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Multiple Images of a Highly Magnified Supernova Formed by an Early-Type Cluster Galaxy Lens
Patrick L. Kelly, Steven A. Rodney, Tommaso Treu +28
In 1964, Refsdal hypothesized that a supernova whose light traversed multiple paths around a strong gravitational lens could be used to measure the rate of cosmic expansion. We rep…
On the Nature of Type Ia-CSM Supernovae: Optical and Near-Infrared Spectra of SN 2012ca and SN 2013dn
Ori D. Fox, Jeffrey M. Silverman, Alexei V. Filippenko +17
A growing subset of Type Ia supernovae (SNe Ia) show evidence for unexpected interaction with a dense circumstellar medium (SNe Ia-CSM). The precise nature of the progenitor, howev…
Twins for life? A comparative analysis of the Type Ia supernovae 2011fe and 2011by
Melissa L. Graham, Ryan J. Foley, Weikang Zheng +6
The nearby Type Ia supernovae (SNe Ia) 2011fe and 2011by had nearly identical photospheric phase optical spectra, light-curve widths, and photometric colours, but at peak brightnes…
Constraints on the Alignment of Galaxies in Galaxy Clusters from 14,000 Spectroscopic Members
Cristóbal Sifón, Henk Hoekstra, Marcello Cacciato +5
Torques acting on galaxies lead to physical alignments, but the resulting ellipticity correlations are difficult to predict. As they constitute a major contaminant for cosmic shear…
Early Observations and Analysis of the Type Ia SN 2014J in M82
G. H. Marion, D. J. Sand, E. Y. Hsiao +23
We present optical and near infrared (NIR) observations of the nearby Type Ia SN 2014J. Seventeen optical and twenty-three NIR spectra were obtained from 10 days before (10d) to…
Constraints on the Progenitor System of the Type Ia Supernova 2014J from Pre-Explosion Hubble Space Telescope Imaging
Patrick L. Kelly, Ori D. Fox, Alexei V. Filippenko +7
We constrain the properties of the progenitor system of the highly reddened Type Ia supernova (SN) 2014J in Messier 82 (M82; d ~ 3.5 Mpc). We determine the SN location using Keck-I…