Cosmology with High-Redshift Type Ia Supernovae

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

Aug 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002noao.prop..322k&link_type=abstract

NOAO Proposal ID #2002B-0322

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Scientific paper

Type Ia supernovae (SNe Ia) have provided direct evidence for an accelerating universe and for the existence of a ``dark energy'' driving that expansion. During the next few years SNe Ia observations will begin to address the properties of this dark energy. We propose to use GMOS and NIRI on Gemini to observe supernovae at two redshift ranges: 0.4< z< 0.7 and z~1.0. These measurements will determine the equation of state of the dark energy, and will also allow us to set more stringent systematic limits on the current supernova data. With GMOS, we will obtain spectra of 30 supernovae at z< 0.7 discovered as part of the Tololo Rolling Supernova Search (TRSS), and of another two SNe at z~1. These spectra will confirm the identity of candidates as SNe Ia and will measure redshifts. In addition, following our success with a SN Ia at z=1.06 during semester 2001A, we will obtain J-band photometry with NIRI of two SNe at z~1. These will be used in tandem with HST and/or Subaru z-band measurements to provide rest-frame B-V colours, which are necessary for measuring any extinction by dust.

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