Confirming the first Double Degenerate Sn Ia Progenitor

Details Confirming the first Double Degenerate Sn Ia Progenitor Confirming the first Double Degenerate Sn Ia Progenitor

Jul 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009hst..prop12207b&link_type=abstract

HST Proposal ID #12207. Cycle 18

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Scientific paper

We propose to determine whether the nearby {50-100 pc} binary WD system SDSS 1257+5452, recently discovered by the SWARMS survey, is the first example of a Type Ia supernova progenitor. Our careful radial velocity measurements disocvered that this white dwarf has a companion. The companion's nature could not be definitely established from the ground-based optical observations alone, but observations by two independent groups determine a high mass {> 1.3 solar masses} for the system, near or exceeding the Chandrasaekhar mass. Near-UV photometry taken with the UVOT camera on SWIFT detected an additional spectral component bluewards of the WD strongly arguing that the companion is another white dwarf. We request use of HST to acquire a spectrum of this binary system, from the far UV to optical wavelengths in order to measure the mass and temperature of both objects in the binary system. If the combined mass of the system is greater than the Chandrasekhar mass, this system would be the first known example of the long-sought for double degenerate progenitors of Type Ia SNe.;

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