NOAO >   Observing Info >   Approved Programs >   2010B-0614

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Proposal Information for 2010B-0614


PI: Patrick Kelly, Stanford University, pkelly3@stanford.edu
Address: Physics Department, 382 Via Pueblo Mall, Stanford, CA 94305, USA

CoI: David Burke, SLAC National Accelerator Laboratory

Title: Shifting Standards: SN Ia Calibration Across Host Environments

Abstract: We propose continuing our program of imaging ~160 low-redshift Constitution SN host galaxies in \textitu'g'r'i'z' filters. Stellar masses estimated from existing SDSS imaging of 70 host galaxies reveal a systematic trend in Hubble residuals where SN Ia are ~10% brighter (after light curve correction) when they occur in more massive galaxies. Our ongoing effort will place strong constraints on a host mass- dependent trend in Hubble residuals. We additionally propose related observations of 40 low-inclination spiral host galaxies in H(alpha) to measure the separation of SN Ia explosions from nearby spiral arms. Simple models of spiral density wave propagation and resulting star formation enable the ages of `prompt' progenitors to be estimated. By identifying younger and older `prompt' SN Ia progenitors in high metallicity environments, these measurements will disentangle the effects of metallicity and age on SN Ia calibration.


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 >   2010B-0614

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