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Superluminous supernova SN 2018ibb: Circumstellar shell and spectral effects
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I explore observational effects of the cirsumstellar gas around superluminous supernova SN~2018ibb. High velocity Fe II narrow absorptions are reproduced in the model of fragmented cold dense shell. Unusual selective absorption in the emission doublet of [O I] is explained as an effect of the radiation scattering in Si II doublet lines in the supernova envelope.The strong emission of [O III] doublet at t_max + 565 days is proposed to originate from the supernova envelope, whereas its asymmetry is explained by the dust formation in the unshocked ejecta. Circumstellar interaction modeling combined with observational data suggests the cirsumstellar shell mass of about 0.14 Msun.
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Cited by 2 Pith papers
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PISN 2018ibb: radioactive emission of [O III] lines
A one-zone radioactive heating model with macroscopic nickel-oxygen mixing reproduces the [O III] luminosity of SN 2018ibb and yields a scaling relation for line strength among PISNe.
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