Restframe I-band Hubble diagram for type Ia supernovae up to redshift z $\sim$ 0.5
- Nobili, S.
- Amanullah, R.
- Garavini, G.
- Goobar, A.
- Lidman, C.
- Stanishev, V.
- Aldering, G.
- Antilogus, P.
- Astier, P.
- Burns, M. S.
- Conley, A.
- Deustua, S. E.
- Ellis, R.
- Fabbro, S.
- Fadeyev, V.
- Folatelli, G.
- Gibbons, R.
- Goldhaber, G.
- Groom, D. E.
- Hook, I.
- Howell, D. A.
- Kim, A. G.
- Knop, R. A.
- Nugent, P. E.
- Pain, R.
- Perlmutter, S.
- Quimby, R.
- Raux, J.
- Regnault, N.
- Ruiz-Lapuente, P.
- Sainton, G.
- Schahmaneche, K.
- Smith, E.
- Spadafora, A. L.
- Thomas, R. C.
- Wang, L.
DOIAbstract
Accepted for publication in A&A (01/04/2005) - Supernova Cosmology ProjectWe present a novel technique for fitting restframe I-band light curves on a data set of 42 Type Ia supernovae (SNe Ia). Using the result of the fit, we construct a Hubble diagram with 26 SNe from the subset at 0.01< z<0.1. Adding two SNe at z~0.5 yields results consistent with a flat $\Lambda$-dominated"concordance universe'' ($\Omega_M,\Omega_\Lambda$)=(0.25,0.75). For one of these, SN 2000fr, new near infrared data are presented. The high redshift supernova NIR data are also used to test for systematic effects in the use of SNe Ia as distance estimators. A flat, $\Lambda$=0, universe where the faintness of supernovae at z$\sim$ 0.5 is due to grey dust homogeneously ...
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