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astro-ph.HE2018★ 26 cited
Significant Luminosity Differences of Two Twin Type Ia Supernovae
Ryan J. Foley, Samantha L. Hoffmann, Lucas M. Macri +5
The Type Ia supernovae (SNe Ia) 2011by, hosted in NGC 3972, and 2011fe, hosted in M101, are optical "twins," having almost identical optical light-curve shapes, colours, and near-m…
astro-ph.CO2018★ 76 cited
A Near-Infrared Period-Luminosity Relation for Miras in NGC 4258, an Anchor for a New Distance Ladder
Caroline D. Huang, Adam G. Riess, Samantha L. Hoffmann +8
We present year-long, near-infrared Hubble Space Telescope WFC3 observations of Mira variables in the water megamaser host galaxy NGC 4258. Miras are AGB variables that can be divi…