Subluminous Type Ia Supernovae in the Supernova Legacy Survey

Details Subluminous Type Ia Supernovae in the Supernova Legacy Survey Subluminous Type Ia Supernovae in the Supernova Legacy Survey

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20915014g&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #150.14; Bulletin of the American Astronomical Society,

Astronomy and Astrophysics

Astronomy

Scientific paper

Subluminous Type Ia Supernovae (SNe Ia) are preferentially found in old stellar populations, implying progenitor ages of several Gyr, leading to questions as to whether they exist in significant quantities at high redshift. Due to their faintness, there is a bias against identifying these SNe spectroscopically, and it has not been possible to test this hypothesis in previous spectroscopically-confirmed surveys. Furthermore, these SNe have colors which deviate from those of normal SNe Ia, increasing the odds that they will be selected against. Here we extend the stretch method to fit subluminous SNe, and conduct a photometric search of more than 1000 SN candidates detected as part of the Supernova Legacy Survey (SNLS). We find a fraction of photometrically identified SNe Ia over 0.1

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