supernova ASASSN-15nx with long linear light curve
Abstract
The available spectra of the anomalous supernova ASASSN-15nx permit us to rule out the radioactivity and circumstellar interaction as the luminosity source. I propose an alternative mechanism for the ASASSN-15nx luminosity based on the interaction of the neutron star rotating magnetosphere with the gravitationally bound material of the envelope ejected by the shock wave. In the regime of the stationary accretion the rotational frequency decreases exponentially with time, which could account for the linearity of the light curve. The modelling of the light curve at the stage of the luminosity rise in combination with the expansion velocity implies the low mass of ejecta, ~ 1 M. The profile of the [O\,I] 6300, 6364\,\ doublet indicates the asphericity of the oxygen distribution, which in turn suggests the aspherical explosion.
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