The Pantheon+ Analysis: SuperCal-Fragilistic Cross Calibration, Retrained SALT2 Light Curve Model, and Calibration Systematic Uncertainty

Abstract

We present here a re-calibration of the photometric systems used in the Pantheon+ sample of Type Ia supernovae (SNe Ia) including those used for the SH0ES distance-ladder measurement of H${}_0$. We utilize the large and uniform sky coverage of the public Pan-STARRS stellar photometry catalog to cross-calibrate against tertiary standards released by individual SN Ia surveys. The most significant updates over the `SuperCal' cross-calibration used for the previous Pantheon and SH0ES analyses are: 1) expansion of the number of photometric systems (now 25) and filters (now 105), 2) solving for all filter offsets in all systems simultaneously in order to produce a calibration uncertainty covariance matrix that can be used in cosmological-model constraints, and 3) accounting for the change in the fundamental flux calibration of the HST CALSPEC standards from previous versions on the order of $1.5\%$ over a $\Delta \lambda$ of 4000~Å. The re-calibration of samples used for light-curve fitting has historically been decoupled from the retraining of the light-curve model. Here, we are able to retrain the SALT2 model using this new calibration and find the change in the model coupled with the change to the calibration of the light-curves themselves causes a net distance modulus change ($d\mu /dz$) of 0.04 mag over the redshift range $0<z<1$. We introduce a new formalism to determine the systematic impact on cosmological inference by propagating the covariance in fitted calibration offsets through retraining simultaneously with light-curve fitting and find a total calibration uncertainty impact of ${\sigma }_w=0.013$, which is roughly half the size of the sample statistical uncertainty. Similarly, we find a systematic SN calibration contribution to the SH0ES H${}_0$ uncertainty is less than 0.2~km/s/Mpc, suggesting that SN Ia calibration cannot resolve the current level of the `Hubble Tension'.

arXiv commentPublished in ApJ. Comments welcome. Papers and data release here PantheonPlusSH0ES.github.io

References in corpus (51)

• SciPy 1.0--Fundamental Algorithms for Scientific Computing in Python
• The Astropy Project: Building an inclusive, open-science project and status of the v2.0 core package
• Measuring Reddening with SDSS Stellar Spectra and Recalibrating SFD
• The Complete Light-curve Sample of Spectroscopically Confirmed Type Ia Supernovae from Pan-STARRS1 and Cosmological Constraints from The Combined Pantheon Sample
• A Comprehensive Measurement of the Local Value of the Hubble Constant with 1 km/s/Mpc Uncertainty from the Hubble Space Telescope and the SH0ES Team
• Improved cosmological constraints from a joint analysis of the SDSS-II and SNLS supernova samples
• New Hubble Space Telescope Discoveries of Type Ia Supernovae at z > 1: Narrowing Constraints on the Early Behavior of Dark Energy
• The u'g'r'i'z' Standard Star Network
• The Pantheon+ Analysis: Cosmological Constraints
• The Pan-STARRS1 Photometric System
• The Pantheon+ Analysis: The Full Dataset and Light-Curve Release
• Improved Dark Energy Constraints from ~100 New CfA Supernova Type Ia Light Curves
• Supernova Constraints and Systematic Uncertainties from the First 3 Years of the Supernova Legacy Survey
• A Redetermination of the Hubble Constant with the Hubble Space Telescope from a Differential Distance Ladder
• BVRI Light Curves for 22 Type Ia Supernovae
• The Supernova Legacy Survey 3-year sample: Type Ia Supernovae photometric distances and cosmological constraints
• CfA3: 185 Type Ia Supernova Light Curves from the CfA
• Photometric Calibration of the First 1.5 Years of the Pan-STARRS1 Survey
• UBVRI Light Curves of 44 Type Ia Supernovae
• Photometric Response Functions of the SDSS Imager
• Cosmological Constraints from Measurements of Type Ia Supernovae discovered during the first 1.5 years of the Pan-STARRS1 Survey
• emcee v3: A Python ensemble sampling toolkit for affine-invariant MCMC
• The Carnegie Supernova Project: Second Photometry Data Release of Low-Redshift Type Ia Supernovae
• SOUSA: the Swift Optical/Ultraviolet Supernova Archive
• The Optical-Infrared Extinction Curve and its Variation in the Milky Way
• CfA4: Light Curves for 94 Type Ia Supernovae
• The Carnegie Supernova Project I: Third Photometry Data Release of Low-Redshift Type Ia Supernovae and Other White Dwarf Explosions
• Cepheid Calibrations from the Hubble Space Telescope of the Luminosity of Two Recent Type Ia Supernovae and a Re-determination of the Hubble Constant
• It's Dust: Solving the Mysteries of the Intrinsic Scatter and Host-Galaxy Dependence of Standardized Type Ia Supernova Brightnesses
• The Foundation Supernova Survey: Motivation, Design, Implementation, and First Data Release
• Measuring Dark Energy Properties with Photometrically Classified Pan-STARRS Supernovae. II. Cosmological Parameters
• SALT3: An Improved Type Ia Supernova Model for Measuring Cosmic Distances
• Supercal: Cross-Calibration of Multiple Photometric Systems to Improve Cosmological Measurements with Type Ia Supernovae
• First Cosmology Results Using Type Ia Supernovae From the Dark Energy Survey: Analysis, Systematic Uncertainties, and Validation
• Improved Photometric Calibration of the SNLS and the SDSS Supernova Surveys
• Measuring Type Ia Supernova Populations of Stretch and Color and Predicting Distance Biases
• The Pantheon+ Analysis: Evaluating Peculiar Velocity Corrections in Cosmological Analyses with Nearby Type Ia Supernovae
• Forward Global Photometric Calibration of the Dark Energy Survey
• New Grids of Pure-Hydrogen White-Dwarf NLTE Model Atmospheres \newline and the HST/STIS Flux Calibration
• Stellar population models in the UV: I. Characterisation of the New Generation Stellar Library
• The Distance to NGC 1316 (Fornax A) From Observations of Four Type Ia Supernovae
• The Foundation Supernova Survey: Measuring Cosmological Parameters with Supernovae from a Single Telescope
• Cosmological model insensitivity of local $H_0$ from the Cepheid distance ladder
• Color Dispersion and Milky Way Reddening Among Type Ia Supernovae
• Lick Observatory Supernova Search Follow-Up Program: Photometry Data Release of 93 Type Ia Supernovae
• Improved Treatment of Host-Galaxy Correlations in Cosmological Analyses With Type Ia Supernovae
• Near-Ultraviolet Properties of a Large Sample of Type Ia Supernovae as Observed with the Swift UVOT
• A Revised SALT2 Surface for Fitting Type Ia Supernova Light Curves
• The CALSPEC Stars P177D and P330E
• Binning is Sinning (Supernova Version): The Impact of Self-Calibration in Cosmological Analyses with Type Ia Supernovae
• A Calibration of NICMOS Camera 2 for Low Count-Rates

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• Joint Curvature and Growth Rate measurements with Supernova Peculiar Velocities and the CMB
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