Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21733711h&link_type=abstract
American Astronomical Society, AAS Meeting #217, #337.11; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
While the spectral features and their phase evolution of the majority of Type Ia supernovae (SNe Ia) are remarkably uniform, the advent of large spectroscopic data sets reveal subtle, but real, diversity among SNe Ia. To understand the origin of the observed variations, we conduct a systematic study of the feature shapes using the technique of principal component analysis (PCA). With the aid of PCA, the multidimensional spectral information is reduced to a few components, quantifying the subtle variations in the feature shape. Using the projections of the data on these principal components, it is shown here that light-curve shape is the main driver of the spectroscopic diversity at maximum light for every spectral feature in the rest-frame optical. The correlation points to composition of the ejecta and temperature which governs the speed of the ionization evolution as the main driver of the variation, while the effects of asymmetry appear to be sub-dominant at this phase. We also employ the same technique to study any differences in the spectroscopic properties between high-redshift and nearby SNe Ia, and also between SNe Ia of a range of host mass.
Conley Alex
Hartwick David A. F.
Howell Dale Andrew
Hsiao Eric
Nugent Peter Edward
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