Physics
Scientific paper
Jul 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8611n&link_type=abstract
HST Proposal ID #8611
Physics
Hst Proposal Id #8611 Cosmology
Scientific paper
Two independent research groups have presented compelling evidence for an accelerating universe from the observation of high-redshift Type Ia supernovae {SNe Ia}. 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, improve upon our understanding of the underlying physics of the SN Ia explosion mechanism and attempt to constrain or determine their progenitors. Here we propose to obtain STIS/CCD UV spectra of five nearby {0.02 < z < 0.08} SNe Ia in the Hubble Flow. The spectra will be taken at weekly intervals over a range in time starting slightly before maximum light and extending to +30 days. These observations will accomplish the following three goals: {1} Calibration of the rest frame UV light curves of SNe Ia and an assessment of their potential use as distance indicators through UV light curve shape analyses. {2} Improvement in our understanding of the physics of SNe Ia, metallicity/evolutionary effects and correlations between peak brightness and UV spectral features. {3} Calibration of the SNe Ia previously observed by HST at high-redshift. For the z > 0.8 SNe Ia observed by both the Supernova Cosmology Project and the High-Z Supernovae Search Team this data is crucial for proper cross-filter k-corrections and calibration of the supernova photometry.
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