Mathematics – Logic
Scientific paper
Jul 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8641s&link_type=abstract
HST Proposal ID #8641
Mathematics
Logic
Hst Proposal Id #8641 Cosmology
Scientific paper
Type Ia supernovae provide evidence for an accelerating universe: an extraordinary result that needs to be rigorously tested. The two chief alternatives to a cosmological source for the observed shape of the high-z Hubble diagram {z >= 0.4} are dust that absorbs, but does not redden much, and intrinsic changes in the luminosity of distant supernovae due to the age of the stellar population or the chemical composition of the progenitor stars. We propose to test the generic predictions of composition models and the specific predictions of dust models through very wide wavelength coverage UBVRI observations of 7 supernovae near z = 0.5. These observations, with precise restframe UBVR from HST and restframe I from large groundbased telescopes, will provide enough information for a definitive test of the ``grey'' dust proposal, while they also place the most stringent constraints on differences that could be attributed to chemical differences or age differences between nearby and distant samples of SN Ia. The unique restframe U-band observations proposed here will be especially important in comparing SN Ia at z=0, where we have a sample, and z=0.5, where we don't, and in interpreting the data from very high redshift supernovae with z>=1. Our goal is cosmology, our measuring tool is supernovae, and we need precise, wide wavelength measurements at z=0.5 to test the quality of this yardstick.
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