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
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), and Contreras et al. (2010AJ....139..519C) samples in our analysis, which together account for ∼90% of our sample. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table5.dat 112 472 *Light-curve parameters of the combined SN sample
Notes on table5.dat: Combined SiFTO (Conley et al. 2008ApJ...681..482C) and SALT2 (Guy et al. 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.
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
Bytes Format Units Label Explanations
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)
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); 2 = Jha et al. (2006, Cat. J/AJ/131/527); 3 = Contreras et al. (2010AJ....139..519C); 4 = Hicken et al. (2009ApJ...700.1097H); 5 = Altavilla et al. (2004MNRAS.349.1344A); 6 = Krisciunas et al. (2000ApJ...539..658K); 7 = Hamuy et al. (1996, Cat. J/AJ/112/2408); 8 = Krisciunas et al. (2004AJ....128.3034K); 9 = Krisciunas et al. (2001AJ....122.1616K); 10 = Riess et al. (1999AJ....117..707R); 11 = Pastorello et al. (2007, Cat. J/MNRAS/377/1531); 12 = Krisciunas et al. (2004AJ....127.1664K); 13 = Leonard et al. (2005ApJ...632..450L); 14 = Krisciunas et al. (2006AJ....131.1639K); 15 = Strolger et al. (2002AJ....124.2905S); 16 = Kowalski et al. (2008, Cat. J/ApJ/686/749); 17 = Holtzman et al. (2008AJ....136.2306H); 18 = Guy et al. (2010, Cat. J/A+A/523/A7); 19 = Riess et al. (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.
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 01-Feb-2011
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