The Distance to the Type Ia SN 1999by in NGC 2841

Details The Distance to the Type Ia SN 1999by in NGC 2841 The Distance to the Type Ia SN 1999by in NGC 2841

Jul 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8704g&link_type=abstract

HST Proposal ID #8704

Physics

Hst Proposal Id #8704 Cosmology

Scientific paper

HST is unique in its powerful ability to directly calibrate type Ia supernova luminosities by observing Cepheid variables in their host galaxies. Still, only five SNIa with light curves obtained photoelectrically have had their hosts distances measured and most of these are slow-declining, over- luminous events. We propose to estimate the distance to SN 1999by, a sub-luminous type Ia, by obtaining light curves of Cepheid variables we discover in NGC 2841. The Cepheid distance to SN 1999by combined with the previously measured SNIa will be used to calibrate all ~40 well-observed SN Ia events in the Hubble flow to estimate an unbiased Hubble constant. Because intrinsically faint SNIa are most often found in E/S0 galaxies, SN 1999by provides the only case where Cepheid calibration of a sub-luminous SNIa is possible.

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