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Optical Light Curves of the Type I[CLC]a[/CLC] Supernovae SN 1990N and SN 1991T

1998; Institute of Physics; Volume: 115; Issue: 1 Linguagem: Inglês

10.1086/300175

1538-3881

P. Lira, N. B. Suntzeff, M. M. Phillips, M. Hamuy, J. Maza, R. A. Schommer, R. C. Smith, L. A. Wells, R. Avilés, J. A. Baldwin, J. H. Elias, L. González, Andrew C. Layden, Mauricio Navarrete, P. Ugarte, A. R. Walker, G. M. Williger, F. K. Baganoff, Arlin Crotts, R. Michael Rich, Neil deGrasse Tyson, Arjun Dey, Puragra Guhathakurta, J. E. Hibbard, Y.-C. Kim, D. Rehner, E. D. Siciliano, Joshua Roth, Patrick Seitzer, T. B. Williams,

Gamma-ray bursts and supernovae

We present UBVRI light curves for the bright Type Ia supernovae SN 1990N in NGC 4639 and SN 1991T in NGC 4527, based on photometry gathered in the course of the Calán/Tololo supernova program. Both objects have well-sampled light curves starting several days before maximum light and spanning well through the exponential tail. These data supersede the preliminary photometry published by Leibundgut et al. and Phillips et al. The host galaxies for these supernovae have (or will have) accurate distances based on the Cepheid period-luminosity relationship. The photometric data in this paper provide template curves for the study of the general population of Type Ia supernovae and accurate photometric indices, needed for the Cepheid-supernova distance scale.