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We present data from the Supernova Cosmology Project for five high redshiftType Ia supernovae (SNe Ia) that were obtained using the NICMOS infrared cameraon the Hubble Space Telescope. We add two SNe from this sample to a rest-frameI-band Hubble diagram, doubling the number of high redshift supernovae on thisdiagram. This I-band Hubble diagram is consistent with a flat universe(Omega_Matter, Omega_Lambda= 0.29, 0.71). A homogeneous distribution of largegrain dust in the intergalactic medium (replenishing dust) is incompatible withthe data and is excluded at the 5 sigma confidence level, if the SN host galaxyreddening is corrected assuming R_V=1.75. We use both optical and infraredobservations to compare photometric properties of distant SNe Ia with those ofnearby objects. We find generally good agreement with the expected colorevolution for all SNe except the highest redshift SN in our sample (SN 1997ekat z=0.863) which shows a peculiar color behavior. We also present spectraobtained from ground based telescopes for type identification and determinationof redshift.

Constraining dust and color variations of high-z SNe using NICMOS on Hubble Space Telescope