The Nature of Dark Energy from Type Ia Supernovae

Details The Nature of Dark Energy from Type Ia Supernovae The Nature of Dark Energy from Type Ia Supernovae

Feb 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006noao.prop..267h&link_type=abstract

NOAO Proposal ID #2006A-0267

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Type Ia supernovae (SNe Ia) currently provide the most direct evidence for an accelerating Universe and for the existence of an unknown "dark energy" driving this expansion. The 5-year Supernova Legacy Survey (SNLS) will deliver a definitive dataset with well-sampled g'r'i'z' light curves, allowing precise measurement of the cosmological parameters (Omega_Matter, Omega_Lambda). Based on our successful first year results (Astier et al., submitted) we expect the final sample to determine the cosmological equation of state parameter "w" to a statistical precision of +/-0.05, testing theories for the origin of the universal acceleration. The amount of spectroscopic follow-up performed will define the success of this survey. Approximately 700 of the 1000 SNe Ia detected will be spectroscopically confirmed in a coherent program involving all of the world's major telescopes (Gemini, VLT, Keck). Gemini, with nod-and-shuffle observations, plays a pivotal role within this collaboration (Howell et al. 2005). The goal for Gemini this semester is to obtain types and redshifts for 30 SN Ia candidates between redshift 0.6-0.9, contributing to a large, high quality and homogeneous SN Ia sample with photometry, spectroscopy, light-curve sampling, and colour information superior to any existing - or planned - sample. This is a continuing QR (quick response) proposal for GMOS-N.

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