NOAO >   Observing Info >   Approved Programs >   2003A-0339

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Proposal Information for 2003A-0339


PI: Peter Nugent, Lawrence Berkeley National Laboratory, penugent@LBL.gov
Address: M.S. 50F-1650, 1 Cyclotron Road, Berkeley, CA 94720-8139, USA

CoI: Greg Aldering, Lawrence Berkeley National Laboratory
CoI: D. A. Howell, Lawrence Berkeley National Laboratory
CoI: Mark Phillips, Carnegie Institution of Washington
CoI: Nick Suntzeff, NOAO
CoI: Saul Perlmutter, Lawrence Berkeley National Laboratory
CoI: Chris Smith, NOAO

Title: Metallicity Effects in the Spectra and Light Curves of Nearby Type Ia Supernovae

Abstract: Recently two independent research groups have presented compelling evidence for an accelerating universe from the observation of high- redshift Type Ia supernovae (SNe Ia) (see Figure 1). These findings have such important ramifications for cosmology that every effort must be made to throughly test the calibrated standard candles on which they are based. We propose to use the CTIO 1.5-m, KPNO 2.1-m and 4-m to spectroscopically screen ~ 20 supernovae candidates, and study ~ 8 which are SNe Ia in the Hubble flow. Five out of the 8 SNe Ia will be observed spectroscopically in the UV with a series of STIS/HST observations over three weeks as part of GO 9421 (P.I.: Nugent). In addition we request coordinated observations on Gemini-S with CIRPASS to obtain the largest spectral coverage to date for a SN Ia in the Hubble flow. These observations will allow us to accomplish the following goals: (1) Calibrate the rest frame UV light curves of SNe Ia. (2) Improve our understanding of the physics of SNe Ia, metallicity/evolutionary effects and correlations between peak brightness and UV spectral features. (3) Calibrate the high-z SNe Ia photometry previously obtained by both HST and NOAO's WIYN and CTIO 4-m telescopes.


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



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