NOAO >   Observing Info >   Approved Programs >   2003B-0310

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Proposal Information for 2003B-0310


PI: Saul Perlmutter, Lawrence Berkeley National Laboratory, saul@lbl.gov
Address: MS 50-232, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA

CoI: Reynald Pain, CNRS/IN2P3 LPNHE, Universites Paris VI and VII
CoI: Chris Pritchet, University of Victoria
CoI: Ray Carlberg, University of Toronto
CoI: Isobel Hook, University of Oxford
CoI: James Rich, CEA Saclay
CoI: Richard McMahon, University of Cambridge
CoI: Robert Knop, Vanderbilt University
CoI: Greg Aldering, Lawrence Berkeley National Laboratory
CoI: Eric Smith, Vanderbilt University
CoI: D. Andy Howell, Lawrence Berkeley National Laboratory
CoI: Lifan Wang, Lawrence Berkeley National Laboratory
CoI: Vitaliy Fadayev, Lawrence Berkeley National Laboratory
CoI: Rachel Gibbons, Lawrence Berkeley National Laboratory
CoI: Robert Vogel, UC Berkeley (Physics)
CoI: Anthony Spadafora, Lawrence Berkeley National Laboratory

Title: The Nature of Dark Energy from Type Ia Supernovae

Abstract: Type Ia supernovae (SNeIa) provide direct evidence for an accelerating universe, and for the existence of "dark energy'' driving that expansion. The CFHT Legacy Survey (CFHTLS ) has now begun to deliver detections ,and well-sampled g'r'i'z' light curves, for Type Ia supernovae out to redshifts of order unity (~1000 SNeIa expected over 5 years). Using these data, we will obtain a precise measurement of the cosmological parameters (Omega_mass, Omega_Lambda); our goal is to determine the cosmological equation of state parameter w to a precision of better than +-0.10, and hence test theories for the origin of the universal acceleration. The goal for Gemini this semester is to obtain types and redshifts for ~60 SNeIa out to z~=0.9. This will provide a high quality SNeIa sample comparable in size to existing SNeIa samples, but with superior photometry, light-curve sampling, and colour information. Gemini observations represent a vital component of our overall spectroscopic followup strategy, which also involves the ESO VLT, Keck, and Magellan telescopes.


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NOAO >   Observing Info >   Approved Programs >   2003B-0310

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