Supernova light-curve fitters and dark energy

We show that when a procedure is made to remove the tension between a supernova la (SN la) data set and observations from BAO and CMB, there might be the case where the same SN la set built with two different light-curve fitters behaves as two separate and distinct supernova sets, and the tension found by some authors between supernova sets actually could be due to tension or inconsistency between fitters. We also show that the information of the fitter used in an SN la data set could be relevant to determine whether phantom type models are favored or not when such a set is combined with the BAO/CMB joint parameter. (C) 2010 Elsevier B.V. All rights reserved.