B. Hayden

Confirmation of a Star Formation Bias in Type Ia Supernova Distances and its Effect on the Measurement of the Hubble Constant

Previously we used the Nearby Supernova Factory sample to show that SNe~Ia having locally star-forming environments are dimmer than SNe~Ia having locally passive environments.Here we use the \constitution\ sample together with host galaxy data from \GALEX\ to independently confirm that result. The effect is seen using both the SALT2 and MLCS2k2 lightcurve fitting and standardization methods, with brightness differences of

UNITY: CONFRONTING SUPERNOVA COSMOLOGY’S STATISTICAL AND SYSTEMATIC UNCERTAINTIES IN A UNIFIED BAYESIAN FRAMEWORK

0.094 \pm 0.037\ \mathrm{mag}

The Discovery of a Gravitationally Lensed Supernova Ia at Redshift 2.22

for SALT2 and

The Extinction Properties of and Distance to the Highly Reddened Type IA Supernova 2012cu

0.155 \pm 0.041\ \mathrm{mag}

Correcting for peculiar velocities of Type Ia Supernovae in clusters of galaxies

for MLCS2k2 with

Understanding type Ia supernovae through their U-band spectra

R_V=2.5

SCALA: In situ calibration for integral field spectrographs

. When combined with our previous measurement the effect is

IMPROVING COSMOLOGICAL DISTANCE MEASUREMENTS USING TWIN TYPE IA SUPERNOVAE

0.094 \pm 0.025\ \mathrm{mag}

SN Ia Standardization on the Rise: Evidence for the Cosmological Importance of Pre-Maximum Measurements.

for SALT2. If the ratio of these local SN~Ia environments changes with redshift or sample selection, this can lead to a bias in cosmological measurements. We explore this issue further, using as an example the direct measurement of

The Massive and Distant Clusters of WISE Survey. I: Survey Overview and a Catalog of >2000 Galaxy Clusters at z~1.

H_0