Light Echos and the Nature of Type Ia Supernovae

Details Light Echos and the Nature of Type Ia Supernovae Light Echos and the Nature of Type Ia Supernovae

Jul 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9148g&link_type=abstract

HST Proposal ID #9148

Physics

Hst Proposal Id #9148 Ism And Circumstellar Matter

Scientific paper

HST has resolved light echos around two Type Ia supernovae, SN 1991T and 1998bu and demonstrated that the distance between a supernova and dust clouds in the host galaxy disk can be determined with an accuracy of better than 20pc. We propose to take STIS snapshot images of a subset of 43 well observed Type Ia supernovae {SN Ia}, most of which have been discovered in late type galaxies over the last 40 years to make a systematic search for light echos around SN Ia. We will also observe a sample of 10 SN II and SN Ib/c, which are believed to be the result of massive star core collapse and, therefore, to be thin-disk population objects, in order to make an empirical calibration of the accuracy of our method for determining scale heights. The SN Ia sample will provide a direct as well as accurate estimate of the scale height of SN Ia which is an important clue to the progenitors of these events. The results will also test the possibility that a dusty environment favors the occurrence of SN Ia in late type galaxies as found for SN 1991T and 1998bu.

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