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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…
The Very Young Type Ia Supernova 2013dy: Discovery, and Strong Carbon Absorption in Early-Time Spectra
WeiKang Zheng, Jeffrey M. Silverman, Alexei V. Filippenko +20
The Type Ia supernova (SN Ia) 2013dy in NGC 7250 (d ~ 13.7 Mpc) was discovered by the Lick Observatory Supernova Search. Combined with a prediscovery detection by the Italian Super…
Type-Ia Supernova Rates to Redshift 2.4 from CLASH: the Cluster Lensing And Supernova survey with Hubble
O. Graur, S. A. Rodney, D. Maoz +38
We present the supernova (SN) sample and Type-Ia SN (SN Ia) rates from the Cluster Lensing And Supernova survey with Hubble (CLASH). Using the Advanced Camera for Surveys and the W…
Evidence that Gamma-ray Burst 130702A Exploded in a Dwarf Satellite of a Massive Galaxy
Patrick L. Kelly, Alexei V. Filippenko, Ori D. Fox +2
GRB 130702A is a nearby long-duration gamma-ray burst (LGRB) discovered by the Fermi satellite whose associated afterglow was detected by the Palomar Transient Factory. Subsequent…
The Afterglow of GRB 130427A from 1 to 10^16 GHz
D. A. Perley, S. B. Cenko, A. Corsi +31
We present multiwavelength observations of the afterglow of GRB 130427A, the brightest (in total fluence) gamma-ray burst of the past 29 years. Optical spectroscopy from Gemini-Nor…
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…
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…
The Lick AGN Monitoring Project 2011: Fe II Reverberation from the Outer Broad-Line Region
Aaron J. Barth, Anna Pancoast, Vardha N. Bennert +26
The prominent broad Fe II emission blends in the spectra of active galactic nuclei have been shown to vary in response to continuum variations, but past attempts to measure the rev…
Two new SB2 binaries with main sequence B-type pulsators in the Kepler field
P. I. Pápics, A. Tkachenko, C. Aerts +15
Context: OB stars are important in the chemistry and evolution of the Universe, but the sample of targets well understood from an asteroseismological point of view is still too lim…
Type Ia Supernovae Strongly Interacting with Their Circumstellar Medium
Jeffrey M. Silverman, Peter E. Nugent, Avishay Gal-Yam +31
Owing to their utility for measurements of cosmic acceleration, Type Ia supernovae (SNe) are perhaps the best-studied class of SNe, yet the progenitor systems of these explosions l…
Late-Time Circumstellar Interaction in a Spitzer Selected Sample of Type IIn Supernovae
Ori D. Fox, Alexei V. Filippenko, Michael F. Skrutskie +4
Type IIn supernovae (SNe IIn) are a rare (< 10%) subclass of core-collapse SNe that exhibit relatively narrow emission lines from a dense, pre-existing circumstellar medium (CSM).…
Spectroscopic Observations of SN 2012fr: A Luminous Normal Type Ia Supernova with Early High Velocity Features and Late Velocity Plateau
M. J. Childress, R. A. Scalzo, S. A. Sim +55
We present 65 optical spectra of the Type Ia supernova SN 2012fr, of which 33 were obtained before maximum light. At early times SN 2012fr shows clear evidence of a high-velocity f…