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- W2078348210 abstract "The detection of hydrogen in the spectra of Type Ia supernovae is matter of recurrent debates, in that it could provide an important constraint on the nature of the progenitors. Currently, the most robust evidence for hydrogen in spectra of Type Ia supernovae is given by an Hα absorption line measured by Polcaro & Viotti in an early stage spectrum of SN 1990M. Through the analysis of an unpublished spectrum of this object, obtained with the 1.52 m ESO telescope one day after the SN discovery, we show that the claimed Hα detection is originated by an observational bias. Once the subtraction of the parent galaxy background is properly done, no evidence for an Hα absorption is found in the spectrum of SN 1990M. We set a rough upper limit of to the hydrogen abundance in the supernova atmosphere of H/Si ≤ 2 × 10-6." @default.
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- W2078348210 title "Hydrogen in the Spectrum of SN 1990M: No More?" @default.
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- W2078348210 doi "https://doi.org/10.1086/309933" @default.
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