Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21343807d&link_type=abstract
American Astronomical Society, AAS Meeting #213, #438.07; Bulletin of the American Astronomical Society, Vol. 41, p.311
Astronomy and Astrophysics
Astronomy
Scientific paper
Before 1991, no subclassification of Type Ia supernova spectra was in use. After the appearance of the strikingly peculiar SN 1991T and SN 1991bg, SN Ia spectra usually were just said to be normal, or SN 1991T-like, or SN 1991bg-like. Eventually a few quantitative spectroscopic parameters were introduced, e.g., (1) v10(Si II), the blueshift at 10 days after maximum light of the strong Si II absorption feature near 6100 Å (Branch & van den Bergh 1993); (2) R(Si II), the ratio of the depths of Si II absorption features near 5750 Å and 6100 Å (Nugent et al. 1995); (3) v-dot, the rate at which the blueshift of the 6100 Å absorption decreases during postmaximum epochs (Benetti et al. 2005), and (4) EWw{Si II}, the equivalent width of a Si II absorption feature near 4000 Å (Arsenijevic et al. 2008). These parameters have their uses, but studies of SNe Ia have shown that the spectroscopic diversity is multidimensional, so no single spectroscopic parameter can provide a fully adequate subclassification. We examine the efficacy of a two parameter classification based on the equivalent widths of the 5750 Å and 6100 Å absorptions. We propose a notation that includes these parameters, for example,
SN 2002bf (BL/11/175), where BL denotes "broad lines", one of the four spectroscopic groups introduced by Branch (2006), and 11 and 175 are the 5750 Å and 6100 Å equivalent widths. Such a purely spectroscopic subclassification, based on a single spectrum obtained within a few days of maximum light, would concisely convey useful information about SN 2002bf much as a spectral type of B2 IV concisely conveys information about Acrux.
Baron Eddie
Branch David
Dang Leeann
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