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Strong Near-Infrared Carbon Absorption in the Transitional Type Ia SN 2015bp
S. D. Wyatt, D. J. Sand, E. Y. Hsiao +20
Unburned carbon is potentially a powerful probe of Type Ia supernova (SN) explosion mechanisms. We present comprehensive optical and near-infrared (NIR) data on the "transitional"…
The electron-capture origin of supernova 2018zd
Daichi Hiramatsu, D. Andrew Howell, Schuyler D. Van Dyk +27
In the transitional mass range ( 8-10 solar masses) between white dwarf formation and iron core-collapse supernovae, stars are expected to produce an electron-capture superno…
Supernova 2018cuf: A Type IIP supernova with a slow fall from plateau
Yize Dong, S. Valenti, K. A. Bostroem +34
We present multi-band photometry and spectroscopy of SN 2018cuf, a Type IIP ("P" for plateau) supernova (SN) discovered by the Distance Less Than 40 Mpc survey (DLT40) within 24 ho…
SN 2018gjx reveals that some SNe Ibn are SNe IIb exploding in dense circumstellar material
S. J. Prentice, K. Maguire, I. Boian +27
We present the data and analysis of SN 2018gjx, an unusual low-luminosity transient with three distinct spectroscopic phases. Phase I shows a hot blue spectrum with signatures of i…
The Blue Supergiant Progenitor of the Supernova Imposter AT~2019krl
Jennifer E. Andrews, Jacob E. Jencson, Schuyler D. Van Dyk +20
Extensive archival \textit{Hubble Space Telescope}, \textit{Spitzer Space Telescope}, and Large Binocular Telescope imaging of the recent intermediate-luminosity transient, AT~2019…
SN 2017ivv: two years of evolution of a transitional Type II supernova
C. P. Gutiérrez, A. Pastorello, A. Jerkstrand +39
We present the photometric and spectroscopic evolution of the Type II supernova (SN II) SN 2017ivv (also known as ASASSN-17qp). Located in an extremely faint galaxy (M ma…
The Exotic Type Ic Broad-Lined Supernova SN 2018gep: Blurring the Line Between Supernovae and Fast Optical Transients
T. A. Pritchard, Katarzyna Bensch, Maryam Modjaz +28
In the last decade a number of rapidly evolving transients have been discovered that are not easily explained by traditional supernovae models. We present optical and UV data on on…
The early discovery of SN 2017ahn: signatures of persistent interaction in a fast declining Type II supernova
L. Tartaglia, D. J. Sand, J. H. Groh +25
We present high-cadence, comprehensive data on the nearby () Type II SN 2017ahn, discovered within 1 day of explosion, from the very early phases after e…