NOAO >   Observing Info >   Approved Programs >   2012B-0278

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Proposal Information for 2012B-0278


PI: Alex Kim, Lawrence Berkeley National Laboratory, agkim@lbl.gov
Address: Physics Department, 1 Cyclotron Road, Berkeley, CA 94720, United States

CoI: Chris D'Andrea, University of Portsmouth
CoI: Mathew Smith, University of the Western Cape
CoI: Rollin Thomas, Lawrence Berkeley National Laboratory

Title: Spectroscopic Diversity in Supernovae Discovered by the Dark Energy Survey

Abstract: The Dark Energy Survey (DES) operating at the CTIO Victor Blanco Telescope will repeatedly image ten 3-square-degree fields with a ~ 4-day cadence. As the next-generation supernova experiment, DES aims to make 1%-level measurements of the expansion history of the Universe using thousands of Type Ia supernovae (SNe Ia) that it discovers and monitors. Supernovae and other transients will be discovered, but only with spectroscopy will their underlying natures be uncovered. Without the information provided by spectroscopy, the precision of the supernova Hubble diagram will be limited by uncertainties about the sample population. We propose the use of NOAO resources for 1) a pilot survey of magnitude-limited spectroscopic classification of an unbiased sample of all transients discovered by DES with AAT/AAOmega + 2dF to characterize the non-SN Ia background, and 2) detailed measurements of SN Ia spectral features with Gemini-GMOS to study diversity within the SN Ia family.


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NOAO >   Observing Info >   Approved Programs >   2012B-0278

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