Calibration of Nearby Type Ia Supernovae as Standard Candles: The Next Step

Details Calibration of Nearby Type Ia Supernovae as Standard Candles: The Next Step Calibration of Nearby Type Ia Supernovae as Standard Candles: The Next Step

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8100s&link_type=abstract

HST Proposal ID #8100

Computer Science

Hst Proposal Id #8100 Clusters Of Galaxies And Lensing

Scientific paper

We propose to continue our calibration experiment for M{ max} of type Ia supernovae {SNe Ia} by determining Cepheid distances to their parent galaxies. To date we have completed {citeic4182a - citengc4639} the calibration for 6 SNe Ia, from Cycles 1, and 3 - 5. Our results from Cycle 6 on a seventh SN Ia, SN 1989B in NGC 3627, are ready to be submitted citengc3627. Cepheid-calibrated luminosities of two additional SNe Ia have become available from external data. HST observations of NGC 4527 {SN 1991T} and a few test exposures of NGC 1316 {SNe, 1980N and 1981D} are planned for Cycle 7. Although there are now a total of 9 SNe Ia with Cepheid-calibrated absolute magnitudes M{ max} in B and V, resulting values of H_0 in the literature range from 55 citeschaefer98 to 69 citeMKF98. The discrepancy depends on the exclusion of some of the calibrators for various reasons, the inclusion of questionable objects, and/or differences in second-parameter corrections. The only way out of this dilemma is to obtain a statistically robust sample of SNe Ia with reliable Cepheid distances. -- We request 2 * 34 orbits during Cycle 8 for the discovery and two-passband photometry of the Cepheids in the two target galaxies NGC 3982 {SN 1998aq} and NGC 1316 {SNe, 1980N and 1981D}, based on 2 orbits each for 12 epochs in F555W and 2 orbits each for 5 epochs in F814W.

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