Estimate of the parameters of the lightcurves

Table 10.2 has the result of the adjustments of the lightcurves of Nos three supernovæ.

Table 10.2: Paramétres of the lightcurvess of the supernovæ 2000fr, 2001gn and 2001hb

Sn	$U_{Max}^{corr}$	$B^{corr}_{Max}$	$s_U$	$A_V$	$A_R$	$K_{UV}$	$K_{RB}$
2000fr	22.66 (0.03)	23.04 (0.03)	0.99 (0.01)	0.09 (0.01)	0.07 (0.01)	-0.30 (0.02)	0.68 (0.02)
Sn	$U_{Max}^{corr}$	$B^{corr}_{Max}$	$s_U$	$A_I$	$A_Z$	$K_{UI}$	$K_{ZB}$
2001gn	25.15 (0.07)	25.00 (0.11)	0.91 (0.08)	0.05 (0.01)	0.04 (0.01)	0.79 (0.02)	1.46 (0.02)
2001hb	24.56 (0.04)	24.78 (0.11)	1.13 (0.04)	0.06 (0.01)	0.05 (0.01)	0.85 (0.02)	1.36 (0.02)

The magnitudes are each time expressed in the filters U and B Johnson-Cousins in the reference frame of the supernova. Absorptions are expressed in magnitude in the filters of observation of the supernovæ V and R for 2000fr and I and Z for 2001gn and 2001hb. Enfin, the K-corrections make it possible to pass from the observant filters to the filters in the reference frame of the supernova.

The value of the color of 2001gn ($U-b=-0.4$ knop2003).

This supernova thus has either a very atypical color, or there is a problem in the evaluation magnitude to the maximum of the curves of light in Z or out of I the lightcurves of 2001gn are presented in the appendix B . We point out that only one measurement in Z was taken, it thus exists can be a problem with this single point. Moreover, we based our construction of the lightcurves by using the items zero of camera ACS which are not yet very well-known.

Lastly, the magnitude to the maximum of 2001gn out of I seems to be in agreement with the flux awaited of a supernova of the Ia type to a shift towards the red of 1.1 for standard cosmology. We will thus build our estimators of distance by using an analysis identical to that of perlmutter1999, i.e. , by considering only the corrections of factor of stretching and by selecting the nonextinct close supernovæ (with $U-b$ around -0.4 to the maximum), that is to say 12 supernovæ among the 15 previously selected.