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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