Mathematics – Logic
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9201h&link_type=abstract
HST Proposal ID #9201
Mathematics
Logic
Hst Proposal Id #9201 Cosmology
Scientific paper
The Hubble diagram of Type Ia supernovae appears to show a significant acceleration of the cosmic expansion, interpreted as evidence for a new form of dark energy such as a cosmological constant. However, in order to establish this result securely we need to show that distance estimates are insensitive to evolving properties of the progenitor population such as age and metallicity. The best way to test these possibilities is by demographic studies of supernovae and their progenitor populations. We propose to study the environments of more than 26 high-redshift supernovae for which extensive HST WFPC2 data were taken to assemble the Hubble diagram. We will create deep multicolor images and catalog the properties of the host, companion and foreground galaxies. We will correlate supernova properties, such as peak brightness and distance residual, with other quantities known to correlate with progenitor population age and metallicity, such as the color of the host galaxy and the distance between the host centroid and the supernova. The results will either reveal or significantly constrain noncosmological systematics attached to the use of supernovae as distance indicators at redshifts between 0.3 and 1.
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