NOAO >   Observing Info >   Approved Programs >   2005A-0502

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Proposal Information for 2005A-0502


PI: Greg Aldering, Lawrence Berkeley National Laboratory, GAldering@lbl.gov
Address: Physics Department, 1 Cyclotron Rd/ MS 50R-5032, Berkeley, CA 94720, USA

CoI: Peter Nugent, LBNL
CoI: Saul Perlmutter, LBNL
CoI: Lifan Wang, LBNL
CoI: Rollin Thomas, LBNL
CoI: Brian Lee, LBNL
CoI: Richard Scalzo, LBNL

Title: IR Observations of Hubble Flow Type Ia Supernovae

Abstract: We propose to use NOAO facilities to obtain NIR spectroscopy and photometry of Type Ia supernovae in the smooth Hubble-flow -- where relative redshifts accurately translate into relative luminosities -- as the first step in building a statistically significant sample of multi- epoch NIR spectra and NIR lightcurves. These measurements are central to advancing our understanding of Type Ia supernova as standardized distance indicators. Gemini-South with GNIRS will be used to obtain near-IR spectroscopy at several epochs, while CTIO 4-m with ISPI and KPNO 4-m with FLAMINGOS will obtain near-IR photometry of these same Type Ia supernovae. (Both components are essential, as the photometry will be used to flux-calibrate the spectroscopy while the spectroscopy will be used to K-correct the photometry.) This work is part of a major international campaign combining multi-epoch UV HST observations of these supernovae with ground-based optical and near-IR follow-up programs including photometry, spectroscopy and spectropolarimetry. These observations will enable both empirical studies and state-of-the art modeling of the physics and progenitors of SNe Ia. Our studies will form the basis for the next phase of precision cosmology measurements using SNe Ia, and will allow us to fully capitalize on the substantial past and on-going investments in Type Ia supernova cosmology by NOAO.


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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