J/ApJ/859/101 The supernovae Ia Pantheon sample (Scolnic+, 2018)
The complete light-curve sample of spectroscopically confirmed SNe Ia from
Pan-STARRS1 and cosmological constraints from the combined Pantheon sample.
Scolnic D.M., Jones D.O., Rest A., Pan Y.C., Chornock R., Foley R.J.,
Huber M.E., Kessler R., Narayan G., Riess A.G., Rodney S., Berger E.,
Brout D.J., Challis P.J., Drout M., Finkbeiner D., Lunnan R.,
Kirshner R.P., Sanders N.E., Schlafly E., Smartt S., Stubbs C.W., Tonry J.,
Wood-Vasey W.M., Foley M., Hand J., Johnson E., Burgett W.S., Chambers K.C.,
Draper P.W., Hodapp K.W., Kaiser N., Kudritzki R.P., Magnier E.A.,
Metcalfe N., Bresolin F., Gall E., Kotak R., McCrum M., Smith K.W.
<Astrophys. J., 859, 101 (2018)>
=2018ApJ...859..101S 2018ApJ...859..101S
ADC_Keywords: Supernovae; Redshifts; Spectra, optical; Photometry
Keywords: cosmology: observations ; dark energy ; supernovae: general
Abstract:
We present optical light curves, redshifts, and classifications for
365 spectroscopically confirmed Type Ia supernovae (SNe Ia) discovered
by the Pan-STARRS1 (PS1) Medium Deep Survey. We detail improvements to
the PS1 SN photometry, astrometry, and calibration that reduce the
systematic uncertainties in the PS1 SN Ia distances. We combine the
subset of 279 PS1 SNe Ia (0.03<z<0.68) with useful distance estimates
of SNe Ia from the Sloan Digital Sky Survey (SDSS), SNLS, and various
low-z and Hubble Space Telescope samples to form the largest combined
sample of SNe Ia, consisting of a total of 1048 SNe Ia in the range of
0.01<z<2.3, which we call the "Pantheon Sample". When combining Planck
2015 cosmic microwave background (CMB) measurements with the Pantheon
SN sample, we find Ωm=0.307±0.012 and w=-1.026±0.041 for
the wCDM model. When the SN and CMB constraints are combined with
constraints from BAO and local H0 measurements, the analysis yields
the most precise measurement of dark energy to date:
w0=-1.007±0.089 and wa=-0.222±0.407 for the w0waCDM model.
Tension with a cosmological constant previously seen in an analysis of
PS1 and low-z SNe has diminished after an increase of 2x in the
statistics of the PS1 sample, improved calibration and photometry, and
stricter light-curve quality cuts. We find that the systematic
uncertainties in our measurements of dark energy are almost as large
as the statistical uncertainties, primarily due to limitations of
modeling the low-redshift sample. This must be addressed for future
progress in using SNe Ia to measure dark energy.
Description:
This analysis relies heavily on the work by Rest+ (2014, J/ApJ/795/44)
and Scolnic+ (2014ApJ...795...45S 2014ApJ...795...45S), hereafter R14 and S14,
respectively. R14 and S14 analyzed the first 1.5yr of PS1 SN Ia data
and combined it with a compilation of low-z surveys.
The SNe Ia presented in this paper include all SNe discovered during
the PS1 survey (2009 September-2014 January) that have been
spectroscopically confirmed as SNe Ia.
The PS1 data presented here are from the PS1 Medium Deep (MD) Survey,
which observes SNe in grizp1 with an average cadence of 7 days per
filter.
The spectroscopic selection over the full survey is similar to that
outlined in R14. Spectroscopic observations of PS1 targets were
obtained with a variety of instruments: the Blue Channel Spectrograph
and Hectospec on the 6.5m MMT, the Gemini Multi-Object Spectrographs
(GMOS) on both Gemini North and South, the Low Dispersion Survey
Spectrograph-3 (LDSS323) and the Magellan Echellette (MagE) on the
6.5m Magellan Clay telescope, the Inamori-Magellan Areal Camera and
Spectrograph (IMACS) on the 6.5m Magellan Baade telescope, the ISIS
spectrograph on the WHT, and DEIMOS on the 10m Keck telescope.
A table of the spectroscopically confirmed SNe Ia that includes the
dates of the observations and the telescopes used is given in
Appendix A (see Table 15 and spec.dat file).
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
fullz.dat 44 1048 The Pantheon sample with updated heliocentric
redshifts (from lcparamfulllong_zhel.txt)
spec.dat 59 188 Spectroscopic information for all spectroscopically
classified Pan-STARRS1 SNIa from 2011 June to
2014 September (from spec-summary.txt)
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See also:
B/sn : Asiago Supernova Catalogue (Barbon et al., 1999-)
V/147 : The SDSS Photometric Catalogue, Release 12 (Alam+, 2015)
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/AJ/131/1648 : Type Ia supernovae at high and low redshifts (Blondin+, 2006)
J/ApJ/659/122 : Improved distances to type Ia supernovae (Jha+, 2007)
J/ApJ/666/674 : ESSENCE supernova survey (Miknaitis+, 2007)
J/AJ/136/2306 : SDSS-II Supernova survey, 2005 (Holtzman+, 2008)
J/ApJ/700/331 : Light curves of type Ia supernovae (CfA3) (Hicken+, 2009)
J/ApJ/700/1097 : Light curve parameters of SN Ia (Hicken+, 2009)
J/ApJS/185/32 : First-year SDSS-II SN results (Kessler+, 2009)
J/AJ/139/519 : Carnegie supernova project. SNe Ia (Contreras+, 2010)
J/AJ/139/120 : Low-redshift Type-Ia supernovae (Folatelli+, 2010)
J/A+A/523/A7 : Light curves of type Ia supernovae in SNLS (Guy+, 2010)
J/ApJ/722/566 : Host galaxies of SNIa in SDSS-II SN survey (Lampeitl+, 2010)
J/MNRAS/406/782 : Type Ia supernovae luminosities (Sullivan+, 2010)
J/A+A/529/L4 : Reddening law of type Ia supernovae (Chotard+, 2011)
J/ApJS/192/1 : Light-curve parameters from the SNLS (Conley+, 2011)
J/MNRAS/412/1419 : Nearby supernova rates (Leaman+, 2011)
J/ApJ/731/120 : Intrinsic SN Ia light curves (Mandel+, 2011)
J/AJ/142/156 : The CSP (DR2): photometry of SNe Ia (Stritzinger+, 2011)
J/AJ/143/126 : Spectroscopy of 462 nearby SNe Ia (Blondin+, 2012)
J/ApJS/200/12 : CfA4: light curves for 94 type Ia SNe (Hicken+, 2012)
J/ApJ/746/85 : THe HST Cluster Supernova Survey. V. (Suzuki+, 2012)
J/ApJ/750/99 : The Pan-STARRS1 photometric system (Tonry+, 2012)
J/ApJ/763/88 : SDSS-II supernovae Ia cosmological analysis (Campbell+, 2013)
J/ApJ/773/53 : Type Ia SNe spectroscopy by the CSP (Folatelli+, 2013)
J/A+A/552/A124 : SNLS & SDSS SN surveys photometric calib. (Betoule+, 2013)
J/MNRAS/433/2240 : SALT2 parameters & distances for SNe (Ganeshalingam+, 2013)
J/A+A/568/A22 : Joint analysis of the SDSS-II & SNLS SNIa (Betoule+, 2014)
J/MNRAS/438/1391 : Host galaxies of Type Ia SN from PTF (Pan+, 2014)
J/ApJ/795/44 : PS1 SNe Ia (0.02<z<0.7) griz light curves (Rest+, 2014)
J/AJ/148/13 : Redshifts of 65 CANDELS supernovae (Rodney+, 2014)
J/ApJS/224/3 : ESSENCE 6yr spectroscopic follow-up (Narayan+, 2016)
J/ApJ/826/56 : HST/WFC3 obs. of Cepheids in SN Ia host gal. (Riess+, 2016)
J/ApJ/852/81 : 17 PS1 superluminous SNe LCs + spectra (Lunnan+, 2018)
J/ApJ/857/51 : Measuring dark energy data with PS1 SNe. II. (Jones+, 2018)
J/ApJ/902/14 : Revised redshifts of the Pantheon SNe Ia (Steinhardt+, 2020)
Byte-by-byte Description of file: fullz.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Name Target ID (1)
12- 18 F7.5 --- zcmb [0.01/2.3] CMB redshift
20- 27 F8.6 --- zhel [0.008/2.3] Heliocentric redshift
29- 36 F8.5 --- Bmag [13.9/26.9] B-band magnitude
38- 44 F7.5 --- e_Bmag [0.08/0.5] Bmag uncertainty
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Note (1): The SNe IA of the Pantheon sample come from the following surveys:
SDSS (Frieman+ 2008AJ....135..338F 2008AJ....135..338F and Kessler+ 2009, J/ApJS/185/32 --
<SDSS-II SN NNNNN> in Simbad), PS1 (Jones+, 2018, J/ApJ/857/51),
SNLS (Conley+ 2011, J/ApJS/192/1 and Sullivan+ 2011ApJ...737..102S 2011ApJ...737..102S),
CfA1-4 (Riess+ 1999AJ....117..707R 1999AJ....117..707R ; Jha+ 2006, J/AJ/131/527 ;
Hicken+ 2009, J/ApJ/700/331 and 2009, J/ApJ/700/1097 and
2012, J/ApJS/200/12), CSP (Contreras+ 2010, J/AJ/139/519 and
Folatelli+ 2010, J/AJ/139/120 and Stritzinger+ 2011, J/AJ/142/156),
GOODS (Riess+ 2007ApJ...659...98R 2007ApJ...659...98R ; <[RSC2007] HSTYYAaa> in Simbad),
CANDELS/CLASH (Graur+ 2014ApJ...783...28G 2014ApJ...783...28G and Rodney+ 2014, J/AJ/148/13
and Riess+ 2018ApJ...853..126R 2018ApJ...853..126R), SCP (Suzuki+ 2012, J/ApJ/746/85).
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Byte-by-byte Description of file: spec.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 A4 --- --- [PS1-]
5- 14 A10 --- Name PS1 identifier
16- 25 A10 "Y-M-D" Date1 Observation date
26 A1 --- --- [,]
27- 36 A10 "Y-M-D" Date2 Second date of observation if any
38- 39 A2 --- Type [Ia] SN type: always "Ia"
40 A1 --- u_Type [?] Uncertainty flag on Type
42- 47 F6.4 --- zhel Heliocentric redshift
48 A1 --- u_zhel [?] Uncertainty flag on zhel
50- 52 A3 --- n_Name Flag on PS1 ("yes" or "no", not explained
in the paper)
54- 59 A6 --- Tel Telescope (MMT (149 occurrences),
Gemini (38 occurrences) or sdss (1 occurrence))
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Acknowledgements:
Charles Louis Steinhardt [steinhardt at nbi.ku.dk] for the coordinates
of the supernovae (see Steinhardt et al. 2020, J/ApJ/902/14).
History:
spec.dat downloaded from:
http://archive.stsci.edu/hlsps/ps1cosmo/scolnic/spec_summary/
fullz.dat downloaded from GitHub:
http://github.com/dscolnic/Pantheon/blob/master/lcparam_full_long_zhel.txt
(End) Emmanuelle Perret [CDS] 04-Jun-2019