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Photometric Type Ia Supernova Candidates from the Three-year SDSS-II SN Survey Data
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2011 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 738, 162- p.Article in journal (Refereed) Published
Abstract [en]

We analyze the three-year Sloan Digital Sky Survey II (SDSS-II) Supernova (SN) Survey data and identify a sample of 1070 photometric Type Ia supernova (SN Ia) candidates based on their multiband light curve data. This sample consists of SN candidates with no spectroscopic confirmation, with a subset of 210 candidates having spectroscopic redshifts of their host galaxies measured while the remaining 860 candidates are purely photometric in their identification. We describe a method for estimating the efficiency and purity of photometric SN Ia classification when spectroscopic confirmation of only a limited sample is available, and demonstrate that SN Ia candidates from SDSS-II can be identified photometrically with ~91% efficiency and with a contamination of ~6%. Although this is the largest uniform sample of SN candidates to date for studying photometric identification, we find that a larger spectroscopic sample of contaminating sources is required to obtain a better characterization of the background events. A Hubble diagram using SN candidates with no spectroscopic confirmation, but with host galaxy spectroscopic redshifts, yields a distance modulus dispersion that is only ~20%-40% larger than that of the spectroscopically confirmed SN Ia sample alone with no significant bias. A Hubble diagram with purely photometric classification and redshift-distance measurements, however, exhibits biases that require further investigation for precision cosmology.

Place, publisher, year, edition, pages
2011. Vol. 738, 162- p.
Keyword [en]
cosmology: observations, supernovae: general, surveys
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:su:diva-70082DOI: 10.1088/0004-637X/738/2/162OAI: diva2:479114
Available from: 2012-01-17 Created: 2012-01-17 Last updated: 2012-02-14Bibliographically approved

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Sollerman, Jesper
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Department of Astronomy
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