J/ApJS/192/1 Light-curve parameters from the SNLS (Conley+, 2011)
Supernova constraints and systematic uncertainties from the first three years
of the Supernova Legacy Survey.
Conley A., Guy J., Sullivan M., Regnault N., Astier P., Balland C.,
Basa S., Carlberg R.G., Fouchez D., Hardin D., Hook I.M., Howell D.A.,
Pain R., Palanque-Delabrouille N., Perrett K.M., Pritchet C.J., Rich J.,
Ruhlmann-Kleider V., Balam D., Baumont S., Ellis R.S., Fabbro S.,
Fakhouri H.K., Fourmanoit N., Gonzalez-Gaitan S., Graham M.L., Hudson M.J.,
Hsiao E., Kronborg T., Lidman C., Mourao A.M., Neill J.D., Perlmutter S.,
Ripoche P., Suzuki N., Walker E.S.
<Astrophys. J. Suppl. Ser., 192, 1 (2011)>
=2011ApJS..192....1C 2011ApJS..192....1C
ADC_Keywords: Supernovae ; Redshifts ; Photometry
Keywords: cosmological parameters - cosmology: observations -
supernovae: general
Abstract:
We combine high-redshift Type Ia supernovae from the first three years
of the Supernova Legacy Survey (SNLS) with other supernova (SN)
samples, primarily at lower redshifts, to form a high-quality joint
sample of 472 SNe (123 low-z, 93 SDSS, 242 SNLS, and 14 Hubble Space
Telescope). SN data alone require cosmic acceleration at >99.999%
confidence, including systematic effects. For the dark energy equation
of state parameter (assumed constant out to at least z=1.4) in a
flat universe, we find w=-0.91+0.16-0.20(stat)+0.07-0.14(sys)
from SNe only, consistent with a cosmological constant. Our fits
include a correction for the recently discovered relationship between
host-galaxy mass and SN absolute brightness. We pay particular
attention to systematic uncertainties, characterizing them using a
systematic covariance matrix that incorporates the redshift dependence
of these effects, as well as the shape-luminosity and color-luminosity
relationships. Unlike previous work, we include the effects of
systematic terms on the empirical light-curve models. The total
systematic uncertainty is dominated by calibration terms. We describe
how the systematic uncertainties can be reduced with soon to be
available improved nearby and intermediate-redshift samples,
particularly those calibrated onto USNO/SDSS-like systems.
Description:
SNLS combines photometry from the deep component of the CFHT-LS
(Canada-France-Hawaii Telescope Legacy survey) with extensive
spectroscopic follow-up from the Keck, Very Large Telescope (VLT),
and Gemini telescopes to determine SN types and measure redshifts.
The photometry is carried out with MegaCam, a 1deg2 imager at the
prime focus of CFHT. We use the natural systems of the SNLS, HST,
SDSS, Hicken et al. (2009ApJ...700..331H 2009ApJ...700..331H), and Contreras et al.
(2010AJ....139..519C 2010AJ....139..519C) samples in our analysis, which together account
for ∼90% of our sample.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table5.dat 112 472 *Light-curve parameters of the combined SN sample
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Notes on table5.dat: Combined SiFTO (Conley et al. 2008ApJ...681..482C 2008ApJ...681..482C) and
SALT2 (Guy et al. 2007A&A...466...11G 2007A&A...466...11G) light-curve parameters for full
data sample. Note that the individual variables are correlated, as are
the values for different SNe due to systematic and light-curve fitter
training uncertainties.
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See also:
B/sn : Asiago Supernova Catalogue (Barbon et al., 1999-)
J/AJ/112/2408 : Light Curves of 29 SNe (Hamuy+ 1996)
J/ApJ/607/665 : Type Ia supernovae at z>1 discovered by HST (Riess+, 2004)
J/AJ/131/527 : UBVRI light curves of 44 type Ia supernovae (Jha+, 2006)
J/A+A/477/717 : Spectroscopy of Type Ia supernovae (Bronder+, 2008)
J/ApJ/673/981 : Type Ia supernova rates with HST ACS (Kuznetsova+, 2008)
J/MNRAS/389/1871 : Type Ia supernovae candidates from SDSS (Horesh+, 2008)
J/AJ/135/1766 : Sloan Digital Sky Survey-II supernova survey (Zheng+, 2008)
J/A+A/506/999 : Photometric Calibration of SNLS (Regnault+, 2009)
J/A+A/523/A7 : Light curves of type Ia supernovae in SNLS (Guy+, 2010)
J/ApJS/190/418 : Light curves for 165 SNe (Ganeshalingam+, 2010)
Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name SN name
11- 15 F5.3 --- z CMB frame redshift
17- 21 F5.3 --- e_z Uncertainty in z (1)
23- 28 F6.3 mag Bmag Apparent B band magnitude (2)
30- 34 F5.3 mag e_Bmag Uncertainty in Bmag
36- 40 F5.3 --- s The light-curve width stretch parameter (4)
42- 46 F5.3 --- e_s Uncertainty in Stretch
48- 53 F6.3 mag col SN color measure (see Filt)
55- 59 F5.3 mag e_col Uncertainty in Color
61- 65 F5.2 [Msun] logM Log of host galaxy stellar mass
67- 74 F8.2 d MJD Modified Julian date of rest-frame B-band maximum
76- 79 F4.2 d e_MJD Uncertainty in MJD
81-104 A24 --- Filt Filter(s) used (BVR, griz, F110W, F606W for
examples)
106-112 A7 --- Ref Reference(s) (3)
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Note (1): Error does not include residual peculiar velocity uncertainty.
Note (2): Includes the lensing term and the effects of the statistical
uncertainty in logM.
Note (3): References as follows:
1 = Krisciunas et al. (2007AJ....133...58K 2007AJ....133...58K);
2 = Jha et al. (2006, Cat. J/AJ/131/527);
3 = Contreras et al. (2010AJ....139..519C 2010AJ....139..519C);
4 = Hicken et al. (2009ApJ...700.1097H 2009ApJ...700.1097H);
5 = Altavilla et al. (2004MNRAS.349.1344A 2004MNRAS.349.1344A);
6 = Krisciunas et al. (2000ApJ...539..658K 2000ApJ...539..658K);
7 = Hamuy et al. (1996, Cat. J/AJ/112/2408);
8 = Krisciunas et al. (2004AJ....128.3034K 2004AJ....128.3034K);
9 = Krisciunas et al. (2001AJ....122.1616K 2001AJ....122.1616K);
10 = Riess et al. (1999AJ....117..707R 1999AJ....117..707R);
11 = Pastorello et al. (2007, Cat. J/MNRAS/377/1531);
12 = Krisciunas et al. (2004AJ....127.1664K 2004AJ....127.1664K);
13 = Leonard et al. (2005ApJ...632..450L 2005ApJ...632..450L);
14 = Krisciunas et al. (2006AJ....131.1639K 2006AJ....131.1639K);
15 = Strolger et al. (2002AJ....124.2905S 2002AJ....124.2905S);
16 = Kowalski et al. (2008, Cat. J/ApJ/686/749);
17 = Holtzman et al. (2008AJ....136.2306H 2008AJ....136.2306H);
18 = Guy et al. (2010, Cat. J/A+A/523/A7);
19 = Riess et al. (2007ApJ...659...98R 2007ApJ...659...98R);
Note (4): the stretch parameter is related to the timescale over which a
SN Ia evolves: the timescale is multiplied by a factor s. SNe with
higher s evolve more slowly, with broader light curves.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 01-Feb-2011