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SN2023ixf in Messier 101: A Variable Red Supergiant as the Progenitor Candidate to a Type II Supernova
Charles D. Kilpatrick, Ryan J. Foley, Wynn V. Jacobson-Galán +15
We present pre-explosion optical and infrared (IR) imaging at the site of the type II supernova (SN II) 2023ixf in Messier 101 at 6.9 Mpc. We astrometrically registered a ground-ba…
Disentangling Time Series Spectra with Gaussian Processes: Applications to Radial Velocity Analysis
Ian Czekala, Kaisey S. Mandel, Sean M. Andrews +4
Measurements of radial velocity variations from the spectroscopic monitoring of stars and their companions are essential for a broad swath of astrophysics, providing access to the…
SN~2012cg: Evidence for Interaction Between a Normal Type Ia Supernova and a Non-Degenerate Binary Companion
G. H. Marion, Peter J. Brown, Jozsef Vinkó +26
We report evidence for excess blue light from the Type Ia supernova SN 2012cg at fifteen and sixteen days before maximum B-band brightness. The emission is consistent with predicti…
Constructing A Flexible Likelihood Function For Spectroscopic Inference
Ian Czekala, Sean M. Andrews, Kaisey S. Mandel +2
We present a modular, extensible likelihood framework for spectroscopic inference based on synthetic model spectra. The subtraction of an imperfect model from a continuously sample…
The Spectroscopic Diversity of Type Ia Supernovae
S. Blondin, T. Matheson, R. P. Kirshner +9
We present 2603 spectra of 462 nearby Type Ia supernovae (SN Ia) obtained during 1993-2008 through the Center for Astrophysics Supernova Program. Most of the spectra were obtained…