NOAO >   Observing Info >   Approved Programs >   2010B-0291

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Proposal Information for 2010B-0291


PI: Louis-Gregory Strolger, Western Kentucky University, louis.strolger@wku.edu
Address: Physics Department, 1906 College Heights Blvd. #11077, Bowling Green, KY 42101, USA

CoI: Schuyler Van Dyk, IPAC/Caltech
CoI: Schuyler Wolff, Western Kentucky University
CoI: Lachlan Campbell, Western Kentucky University
CoI: April Pease, Western Kentucky University
CoI: Suzanna Sadler, Western Kentucky University

Title: Tests of Environmental Effects on SN Ia Production

Abstract: The largely unknown type Ia supernova mechanism remains one of the largest sources of possible systematic uncertainty in achieving precise measures of dark energy. The host galaxy environments of SNe Ia provide our best opportunity for constraining the mechanism(s) of the SN Ia progenitor system, i.e., the stars involved, the incubation times, and the sensitivity of SNe Ia to changes in the local gas-phase metallicity. The latter can affect the luminosity of the resultant Ia event, and possibly the success in ultimately yielding a SN Ia event. We seek to solidify possible environmental trends in SN Ia rates from \it direct measures of host galaxy properties, using the sample collected by the Nearby Galaxies Supernova Search project. This study will uncover which has the greatest influence on SN Ia production efficiency: parent population age, rate of star-formation, or metallicity. Here, we propose to continue our analysis using the Mayall 4m + RCSP to obtain broad SEDs, R_23 metallicities, and star formation rates for 22 of the 30 remaining host galaxies (all z\le0.15) from the NGSS sample (10 targets were obtained in the 2010A semester). These data will be combined with the remaining sample to be sought in the future semesters. The sample will provide a validity test of the mostly \it indirect trends being established for SNe Ia from the LOSS, SDSS, SNfactory and other surveys, and ultimately steer future investigations towards more precise SN Ia cosmology.


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