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A High Intrinsic Peculiarity Rate among Type Ia Supernovae

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Li, Weidong, Filippenko, Alexei V., Treffers, Richard R., Riess, Adam G., Hu, Jingyao, Qiu, Yulei·2001·The Astrophysical Journal

Abstract

We have compiled a sample of 45 Type Ia supernovae (SNe Ia) discovered by the Lick Observatory Supernova Search (LOSS) and the Beijing Astronomical Observatory Supernova Survey (BAOSS), and determined the rate of spectroscopically peculiar SNe Ia (i.e., SN 1986G-like, SN 1991bg-like, and SN 1991T-like objects) and the luminosity function of SNe Ia. Because of the nature of the two surveys (distance-limited with small baselines and deep limiting magnitudes), nearly all SNe Ia have been discovered in the sample galaxies of LOSS and BAOSS; thus, the observed peculiarity rate and luminosity function of SNe Ia are intrinsic. We find that 36% ± 9% of nearby SNe Ia are peculiar; specifically, the luminosity function of SNe Ia consists of 20% SN 1991T-like, 64% normal, and 16% SN 1991bg-like objects. We have compared our results to those found by earlier studies, and to those found at high redshift. The apparent dearth of SN 1991T-like objects at high redshift may be due to extinction, and especially to the difficulty of recognizing them from spectra obtained past maximum brightness or from spectra with low signal-to-noise ratios. Implications of the high peculiarity rate for the progenitor systems of SNe Ia are also briefly discussed.

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Metadata

Authors
Li, W., Filippenko, A. V., Treffers, R. R., Riess, A. G., Hu, J., & Qiu, Y.
Venue
The Astrophysical Journal
Published
2001-01-10
Volume
546
Issue
2
Pages
734-743
ISSN
  • 0004-637X (ISSN-L)
  • 1538-4357
OpenAlex
W1968409172
Cited by
213
References
3
FWCI
11.61
Type
journal article
Language
en
Open access
bronze

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CoChat. (2026). Citation check: A High Intrinsic Peculiarity Rate among Type Ia Supernovae. https://app.cochat.ai/papers/10.1086/318299
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Li, W., Filippenko, A. V., Treffers, R. R., Riess, A. G., Hu, J., & Qiu, Y. (2001). A High Intrinsic Peculiarity Rate among Type Ia Supernovae. The Astrophysical Journal. https://doi.org/10.1086/318299

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