J/MNRAS/465/1274 SDSS-II SN Ia BVRI photometry (Takanashi+, 2017)
Photometric properties of intermediate-redshift Type Ia supernovae observed by
the Sloan Digital Sky Survey-II Supernova Survey.
Takanashi N., Doi M., Yasuda N., Kuncarayakti H., Konishi K.,
Schneider D.P., Cinabro D., Marriner J.
<Mon. Not. R. Astron. Soc., 465, 1274-1288 (2017)>
=2017MNRAS.465.1274T 2017MNRAS.465.1274T (SIMBAD/NED BibCode)
ADC_Keywords: Supernovae ; Galaxies, nearby ; Photometry, UBVRI ; Redshifts
Keywords: supernovae: general - dust, extinction - galaxies: ISM
Abstract:
We have analysed multiband 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. The multiband light curves
were parametrized by using the multiband stretch method, which can
simply parametrize light-curve shapes and peak brightness without dust
extinction models. We found that most of the SNe Ia that appeared in
red host galaxies (u-r>2.5) do not have a broad light-curve
width and the SNe Ia that 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 appearing in red/blue
host galaxies is different (a significance level of 99.9 per cent). We
also investigate the extinction law of host galaxy dust. As a result,
we find that the value of Rv derived from SNe Ia with medium
light-curve widths is consistent with the standard Galactic value,
whereas the value of Rv derived from SNe Ia that appear in red host
galaxies becomes significantly smaller. These results indicate that
there may be two types of SNe Ia with different intrinsic colours, and
that they are obscured by host galaxy dust with two different
properties.
Description:
In this study, we use u-, g-, r-, i- and z-band (Fukugita et al.,
1996AJ....111.1748F 1996AJ....111.1748F; Doi et al., 2010AJ....139.1628D 2010AJ....139.1628D) light curves of
328 SNe Ia in the range 0.05≤z<0.241 obtained by the 2005-2007
SDSS-II SN Survey. The sample of SNe Ia (hereafter the SDSS sample)
consists of three groups: (1) spectroscopically confirmed SNe Ia; (2)
spectroscopically probable SNe Ia; (3) photometrically probable SNe Ia
with host galaxy spectroscopic redshifts.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table5.dat 81 328 Fitting parameters of the 328 intermediate
redshift supernovae Ia
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- SNID SDSS-SNID (SDSS-II SN NNNN)
7- 14 A8 --- Name SN name (SNYYYYaa)
16- 18 I3 --- Type SN type (1)
20- 23 F4.2 --- z Redshift (2)
25- 28 F4.2 --- s(B) B-band stretch factor
30- 33 F4.2 --- e_s(B) Uncertainty of B-band stretch factor
35- 40 F6.2 mag BMAG Absolute B-band peak magnitude (Vega)
42- 45 F4.2 mag e_BMAG Uncertainty of B-band peak magnitude
47- 52 F6.2 mag VMAG Absolute V-band peak magnitude (Vega)
54- 57 F4.2 mag e_VMAG Uncertainty of V-band peak magnitude
59- 64 F6.2 mag RMAG Absolute R-band peak magnitude (Vega)
66- 69 F4.2 mag e_RMAG Uncertainty of R-band peak magnitude
71- 76 F6.2 mag IMAG ? Absolute I-band peak magnitude (Vega)
78- 81 F4.2 mag e_IMAG ? Uncertainty of I-band peak magnitude
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Note (1): Type abbreviations as follows:
120 = spectroscopically confirmed SN Ia
119 = spectroscopically probable SN Ia
118 = SN Ia identified by external groups of SDSS
105 = photometrically probable SN Ia
Note (2): Redshifts from Sako et al. (2011, Cat. J/ApJ/738/162).
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 03-Sep-2018