Photometric properties of intermediate redshift Type Ia Supernovae observed by SDSS-II Supernova Survey

Abstract

We have analyzed multi-band light curves of 328 intermediate redshift (0.05 <= z < 0.24) type Ia supernovae (SNe Ia) observed by the Sloan Digital Sky Survey-II Supernova Survey (SDSS-II SN Survey). The multi-band light curves were parameterized by using the Multi-band Stretch Method, which can simply parameterize light curve shapes and peak brightness without dust extinction models. We found that most of the SNe Ia which appeared in red host galaxies (u - r > 2.5) don't have a broad light curve width and the SNe Ia which appeared in blue host galaxies (u - r < 2.0) have a variety of light curve widths. The Kolmogorov-Smirnov test shows that the colour distribution of SNe Ia appeared in red / blue host galaxies is different (significance level of 99.9%). We also investigate the extinction law of host galaxy dust. As a result, we find the value of Rv derived from SNe Ia with medium light curve width is consistent with the standard Galactic value. On the other hand, the value of Rv derived from SNe Ia that appeared in red host galaxies becomes significantly smaller. These results indicate that there may be two types of SNe Ia with different intrinsic colours, and they are obscured by host galaxy dust with two different properties.

21 pages, 15 figures, accepted for publication in MNRAS

References in corpus (16)

• The 2.5 m Telescope of the Sloan Digital Sky Survey
• Improved Dark Energy Constraints from ~100 New CfA Supernova Type Ia Light Curves
• Improved Distances to Type Ia Supernovae with Multicolor Light Curve Shapes: MLCS2k2
• Rates and properties of type Ia supernovae as a function of mass and star-formation in their host galaxies
• The Sloan Digital Sky Survey-II Supernova Survey: Technical Summary
• The Sloan Digital Sky Survey-II Supernova Survey: Search Algorithm and Follow-up Observations
• The colour-lightcurve shape relation of Type Ia supernovae and the reddening law
• On the Nature of Type Ia-CSM Supernovae: Optical and Near-Infrared Spectra of SN 2012ca and SN 2013dn
• SN 2005hj: Evidence for Two Classes of Normal-Bright SNe Ia and Implications for Cosmology
• First-Year Spectroscopy for the SDSS-II Supernova Survey
• Luminosity Indicators in the Ultraviolet Spectra of Type Ia Supernovae
• Type Ia Supernova Properties as a Function of the Distance to the Host Galaxy in the SDSS-II SN Survey
• Upper limit for circumstellar gas around the Type Ia SN 2000cx
• Constraints on Circumstellar Material Around the Type Ia Supernova 2007af
• Herschel limits on far-infrared emission from circumstellar dust around nearby Type Ia supernovae
• Spectral diversity of Type Ia Supernovae

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