A High Peculiarity Rate for Type Ia SNe

نویسندگان

  • W. D. Li
  • A. V. Filippenko
  • A. G. Riess
  • J. Y. Hu
  • Y. L. Qiu
چکیده

Type Ia supernovae (SNe Ia) are not perfectly homogeneous. There are peculiar ones: SN 1991T-like (overluminous), SN 1986G-like (subluminous), and SN 1991bg-like (very subluminous) objects. Figure 1 shows a comparison of the spectra of peculiar SNe Ia with that of a relatively normal SN Ia, SN 1994D. The peculiarity rate, however, is not well established. An estimate (less than 10%) by Branch et al. (1993) [1] is limited by the small number of peculiar SNe Ia known at that time. In the past 3 years, a number of peculiar SNe have been discovered in the course of several successful nearby SN surveys, and we try to update the peculiarity rate here.

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تاریخ انتشار 1999