| Abstract: |
Since the mid 1990s, type Ia supernovae have been used to measure the cosmological parameters. I will present the latest cosmological constraints obtained by this technique. These recent results are based on the measurement of several hundreds high redshift type Ia supernovae discovered by the SDSS and SNLS supernova surveys. Great care was taken to handle possible systematic uncertainties arising from various sources such as photometric calibration and the modeling of SN light-curves shape and color. I will describe the methods used to extract the relevant quantities and to derive today's most precise constraints on the Dark Energy equation of state parameter, w. New high redshift supernova programs are underway, such as within the Dark Energy Survey which started taking data a year ago, and using HyperSuperCam on Subaru which has the potentiel to discover and precisely measure even higher redshift supernovae. Further in time, the Large Synoptic Survey Telescope will be observing half the sky several times a week for 10 years, discovering supernovae by the thousands. I will briefly describe the prospects for these projects which will gather unprecedented number of high redshift supernovae. |
