Kavli Affiliate: Wendy L. Freedman
| First 5 Authors: M. M. Phillips, M. M. Phillips, , ,
| Summary:
In this paper, the suitability of fast-declining Type Ia supernovae (SNe Ia)
as cosmological standard candles is examined utilizing a Hubble Flow sample of
43 of these objects observed by the Carnegie Supernova Project (CSP). We
confirm previous suggestions that fast-declining SNe Ia offer a viable method
for estimating distances to early-type galaxies when the color-stretch
parameter, $s_BV$, is used as a measure of the light curve shape. As a test,
we employ the Tripp (1998) method, which models the absolute magnitude at
maximum as a function of light curve shape and color. We calibrate the sample
using 12 distance moduli based on published Infrared Surface Brightness
Fluctuations to derive a value of the Hubble constant that is in close
agreement with the value found by Uddin et al. (2024), using the same
methodology, but with the full sample of CSP SNe Ia. We also develop a new and
simple method of estimating the distances of fast decliners only based on their
colors at maximum (and not light curve shape) and find that it has a precision
similar to the Tripp method. This "Color" technique is a powerful tool that is
unique to fast-declining SNe Ia. We show that the colors of the fast decliners
at maximum light are strongly affected by photospheric temperature differences
and not solely due to dust extinction, and provide a physical rationale for
this effect.
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