Subluminous Type Ia supernovae at high redshift from the Supernova Legacy Survey?

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DOIResolve DOI: http://doi.org/10.1088/0004-637X/727/2/107
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TypeArticle
Journal titleThe Astrophysical Journal
ISSN0004-637X
Volume727
Issue2
AbstractThe rate evolution of subluminous Type Ia supernovae (SNe Ia) is presented using data from the Supernova Legacy Survey. This sub-sample represents the faint and rapidly declining light curves of the observed SN Ia population here defined by low-stretch values (s ≤ 0.8). Up to redshift z = 0.6, we find 18 photometrically identified subluminous SNe Ia, of which six have spectroscopic redshift (and three are spectroscopically confirmed SNe Ia). The evolution of the subluminous volumetric rate is constant or slightly decreasing with redshift, in contrast to the increasing SN Ia rate found for the normal stretch population, although a rising behavior is not conclusively ruled out. The subluminous sample is mainly found in early-type galaxies with little or no star formation, so that the rate evolution is consistent with a galactic mass-dependent behavior: r(z) = A × Mg, with A = (1.1 ± 0.3) × 10-14 SNeyr-1M⊙ -1. © 2011. The American Astronomical Society. All rights reserved. Printed in the U.S.A.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); NRC Herzberg Institute of Astrophysics
Peer reviewedYes
NPARC number21272035
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Record identifier3760026d-2b35-4e39-9b6e-1cd7b788d280
Record created2014-05-22
Record modified2016-07-18
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