Type Ibn Supernovae Show Photometric Homogeneity and Evidence for Two Spectral Subclasses

G. Hosseinzadeh; I. Arcavi; S. Valenti; C. McCully; D. A. Howell; J. Johansson; J. Sollerman; A. Pastorello; S. Benetti; Y. Cao; S. B. Cenko; K. I. Clubb; A. Corsi; G. Duggan; N. Elias–Rosa; Alexei V Filippenko; O. Fox; C. Fremling; A. Horesh; E. Karamehmetoglu; M. M. Kasliwal; G. H. Marion; E. O. Ofek; David J. Sand; F. Taddia; WeiKang Zheng; M. Fraser; A. Gal‐Yam; C. Inserra; Russ R. Laher; Frank J. Masci; Umaa Rebbapragada; S. J. Smartt; K. Smith; M. Sullivan; Jason Surace; P. R. Woźniak

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