Mathematics – Logic
Scientific paper
Dec 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...185.3308p&link_type=abstract
American Astronomical Society, 185th AAS Meeting, #33.08; Bulletin of the American Astronomical Society, Vol. 26, p.1362
Mathematics
Logic
Scientific paper
The Calan/Tololo supernova search resulted in the discovery of 30 type Ia supernovae (SNe Ia) during the period 1990-1993. In this paper, we report I-band photometry obtained at CTIO for 16 of these events. The I-band light curves of SNe Ia are potentially important for cosmological studies since 1) the effect of dust extinction is a factor of 2 less (in magnitudes) than in blue light, and 2) the intrinsic dispersion in absolute luminosity is apparently also significantly smaller than in the B or V bands. Recent studies have indicated that the I-band light curves of SNe Ia are characterized by a secondary maximum which occurs ~ 23 days after the primary peak, similar to what has been observed in the J, H, and K bands. Nevertheless, observations of events covering a range of initial decline rates (in B) suggest that there is considerable diversity in the detailed shapes of the I light curves. This is confirmed by the data for the Calan/Tololo supernovae found before primary maximum. In order to derive peak magnitudes for events discovered after maximum, it is therefore necessary to fit the data using several different ``templates'' representative of the range of observed I-band light curve shapes. Using this technique, we have produced an I-band Hubble diagram for the Calan/Tololo SNe Ia. The I-band light curve for SN 1972E is also presented which, combined with the Cepheid distance for its host galaxy (NGC 5253), provides a new and independent estimate of the Hubble constant. Partial support for this research was provided by grant 92/0312 from Fondo Nacional de Ciencias y Tecnologia (FONDECYT--Chile).
Aviles Roberto
Hamuy Mario
Maza Jose
Phillips Marcia
Schommer Robert A.
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