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Delayed Circumstellar Interaction for Type Ia SN 2015cp Revealed by an HST Ultraviolet Imaging Survey
M. L. Graham, C. E. Harris, P. E. Nugent +11
The nature and role of the binary companion of carbon-oxygen white dwarf stars that explode as Type Ia supernovae (SNe Ia) are not yet fully understood. Past detections of circumst…
Late-time observations of the extraordinary Type II supernova iPTF14hls
J. Sollerman, F. Taddia, I. Arcavi +22
We study iPTF14hls, a luminous and extraordinary long-lived Type II supernova, which lately has attracted much attention and disparate interpretation. We present new optical photom…
SN 2016esw: a luminous Type II supernova observed within the first day after the explosion
Thomas de Jaeger, Lluis Galbany, Claudia P. Gutiérrez +18
We present photometry, spectroscopy, and host-galaxy integral-field spectroscopy of the Type II supernova (SN) 2016esw in CGCG~229-009 from the first day after the explosion up to…
Stripped-envelope supernova SN 2004dk is now interacting with hydrogen-rich circumstellar material
Jon C. Mauerhan, Alexei V. Filippenko, Weikang Zheng +4
The dominant mechanism and time scales over which stripped-envelope supernovae (SNe) progenitor stars shed their hydrogen envelopes are uncertain. Observations of Type Ib and Ic SN…
SN 2017ein and the Possible First Identification of a Type Ic Supernova Progenitor
Schuyler D. Van Dyk, WeiKang Zheng, Thomas G. Brink +11
We have identified a progenitor candidate in archival Hubble Space Telescope (HST) images for the Type Ic SN 2017ein in NGC 3938, pinpointing the candidate's location via HST Targe…
A surge of light at the birth of a supernova
M. C. Bersten, G. Folatelli, F. García +18
It is difficult to establish the properties of massive stars that explode as supernovae. The electromagnetic emission during the first minutes to hours after the emergence of the s…