NOAO >   Observing Info >   Approved Programs >   2014A-0304

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Proposal Information for 2014A-0304


PI: Greg Aldering, Lawrence Berkeley National Lab, galdering@lbl.gov
Address: Physics Division, One Cyclotrin Rd., Berkeley, CA 94720, United States

CoI: Jakob Nordin, Lawrence Berkeley National Lab
CoI: Brian Hayden, Lawrence Berkeley National Lab

Title: Dwarf Galaxy Hosts of Type Ia Supernovae

Abstract: Type Ia supernovae (SNe Ia) are the best cosmological probes for mapping the expansion history of the universe. The cosmological utility of SNe Ia depends on the ability to compare brightnesses of high-redshift SNe Ia to those at low redshift, but recent studies have indicated possible environmental effects which may evolve in redshift and introduce biases to cosmological parameter estimates. The Nearby Supernova Factory has spectroscopically studied over 400 SNe Ia in the nearby smooth Hubble flow using a search technique that found SNe in all environments. This provides the most complete nearby Hubble-flow SN Ia sample to date, and has proven invaluable for investigating environmental effects on SN Ia brightnesses. We propose to use Gemini with GMOS to observe the pool of ultra-faint dwarf galaxies that remain unstudied, since these will provide the lowest abundance environments in which Type Ia supernovae properties have yet been explored.


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NOAO >   Observing Info >   Approved Programs >   2014A-0304

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