Cosmology with High-Redshift Type Ia Supernovae

Details Cosmology with High-Redshift Type Ia Supernovae Cosmology with High-Redshift Type Ia Supernovae

Feb 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002noao.prop..330p&link_type=abstract

NOAO Proposal ID #2002A-0330

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Scientific paper

The current Type Ia supernova Hubble diagram and CMB observations argue for a flat universe with some form of ``dark energy'' accelerating its expansion. Studies of distant supernovae can probe the expansion history of the universe through our current dark-energy-dominated era back to a matter-dominated era, making them one of the best current methods to study the amount and nature of such dark energy. With this program of SN studies we have an opportunity to obtain a Hubble diagram that will be of longlasting value as a record of the expansion history of the universe over the last 10 billion years. The CTIO 4-m telescope will reach back in time to find supernovae when the universe was still matter-dominated, extending our understanding of the expansion of the universe and possible evolution of supernovae over time. The Gemini GMOS will provide spectroscopic confirmation of a selection of these SNe and, together with the WIYN telescope, will allow us to obtain photometric follow-up - and hence a measurement of the brightness of these standard candles as a function of redshift. The Gemini NIRI will allow us to obtain crucial data for the very highest-redshift (z > 1) supernova whose rest-frame V-band will have been redshifted to our J- band. The CTIO search triggers all of the confirmation and follow-up work requested here as well as that which we have requested at other facilities.

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