J/ApJ/902/14 Revised redshifts of the Pantheon supernovae Ia (Steinhardt+, 2020)
Effects of supernova redshift uncertainties on the determination of cosmological
parameters.
Steinhardt C.L., Sneppen A., Sen B.
<Astrophys. J., 902, 14 (2020)>
=2020ApJ...902...14S 2020ApJ...902...14S
ADC_Keywords: Supernovae; Redshifts; Surveys
Keywords: Cosmological parameters ; Cosmology ; Type Ia supernovae ;
Astronomy data analysis ; Standard candles
Abstract:
Redshifts used in current cosmological supernova samples are measured
using two primary techniques, one based on well-measured host galaxy
spectral lines and the other based on supernova-dominated spectra.
Here, we construct an updated Pantheon catalog with revised redshifts,
redshift sources, and estimated uncertainties for the entire sample to
investigate whether these two techniques yield consistent results. The
best-fit cosmological parameters using these two measurement
techniques disagree, with a supernova-only sample producing Ωm
3.2σ higher and H0 2.5σ lower than a hostz-only sample,
and we explore several possible sources of bias that could result from
using the lower-precision supernova-dominated redshifts. In a pilot
study, we show that using a host redshift-only subsample will
generically produce lower Ωm and matter density Ωmh2
and slightly higher H0 than previous analysis which, for the
Pantheon data set, could result in supernova and cosmic microwave
background measurements agreeing on Ωmh2 despite tension in
H0. To obtain rigorous results, though, the Pantheon catalog should
be improved by obtaining host spectra for supernovae that have faded,
and future surveys should be designed to use host galaxy redshifts
rather than lower-precision methods.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 155 1048 Updated Pantheon (Scolnic+ 2018, J/ApJ/859/101)
catalog
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See also:
B/sn : Asiago Supernova Catalogue (Barbon et al., 1999-)
II/349 : The Pan-STARRS release 1 (PS1) Survey - DR1 (Chambers+, 2016)
II/333 : Sloan Digital Sky Survey-II Supernova Survey (Sako+, 2018)
J/AJ/131/527 : UBVRI light curves of 44 type Ia supernovae (Jha+, 2006)
J/ApJ/700/331 : Light curves of type Ia supernovae (CfA3) (Hicken+, 2009)
J/AJ/139/519 : Carnegie supernova project. SNe Ia (Contreras+, 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/ApJ/742/89 : Relations between spectra & colors of SNe Ia (Foley+, 2011)
J/ApJS/200/12 : CfA4: light curves for 94 type Ia SNe (Hicken+, 2012)
J/ApJ/755/61 : SN Ia host galaxies SFR from SDSS-II (Smith+, 2012)
J/ApJ/773/53 : Type Ia SNe spectroscopy by the CSP (Folatelli+, 2013)
J/A+A/568/A22 : Joint analysis of the SDSS-II & SNLS SNe Ia (Betoule+, 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/MNRAS/451/1973 : Type Ia supernovae igh-velocity features (Silverman+, 2015)
J/ApJ/857/51 : Measuring dark energy data with PS1 SNe. II. (Jones+, 2018)
J/ApJ/859/101 : The supernovae Ia Pantheon sample (Scolnic+, 2018)
J/ApJ/876/85 : HST observations for LMC Cepheids (Riess+, 2019)
J/ApJ/882/120 : CfA, CSP, BSP and LOSS spec. & phot. of SNe Ia (Wang+, 2019)
http://classic.sdss.org/supernova/snlist_confirmed.html : SDSS-II SNe
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Name Supernova identifier
12- 22 F11.8 mag mu [33.25/46.22] Distance modulus
24- 36 F13.11 mag e_mu [0.09/0.4] Uncertainty in mu
38- 51 F14.12 --- zHel [0.0089/2.26] Heliocentric redshift
53- 65 F13.11 --- zCMB [0.01/2.262] Cosmic Microwave Background
frame redshift
67- 83 F17.15 --- e_zCMB [0.0000049/0.04]?=0 Uncertainty in zCMB
85- 98 F14.10 deg RAdeg Right Ascension in decimal degrees (J2000) (1)
100-115 F16.12 deg DEdeg Declination in decimal degrees (J2000) (1)
117-123 A7 --- Survey Survey identifier (2)
125-151 A27 --- Type Redshift type (H=Host (702 occurrences);
S = Supernova)
153-155 A3 --- Known Known-error sample? (yes=450 occurrences)
-- See Section 2.1.
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Note (1): The coordinates of the supernovae are those listed in the Pantheon
bulk flow correactions.
Vespasian (<[GRM2014] CLF11Ves> in Simbad) coordinates have been
corrected (from Graur+ 2014ApJ...783...28G 2014ApJ...783...28G) in agreement with the author,
by CDS.
Coordinates for Frodo ( in Simbad) have been added from
Strolger+ 2004ApJ...613..200S 2004ApJ...613..200S
Note (2): Survey as follows:
SDSS = SDSS-II SN survey from Smith+ 2012, J/ApJ/755/61 and
Sako+ (2018, II/333), and SDSS SkyServer DR16 (380 occurrences)
-- See Section A.3.
PS1 = Pan-STARRS supernovae (see Jones+, 2018, J/ApJ/857/51 ;
279 occurrences)
SNLS = the Supernova Legacy Survey 3-year sample (Guy+ 2010 J/A+A/523/A7 ;
236 occurrences) -- See Section A.2.
CSP = Supernovae from the Carnegie Supernova Project
(Contreras+ 2010, J/AJ/139/519 ; 25 occurrences)
-- See Section A.4.
CfA4 = SNe from the F. L. Whipple Observatory of the Harvard-Smithsonian
Center for Astrophysics (CfA; 41 occurrences) -- See Section A.5.
CfA3 = SNe from the F. L. Whipple Observatory of the Harvard-Smithsonian
Center for Astrophysics (CfA; 34 occurrences) -- See Section A.5.
CfA2 = SNe from the F. L. Whipple Observatory of the Harvard-Smithsonian
Center for Astrophysics (CfA; 18 occurrences) -- See Section A.5.
CfA1 = SNe from the F. L. Whipple Observatory of the Harvard-Smithsonian
Center for Astrophysics (CfA; 9 occurrences) -- See Section A.5.
GOODS = Hubble program (15 occurrences) -- See Section A.7.
CANDELS = Hubble program; Rodney+ 2014, J/AJ/148/13 (6 occurrences)
-- See Section A.7.
SCP = Hubble program (the Supernova Cosmology Project; 3 occurrences)
-- See Section A.7.
CLASH = Hubble program; Graur+ 2014ApJ...783...28G 2014ApJ...783...28G (2 occurrences)
-- See Section A.7.
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Acknowledgements:
Charles Louis Steinhardt [steinhardt at nbi.ku.dk]
History:
From electronic version of the journal
19-Sep-2022: misprint on declination sign corrected for Eagle and Ombo
in Table 2.
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 18-Jan-2022