NOAO >   Observing Info >   Approved Programs >   2013B-0317

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Proposal Information for 2013B-0317


PI: R. Chris Smith, NOAO, csmith@ctio.noao.edu
Address: CTIO, Colina El Pino S/N, La Serena, Chile

CoI: Alex Kim, Lawrence Berkeley National Laboratory
CoI: Rollin Thomas, Lawrence Berkeley National Laboratory
CoI: Chris D'Andrea, University of Portsmouth
CoI: Mark Sullivan, University of Southampton

Title: Controlling Cosmology Systematics with Spectroscopy of DES Supernovae & their Host Galaxies

Abstract: As the next-generation experiment to understand and constrain the characteristics of dark energy, the Dark Energy Survey (DES) aims to make a 1%-level measurement of the expansion history of the Universe using the Type Ia supernovae (SNe Ia) that it discovers. The DES SN survey will provide the largest and most homogeneous sample of high- redshift SNe Ia, with the best controlled systematics, prior to LSST, producing well-measured griz light curves of ~3500 SNe Ia over 5 years. But DES is only a photometric survey; spectroscopic observations are required for both obtaining redshifts of the observed SNe and constraining systematics of the sample population. We propose the use of NOAO resources to 1) obtain redshifts of the host galaxies of ~300 SNe with AAT/AAOmega+2dF to aid in the photometric- classification of observed transients and allow first-year DES SNe to be placed on the Hubble diagram, and 2) make detailed measurements of SN Ia spectral features with Gemini/GMOS that will allow for checks of two limiting SN systematics, dust and population evolution, while providing redshifts for SNe in faint hosts that are otherwise unobtainable.


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



NOAO >   Observing Info >   Approved Programs >   2013B-0317

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