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Zooming In on the Progenitors of Superluminous Supernovae With the HST
R. Lunnan, R. Chornock, E. Berger +25
We present Hubble Space Telescope (HST) rest-frame ultraviolet imaging of the host galaxies of 16 hydrogen-poor superluminous supernovae (SLSNe), including 11 events from the Pan-S…
Dust in the wind: the role of recent mass loss in long gamma-ray bursts
Raffaella Margutti, C. Guidorzi, D. Lazzati +6
We study the late-time (t>0.5 days) X-ray afterglows of nearby (z<0.5) long Gamma-Ray Bursts (GRB) with Swift and identify a population of explosions with slowly decaying, super-so…
On the Nature of Type Ia-CSM Supernovae: Optical and Near-Infrared Spectra of SN 2012ca and SN 2013dn
Ori D. Fox, Jeffrey M. Silverman, Alexei V. Filippenko +17
A growing subset of Type Ia supernovae (SNe Ia) show evidence for unexpected interaction with a dense circumstellar medium (SNe Ia-CSM). The precise nature of the progenitor, howev…
The Broad-Lined Type Ic SN 2012ap and the Nature of Relativistic Supernovae Lacking a Gamma-ray Burst Detection
D. Milisavljevic, R. Margutti, J. T. Parrent +20
We present ultraviolet, optical, and near-infrared observations of SN 2012ap, a broad-lined Type Ic supernova in the galaxy NGC 1729 that produced a relativistic and rapidly decele…
No X-rays from the very nearby Type Ia SN2014J: constraints on its environment
R. Margutti, J. Parrent, A. Kamble +5
Deep X-ray observations of the post-explosion environment around the very nearby Type Ia SN\,2014J (Dl=3.5 Mpc) reveal no X-ray emission down to a luminosity L<7x10^{36} erg/s (0.3…
Rapidly-Evolving and Luminous Transients from Pan-STARRS1
M. R. Drout, R. Chornock, A. M. Soderberg +33
In the past decade, several rapidly-evolving transients have been discovered whose timescales and luminosities are not easily explained by traditional supernovae (SN) models. The s…
Optical spectroscopic observations of gamma-ray blazars candidates I: preliminary results
A. Paggi, D. Milisavljevic, N. Masetti +13
A significant fraction ( %) of the gamma-ray sources listed in the second LAT (2FGL) catalog is still of unknown origin, being not yet associated with cou…
Towards Characterization of the Type IIP Supernova Progenitor Population: a Statistical Sample of Light Curves from Pan-STARRS1
N. E. Sanders, A. M. Soderberg, S. Gezari +30
In recent years, wide-field sky surveys providing deep multi-band imaging have presented a new path for indirectly characterizing the progenitor populations of core-collapse supern…
A Mid-life crisis? Sudden Changes in Radio and X-Ray Emission from Supernova 1970G
Jason A Dittmann, Alicia M. Soderberg, Laura Chomiuk +4
Supernovae provide a backdrop from which we can probe the end state of stellar evolution in the final years before the progenitor star explodes. As the shock from the supernova exp…
Relativistic supernovae have shorter-lived central engines or more extended progenitors: the case of SN\,2012ap
R. Margutti, D. Milisavljevic, A. M. Soderberg +10
Deep late-time X-ray observations of the relativistic, engine-driven, type Ic SN2012ap allow us to probe the nearby environment of the explosion and reveal the unique properties of…
A Missing-Link in the Supernova-GRB Connection: The Case of SN 2012ap
Sayan Chakraborti, Alicia Soderberg, Laura Chomiuk +50
Gamma Ray Bursts (GRBs) are characterized by ultra-relativistic outflows, while supernovae are generally characterized by non-relativistic ejecta. GRB afterglows decelerate rapidly…
Interaction Between The Broad-lined Type Ic Supernova 2012ap and Carriers of Diffuse Interstellar Bands
D. Milisavljevic, R. Margutti, K. N. Crabtree +18
The diffuse interstellar bands (DIBs) are absorption features observed in optical and near-infrared spectra that are thought to be associated with carbon-rich polyatomic molecules…
SN2011hs: a Fast and Faint Type IIb Supernova from a Supergiant Progenitor
F. Bufano, G. Pignata, M. Bersten +33
Observations spanning a large wavelength range, from X-ray to radio, of the Type IIb supernova 2011hs are presented, covering its evolution during the first year after explosion. T…