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The Type IIb Supernova 2013df and Its Cool Supergiant Progenitor
Schuyler D. Van Dyk, WeiKang Zheng, Ori D. Fox +10
We have obtained early-time photometry and spectroscopy of Supernova (SN) 2013df in NGC 4414. The SN is clearly of Type IIb, with notable similarities to SN 1993J. From its luminos…
SN 2009N: Linking normal and subluminous type II-P SNe
K. Takáts, M. L. Pumo, N. Elias-Rosa +31
We present ultraviolet, optical, near-infrared photometry and spectroscopy of SN 2009N in NGC 4487. This object is a type II-P supernova with spectra resembling those of subluminou…
Galactic Evolved Massive Stars Discovered by Their Infrared Emission
A. P. Marston, J. Mauerhan, S. Van Dyk +2
Determining the Galactic distribution and numbers of massive stars, such as Wolf-Rayet stars (WRs), is hampered by intervening Galactic or local circumstellar dust obscuration. In…
Nebular spectroscopy of the nearby type IIb supernova 2011dh
Isaac Shivvers, Paolo Mazzali, Jeffrey M. Silverman +6
We present nebular spectra of the nearby Type IIb supernova (SN) 2011dh taken between 201 and 678 days after core collapse. At these late times, SN 2011dh exhibits strong emission…
An Echo of Supernova 2008bk
Schuyler D. Van Dyk
I have discovered a prominent light echo around the low-luminosity Type II-Plateau Supernova (SN) 2008bk in NGC 7793, seen in archival images obtained with the Wide Field Channel o…
The Progenitor of Supernova 2011dh Has Vanished
Schuyler D. Van Dyk, WeiKang Zheng, Kelsey I. Clubb +7
We conducted Hubble Space Telescope (HST) Snapshot observations of the Type IIb Supernova (SN) 2011dh in M51 at an age of ~641 days with the Wide Field Camera 3. We find that the y…
Late-Time Dust Emission from the Type IIn Supernova 1995N
Schuyler D. Van Dyk
The Type IIn supernovae (SNe IIn) have been found to be associated with significant amounts of dust. These core-collapse events are generally expected to be the final stage in the…