Light Curve Comparisons of Normal and Peculiar Type Ia Supernovae

Details Light Curve Comparisons of Normal and Peculiar Type Ia Supernovae Light Curve Comparisons of Normal and Peculiar Type Ia Supernovae

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...197.8101s&link_type=abstract

American Astronomical Society, 197th AAS Meeting, #81.01; Bulletin of the American Astronomical Society, Vol. 32, p.1537

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We compare the B-band light curves for 11 normal and 7 peculiar 91T/99aa-like Type Ia supernovae, all found from low-redshift searches. Each was chosen based on two criteria: 1) the SN was spectroscopically identified as either ``normal'' (i.e., resembling SNe 1990N, 1992A, 1992al) or ``peculiar'' (i.e., resembling SN 1991T, or SN 1999aa) either before or near maximum light; 2) the SN light curve was well-sampled, with direct observations periodically obtained from before maximum light to ~80 days after maximum. Each light curve was stretched in the time axis to match a template B curve made from a few very well sampled, spectroscopically normal Type Ia's. A method of least-squares was used to match the stretched curves to the template curve from slightly before peak to +15 days past maximum. The ``average deviation'', as defined by Σ (m(t)-mT(t))/n, between the stretched curve and the template curve was then calculated for each SN. We find that this statistic provides a better measure of the low-order departures from the template curve than does the standard deviation. Nearly all of the stretched curves of the normal Type Ia SNe have a small average deviation about the template curve, while the peculiars are all significantly brighter outside of the fitted region and have a larger range in average deviations. K-S tests show a significant difference between the two distributions. We compare this result to simple light curve models proposed by Clocchiatti & Wheeler (1997), Pinto & Eastman (2000), and Mazzali et al. (2000). Further analysis on a larger sample of normal and peculiar Type Ia's may eventually reduce the multi-parametered light curve models to only a few parameters, and thus a better understanding of the mechanism(s) of Type Ia supernovae.

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