Bibcode
Vinkó, J.; Ordasi, A.; Szalai, T.; Sárneczky, K.; Bányai, E.; Bíró, I. B.; Borkovits, T.; Hegedüs, T.; Hodosán, G.; Kelemen, J.; Klagyivik, P.; Kriskovics, L.; Kun, E.; Marion, G. H.; Marschalkó, G.; Molnár, L.; Nagy, A. P.; Pál, A.; Silverman, J. M.; Szakáts, R.; Szegedi-Elek, E.; Székely, P.; Szing, A.; Vida, K.; Wheeler, J. C.
Bibliographical reference
Publications of the Astronomical Society of the Pacific, Volume 130, Issue 988, pp. 064101 (2018).
Advertised on:
6
2018
Citations
14
Refereed citations
13
Description
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 ≲0.2 mag, and the agreement is even better (≲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 ∼0.1–0.2
mag uncertainty for nearby SNe. Still, there is room for future
improvements to reach the desired ∼0.05 mag accuracy in the absolute
distance modulus.