The effects of varying colour-luminosity relations on supernova science

Abstract

The success of Type Ia supernova (SN Ia) distance standardisation for cosmology relies on a single global linear relationship between their peak luminosity and colour, the $\beta$ parameter. However, there are several pieces of evidence and physical reasons to believe that this relation is not universal and may change within different subgroups, or even among individual objects. In this work, we allow $\beta$ to vary among subpopulations with different observed properties in the cosmological fits. Although the inferred cosmological parameters are consistent with previous studies that assume a single colour-luminosity relation, we find that the SN data favour nonuniversal distributions of $\beta$ when split according to SN colour and/or host-galaxy mass. For galaxy mass, we obtain a $\beta$-step relation in which low $\beta$ values occur in more massive galaxies, a trend that can be explained by differing dust reddening laws for two types of environments. For colour, we find that bluer/redder SNe Ia are consistent with a lower/larger $\beta$. This trend is explained with $\beta$ being a combination of a low intrinsic colour-luminosity relation dominant in bluer SNe and a higher extrinsic reddening relation dominant at redder colours. The host galaxy mass-step correction always provides better distance calibration, regardless of the multiple $\beta$ approaches, and we suggest that it may come from a difference in intrinsic colour-luminosity properties of SNe Ia in two types of environments. Additionally, we find that blue SNe in low-mass environments are better standard candles than the others.

arXiv comment11 pages, 7 figures, 2 tables. Accepted in MNRAS

References in corpus (63)

• Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
• Measurements of Omega and Lambda from 42 High-Redshift Supernovae
• The Complete Light-curve Sample of Spectroscopically Confirmed Type Ia Supernovae from Pan-STARRS1 and Cosmological Constraints from The Combined Pantheon Sample
• Improved cosmological constraints from a joint analysis of the SDSS-II and SNLS supernova samples
• Observational clues to the progenitors of Type-Ia supernovae
• Observational Constraints on the Nature of the Dark Energy: First Cosmological Results from the ESSENCE Supernova Survey
• Supernova Constraints and Systematic Uncertainties from the First 3 Years of the Supernova Legacy Survey
• SALT2: using distant supernovae to improve the use of Type Ia supernovae as distance indicators
• Conservative Constraints on Early Cosmology: an illustration of the Monte Python cosmological parameter inference code
• First-year Sloan Digital Sky Survey-II (SDSS-II) Supernova Results: Hubble Diagram and Cosmological Parameters
• The Supernova Legacy Survey 3-year sample: Type Ia Supernovae photometric distances and cosmological constraints
• Dust Attenuation Curves in the Local Universe: Demographics and New Laws for Star-forming Galaxies and High-redshift Analogs
• Rates and properties of type Ia supernovae as a function of mass and star-formation in their host galaxies
• Two populations of progenitors for type Ia SNe?
• SNLS3: Constraints on Dark Energy Combining the Supernova Legacy Survey Three Year Data with Other Probes
• The Dependence of Type Ia Supernova Luminosities on their Host Galaxies
• Hubble Residuals of Nearby Type Ia Supernovae Are Correlated with Host Galaxy Masses
• The Type Ia Supernova Rate
• The Effect of Host Galaxies on Type Ia Supernovae in the SDSS-II Supernova Survey
• The Diversity of Type Ia Supernovae from Broken Symmetries
• First Cosmology Results using Type Ia Supernovae from the Dark Energy Survey: Constraints on Cosmological Parameters
• Correcting Type Ia Supernova Distances for Selection Biases and Contamination in Photometrically Identified Samples
• An asymmetric explosion as the origin of spectral evolution diversity in type Ia supernovae
• The Carnegie Supernova Project: Intrinsic Colors of Type Ia Supernovae
• Evidence of Environmental Dependencies of Type Ia Supernovae from the Nearby Supernova Factory indicated by Local Hα
• Evidence for Two Distinct Populations of Type Ia Supernovae
• Type Ia Supernova Light Curve Inference: Hierarchical Models in the Optical and Near Infrared
• It's Dust: Solving the Mysteries of the Intrinsic Scatter and Host-Galaxy Dependence of Standardized Type Ia Supernova Brightnesses
• Measuring Ejecta Velocity Improves Type Ia Supernova Distances
• Is there Evidence for a Hubble bubble? The Nature of Type Ia Supernova Colors and Dust in External Galaxies
• Strong Dependence of Type Ia Supernova Standardization on the Local Specific Star Formation Rate
• Star Formation History up to z = 7.4: Implications for Gamma-Ray Bursts and the Cosmic Metallicity Evolution
• Extensive HST Ultraviolet Spectra and Multi-wavelength Observations of SN 2014J in M82 Indicate Reddening and Circumstellar Scattering by Typical Dust
• First Cosmology Results Using Type Ia Supernovae From the Dark Energy Survey: Analysis, Systematic Uncertainties, and Validation
• Interstellar Extinction Curve Variations Toward the Inner Milky Way: A Challenge to Observational Cosmology
• Improved Photometric Calibration of the SNLS and the SDSS Supernova Surveys
• Velocity Evolution and the Intrinsic Color of Type Ia Supernovae
• UNITY: Confronting Supernova Cosmology's Statistical and Systematic Uncertainties in a Unified Bayesian Framework
• The Foundation Supernova Survey: Measuring Cosmological Parameters with Supernovae from a Single Telescope
• Light and color curve properties of type Ia supernovae: Theory vs. Observations
• Improved constraints on cosmological parameters from SNIa data
• Early-type Host Galaxies of Type Ia Supernovae. II. Evidence for Luminosity Evolution in Supernova Cosmology
• First Cosmology Results using Type Ia Supernova from the Dark Energy Survey: Simulations to Correct Supernova Distance Biases
• Using Spectral Flux Ratios to Standardize SN Ia Luminosities
• Constraining dark matter halo properties using lensed SNLS supernovae
• Evolution in the Volumetric Type Ia Supernova Rate from the Supernova Legacy Survey
• The Effect of Environment on Type Ia Supernovae in the Dark Energy Survey Three-Year Cosmological Sample
• The Type Ia Supernova Color-Magnitude Relation and Host Galaxy Dust: A Simple Hierarchical Bayesian Model
• The Carnegie Supernova Project-I: Correlation Between Type Ia Supernovae and Their Host Galaxies from Optical to Near-Infrared Bands
• Environmental Dependence of Type Ia Supernova Luminosities from a Sample without a Local-Global Difference in Host Star Formation
• SUGAR: An improved empirical model of Type Ia Supernovae based on spectral features
• Standardizing Type Ia Supernova Absolute Magnitudes Using Gaussian Process Data Regression
• Type Ia Supernova Colors and Ejecta Velocities: Hierarchical Bayesian Regression with Non-Gaussian Distributions
• On the Lira law and the nature of extinction towards Type Ia Supernovae
• High-Velocity Type Ia Supernova Has a Unique Host Environment
• Steve: A hierarchical Bayesian model for Supernova Cosmology
• A Possible Distance Bias for Type Ia Supernovae with Different Ejecta Velocities
• Characterization of Type Ia Supernova Light Curves Using Principal Component Analysis of Sparse Functional Data
• Determining Type Ia Supernovae Host galaxy extinction probabilities and a statistical approach to estimating the absorption-to-reddening ratio $R_V$
• A metric space for type Ia supernova spectra
• Evidence for asymmetric distribution of circumstellar material around Type Ia Supernovae
• Supernova 2010ev: A reddened high velocity gradient type Ia supernova
• A study of the color diversity around maximum light in Type Ia supernovae

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• Using Rest-Frame Optical and NIR Data from the RAISIN Survey to Explore the Redshift Evolution of Dust Laws in SN Ia Host Galaxies
• Constraining R${}_V$ Variation Using Highly Reddened Type Ia Supernovae from the Pantheon+ Sample
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• Systematic errors on optical-SED stellar mass estimates for galaxies across cosmic time and their impact on cosmology
• A Spectroscopic Model of the Type Ia Supernova--Host Galaxy Mass Correlation from SALT3
• ZTF SN Ia DR2: Evidence of Changing Dust Distributions With Redshift Using Type Ia Supernovae
• BayeSN and SALT: A Comparison of Dust Inference Across SN Ia Light-curve Models with DES5YR
• Assessing differences between local galaxy dust attenuation and point source extinction within the same environments
• Stretch to stretch, dust to dust: lower-value local $H_0$ measurement from two-population modelling of type Ia supernovae
• $R_V$ from multi-waveband galaxy polarimetry in supernovae vicinity
• Narrow absorption lines from intervening material in supernovae. II. Galaxy properties
• ZTF SN~Ia DR2: Cosmology-independent constraints on Type Ia supernova standardisation from supernova siblings
• The Dark Energy Survey Supernova Program results: Type Ia Supernova brightness correlates with host galaxy dust