Constraining the Hubble Constant with a Type II Supernova

Details Constraining the Hubble Constant with a Type II Supernova Constraining the Hubble Constant with a Type II Supernova

Aug 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007noao.prop...55m&link_type=abstract

NOAO Proposal ID #2007B-0055

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We plan to determine the Hubble constant (H_0) to ≲10% by directly inferring distances to a sample of Type II-P supernovae in the Hubble flow (cz ~ 9000 km/s), independent of any of the lower rungs on the distance ladder. Measurements of cosmological parameters are currently limited by the precision of H_0. Starting with one object, we propose to obtain multi-epoch photospheric- phase high signal-to-noise ratio optical spectroscopic observations with GMOS. We will perform a detailed quantitative spectroscopic non-LTE model atmosphere analysis, and infer the supernova distance with a ≲10% accuracy. The modeling of such rare high-quality data will be used to place constraints on pre-supernova massive star evolution and the explosion mechanism. Ultimately, to improve the statistical uncertainty in the inferred H_0 value, we plan to collect distances for three more supernovae over as many semesters, along with a comparable number obtained at the VLT.

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