It's Dust: Solving the Mysteries of the Intrinsic Scatter and Host-Galaxy Dependence of Standardized Type Ia Supernova Brightnesses

Abstract

The use of Type Ia Supernovae (SNe Ia) as cosmological tools has motivated significant effort to: understand what drives the intrinsic scatter of SN Ia distance modulus residuals after standardization, characterize the distribution of SN Ia colors, and explain why properties of the host galaxies of the SNe correlate with SN Ia distance modulus residuals. We use a compiled sample of $\sim 1450$ spectroscopically confirmed, photometric light-curves of SN Ia and propose a solution to these three problems simultaneously that also explains an empirical 11$\sigma$ detection of the dependence of Hubble residual scatter on SN Ia color. We introduce a physical model of color where intrinsic SN Ia colors with a relatively weak correlation with luminosity are combined with extrinsic dust-like colors ($E(B-V)$) with a wide range of extinction parameter values ($R_V$). This model captures the observed trends of Hubble residual scatter and indicates that the dominant component of SN Ia intrinsic scatter is from variation in $R_V$. We also find that the recovered $E(B-V)$ and $R_V$ distributions differ based on global host-galaxy stellar mass and this explains the observed correlation ($\gamma$) between mass and Hubble residuals seen in past analyses as well as an observed 4.5$\sigma$ dependence of $\gamma$ on SN Ia color. This finding removes any need to prescribe different intrinsic luminosities to different progenitor systems. Finally we measure biases in the equation-of-state of dark energy ($w$) up to $|\Delta w|=0.04$ by replacing previous models of SN color with our dust-based model; this bias is larger than any systematic uncertainty in previous SN Ia cosmological analyses.

17 pages, 13 figures

References in corpus (23)

• Wide-Field InfrarRed Survey Telescope-Astrophysics Focused Telescope Assets WFIRST-AFTA 2015 Report
• Improved Dark Energy Constraints from ~100 New CfA Supernova Type Ia Light Curves
• Improved Distances to Type Ia Supernovae with Multicolor Light Curve Shapes: MLCS2k2
• CfA3: 185 Type Ia Supernova Light Curves from the CfA
• Improved Distances to Type Ia Supernovae with Two Spectroscopic Subclasses
• Correcting Type Ia Supernova Distances for Selection Biases and Contamination in Photometrically Identified Samples
• Towards a Cosmological Hubble Diagram for Type II-P Supernovae
• Ages of Type Ia Supernovae Over Cosmic Time
• First Cosmology Results using Type Ia Supernovae from the Dark Energy Survey: The Effect of Host Galaxy Properties on Supernova Luminosity
• The colour-lightcurve shape relation of Type Ia supernovae and the reddening law
• Cosmological model insensitivity of local $H_0$ from the Cepheid distance ladder
• The Effect of Environment on Type Ia Supernovae in the Dark Energy Survey Three-Year Cosmological Sample
• Think Global, Act Local: The Influence of Environment Age and Host Mass on Type Ia Supernova Light Curves
• Supernova Host Galaxies in the Dark Energy Survey: I. Deep Coadds, Photometry, and Stellar Masses
• Type Ia Supernova Spectral Features in the Context of Their Host Galaxy Properties
• Type Ia Supernova Properties as a Function of the Distance to the Host Galaxy in the SDSS-II SN Survey
• The influence of Host Galaxies in Type Ia Supernova Cosmology
• ZTF Early Observations of Type Ia Supernovae III: Early-Time Colors as a Test for Explosion Models and Multiple Populations
• Physical Dust Models for the Extinction toward Supernova 2014J in M82
• A Possible Distance Bias for Type Ia Supernovae with Different Ejecta Velocities
• Estimating dust distances to Type Ia supernovae from colour excess time-evolution
• SNIa Host Galaxy Properties and the Dust Extinction Distribution
• Properties of interstellar dust responsible for extinction laws with unusually low total-to-selective extinction ratios of Rv=1-2

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