Absolute Distances to Nearby Type Ia Supernovae via Light Curve Fitting Methods

Vinkó, József and Ordasi, A. and Szalai, Tamás and Sarneczky, K. and Banyai, E. and Klagyivik, Péter and Kun, Emma and Marschalkó, Gábor and Nagy, Andrea and Székely, Péter (2018) Absolute Distances to Nearby Type Ia Supernovae via Light Curve Fitting Methods. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC, 130 (988). 064101. ISSN 0004-6280

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Abstract

We present a comparative study of absolute distances to a sample of very nearby, bright Type Ia supernovae (SNe) derived from high cadence, high signal-to-noise, multi-band photometric data. Our sample consists of four SNe: 2012cg, 2012ht, 2013dy and 2014J. We present new homogeneous, high-cadence photometric data in Johnson-Cousins BVRI and Sloan g' r' i' z' bands taken from two sites (Piszkesteto and Baja, Hungary), and the light curves are analyzed with publicly available light curve fitters (MLCS2k2, SNooPy2 and SALT2.4). When comparing the best-fit parameters provided by the different codes, it is found that the distance moduli of moderately reddened SNe Ia agree within less than or similar to 0.2 mag, and the agreement is even better (less than or similar to 0.1 mag) for the highest signal-to-noise BVRI data. For the highly reddened SN 2014J the dispersion of the inferred distance moduli is slightly higher. These SN-based distances are in good agreement with the Cepheid distances to their host galaxies. We conclude that the current state-of-the-art light curve fitters for Type Ia SNe can provide consistent absolute distance moduli having less than similar to 0.1-0.2 mag uncertainty for nearby SNe. Still, there is room for future improvements to reach the desired similar to 0.05 mag accuracy in the absolute distance modulus.

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