[O II] as an Effective Indicator of the Dependence Between the Standardised Luminosities of Type Ia Supernovae and the Properties of their Host Galaxies

Abstract

We have obtained IFU spectra of 75 SN Ia host galaxies from the Foundation Supernova survey to search for correlations between the properties of individual galaxies and SN Hubble residuals. After standard corrections for light-curve width and SN colour have been applied, we find correlations between Hubble residuals and the equivalent width of the [O II] $\lambda \lambda$ 3727, 3729 doublet (2.3$\sigma$), an indicator of the specific star formation rate (sSFR). When splitting our sample by SN colour, we find no colour dependence impacting the correlation between EW[O II] and Hubble residual. However, when splitting by colour, we reveal a correlation between the Hubble residuals of blue SNe Ia and the Balmer decrement (2.2$\sigma$), an indicator of dust attenuation. These correlations remain after applying a mass-step correction, suggesting that the mass-step correction does not fully account for the limitations of the colour correction used to standardise SNe Ia. Rather than a mass correction, we apply a correction to SNe from star forming galaxies based on their measurable EW[O II]. We find that this correction also removes the host galaxy mass step, while also greatly reducing the significance of the correlation with the Balmer decrement for blue SNe Ia. We find that correcting for EW[O II], in addition to or in place of the mass-step, may further reduce the scatter in the Hubble diagram.

16 pages, 15 figures

References in corpus (18)

• 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
• The Pantheon+ Analysis: Cosmological Constraints
• Some Aspects of Measurement Error in Linear Regression of Astronomical Data
• Measurements of the Hubble Constant: Tensions in Perspective
• UV-extended E-MILES stellar population models: young components in massive early-type galaxies
• CfA3: 185 Type Ia Supernova Light Curves from the CfA
• It's Dust: Solving the Mysteries of the Intrinsic Scatter and Host-Galaxy Dependence of Standardized Type Ia Supernova Brightnesses
• The Pantheon+ Analysis: SuperCal-Fragilistic Cross Calibration, Retrained SALT2 Light Curve Model, and Calibration Systematic Uncertainty
• SALT3: An Improved Type Ia Supernova Model for Measuring Cosmic Distances
• A new measurement of the Hubble constant using Type Ia supernovae calibrated with surface brightness fluctuations
• First Cosmology Results using Type Ia Supernovae from the Dark Energy Survey: The Effect of Host Galaxy Properties on Supernova Luminosity
• 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
• Accuracy of environmental tracers and consequence for determining the Type Ia Supernovae magnitude step
• The Dark Energy Survey: Cosmology Results With ~1500 New High-redshift Type Ia Supernovae Using The Full 5-year Dataset
• Using Host Galaxy Spectroscopy to Explore Systematics in the Standardisation of Type Ia Supernovae
• Aperture-corrected spectroscopic type Ia supernova host galaxy properties
• Cosmological Inference from Host-Selected Type Ia Supernova Samples

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