Statistical Connections Between the Properties of Type Ia Supernovae and the B--V Colors of Their Parent Galaxies, and the Value of H${}_0$

Abstract

Statistical connections between the properties of Type Ia supernovae (SNe Ia) and the B--V colors of their parent galaxies are established. Compared to SNe Ia in blue galaxies [B-V$\la$0.75], SNe Ia in redder galaxies have (1) a wider dispersion in the blueshifts of their Si II $\lambda$6355 absorption features, ten days after maximum light; (2) more rapidly declining light curves; and (3) lower luminosities. Even when the spectroscopically peculiar, very subluminous SNe Ia such as SN 1991bg are disregarded, SNe Ia in red galaxies are less luminous than those in blue galaxies by about 0.3 magnitudes. When SNe Ia that are thought to have been significantly extinguished by dust in their parent galaxies are disregarded, those in blue galaxies have observational absolute--magnitude dispersions of only ${\sigma }_{obs}(M_B)$=0.20 and ${\sigma }_{obs}(M_V)$=0.17, which implies that their intrinsic absolute--magnitude dispersions are very small. We use six SNe Ia whose absolute magnitudes have been calibrated by means of Cepheids, which also indicate that the intrinsic absolute--magnitude dispersions of SNe Ia in blue galaxies are very small, to calibrate SNe Ia in blue galaxies and obtain ${\mathrm{H}}_0=57\pm 4\mathrm{km}{\mathrm{s}}^{-1}\mathrm{Mp}{\mathrm{c}}^{-1}$. This value is in excellent agreement with that obtained by Saha et al. (1995b), in spite of the fact that they do not take into account any dependence of SN Ia absolute magnitude on the nature of the parent galaxy. Some implications of the statistical connections between SNe Ia and the colors of their parent galaxies, for identifying the progenitor binary systems of SNe Ia and for using high--redshift SNe Ia to measure q${}_0$, are briefly discussed.

LaTeX file, AASTeX4 style, 2 Tables and 4 Figures included separately. Postscript file available from http://www.nhn.uoknor.edu/~baron/

Cited by in corpus (39)

• Measurements of the Cosmological Parameters Omega and Lambda from the First 7 Supernovae at z >= 0.35
• New Constraints on ${\Omega }_M$, ${\Omega }_{\Lambda }$, and w from an Independent Set of Eleven High-Redshift Supernovae Observed with HST
• Type Ia Supernova Explosion Models
• Type Ia Supernovae: Influence of the Initial Composition on the Nucleosynthesis, Light Curves, Spectra and Consequences for the Determination of Omega_M & Lambda
• A Search for Environmental Effects on Type Ia Supernovae
• Infrared Spectra of the Subluminous Type Ia Supernova 1999by
• Type Ia Supernovae and the Hubble Constant
• The Progenitors of Subluminous Type Ia Supernovae
• Constraints on the Progenitors of SNeIa & Implications for the Cosmological Equation of State
• The effect of progenitor age and metallicity on luminosity and 56Ni yield in Type Ia supernovae
• Supernovae Rates: A Cosmic History
• Evolution of 3-9 Mo Stars for Z=0.001 - 0.03 and Metallicity Effects on Type Ia Supernovae
• Observational Properties of Thermonuclear Supernovae
• The Case for an Accelerating Universe from Supernovae
• SN 2003du: Signatures of the Circumstellar Environment in a Normal Type Ia Supernova?
• The Hubble Diagram of Type Ia Supernovae as a Function of Host Galaxy Morphology
• Positron Escape from Type Ia Supernovae
• Supernova type Ia luminosities, their dependence on second parameters, and the value of H_0
• Determination of the Hubble Constant Using a Two-Parameter Luminosity Correction for Type Ia Supernovae
• Dependence of Type Ia supernova luminosities on their local environment
• SNLS Spectroscopy: Testing for Evolution in Type Ia Supernovae
• Perturbation evolution in cosmologies with a decaying cosmological constant
• Secondary Parameters of Type Ia Supernova Light Curves
• A Novel Color Parameter As A Luminosity Calibrator for Type Ia Supernovae
• Type Ia Supernova: Burning and Detonation in the Distributed Regime
• The Distance to the Coma Cluster from Surface Brightness Fluctuations
• The Relation Between Ejecta Velocity, Intrinsic Color, and Host-Galaxy Mass for High-Redshift Type Ia Supernovae
• Type Ia Supernovae and Cosmology
• Type Ia Supernova Spectral Line Ratios as Luminosity Indicators
• Upper limit for circumstellar gas around the Type Ia SN 2000cx
• Dark energy, gravitation and supernovae
• Optical Light Curves of Supernovae
• Rebirth of Novae as Distance Indicators Due to Efficient Large Telescopes
• Environmental Dependence of Type Ia Supernovae in Low-Redshift Galaxy Clusters
• Redshift-distance relations from type Ia supernova observations. New constraints on grey dust models
• A Spectroscopic Model of the Type Ia Supernova--Host Galaxy Mass Correlation from SALT3
• A Study of Magnetized White Dwarf + Helium Star Binary Evolution to Type Ia Supernovae
• Cosmology with Supernovae
• Verifying the use of supernovae as probes of the cosmic expansion