Extended Data Table 2 Log of spectroscopic observations of SN 2020eyj and its host and FWHM velocity measurements of prominent emission lines in the 131 and 251 days Keck spectra

From: A radio-detected type Ia supernova with helium-rich circumstellar material

  1. Phase is relative to the first detection epoch, in the rest frame. The listed velocities are both the FWHM velocities measured from fitting the full line with a Lorentzian line profile as well as twice the half width at half maximum of the blue wing. The latter measurements better represent the true FWHM velocity, because the red wings in the emission lines are strongly attenuated (Extended Data Fig. 3).
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