Exceptionally Bright Type Ib Supernova 1991D

Abstract

Photometric and spectroscopic observations of the peculiar Type Ib Supernova 1991D are presented. SN 1991D was exceptionally bright for a Type Ib supernova. The He I lines were rather weak and the velocity at the photosphere as a function of time was unusually low. Comparison of the observed and synthetic spectra indicates that either hydrogen was ejected with a minimum velocity of 12,000 km/s or the spectrum contained features caused by lines of Ne I. Light curve modelling suggests that the progenitor probably had a very large radius (~10^14 cm) and that a considerable amount of 56Ni was synthesized during the explosion (~0.7 Msolar). We suggest a progenitor model of SN 1991D that involves a binary system.

7 pages, 9 figures, MNRAS in press

References in corpus (3)

• Optical Spectroscopy of Type Ib/c Supernovae
• A Comparative Study of the Absolute-Magnitude Distributions of Supernovae
• Direct Analysis of Spectra of Type Ib Supernovae

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