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Close, bright and boxy: the superluminous SN 2018hti
A. Fiore, S. Benetti, M. Nicholl +37
SN 2018hti was a very nearby (z=0.0614) superluminous supernova with an exceedingly bright absolute magnitude of -21.7 mag in r-band at maximum. The densely sampled pre-maximum lig…
Target of Opportunity Observations of Gravitational Wave Events with Vera C. Rubin Observatory
Igor Andreoni, Raffaella Margutti, Om Sharan Salafia +52
The discovery of the electromagnetic counterpart to the binary neutron star merger GW170817 has opened the era of gravitational-wave multi-messenger astronomy. Rapid identification…
Less than 1% of Core-Collapse Supernovae in the local universe occur in elliptical galaxies
I. Irani, S. J. Prentice, S. Schulze +39
We present observations of three Core-collapse supernovae (CCSNe) in elliptical hosts, detected by the Zwicky Transient Facility Bright Transient Survey (BTS). SN 2019ape is a SN I…
Transitional events in the spectrophotometric regime between stripped envelope and superluminous supernovae
S. J. Prentice, C. Inserra, S. Schulze +24
The division between stripped-envelope supernovae (SE-SNe) and superluminous supernovae (SLSNe) is not well defined in either photometric or spectroscopic space. While a sharp lumi…
Optical Observations and Modeling of the Superluminous Supernova 2018lfe
Yao Yin, Sebastian Gomez, Edo Berger +3
We present optical imaging and spectroscopy of SN\,2018lfe, which we classify as a Type I superluminous supernova (SLSN-I) at a redshift of with a peak absolute magnit…
Bumpy Declining Light Curves Are Common in Hydrogen-poor Superluminous Supernovae
Griffin Hosseinzadeh, Edo Berger, Brian D. Metzger +3
Recent work has revealed that the light curves of hydrogen-poor (Type I) superluminous supernovae (SLSNe), thought to be powered by magnetar central engines, do not always follow t…
SN 2018bsz: significant dust formation in a nearby superluminous supernova
T. -W. Chen, S. J. Brennan, R. Wesson +41
We investigate the thermal emission and the extinction from dust associated with the nearby (z = 0.0267) superluminous supernova (SLSN) 2018bsz. Our dataset combines daily-cadence,…
A detailed spectroscopic study of Tidal Disruption Events
P. Charalampopoulos, G. Leloudas, D. B. Malesani +19
Spectroscopically, TDEs are characterized by broad ( 10 km/s) emission lines and show large diversity as well as different line profiles. After carefully and consistently per…
SN 2018agk: A Prototypical Type Ia Supernova with a Smooth Power-law Rise in Kepler (K2)
Qinan Wang, Armin Rest, Yossef Zenati +73
We present the 30-min cadence Kepler/K2 light curve of the Type Ia supernova (SN Ia) SN 2018agk, covering approximately one week before explosion, the full rise phase and the decli…
Constraints on compact binary merger evolution from spin-orbit misalignment in gravitational-wave observations
B. P. Gompertz, M. Nicholl, P. Schmidt +2
The identification of the first confirmed neutron star - black hole (NS-BH) binary mergers by the LIGO, Virgo and KAGRA collaboration provides the opportunity to investigate the pr…
SN 2019hcc: A Type II Supernova Displaying Early O II Lines
Eleonora Parrag, Cosimo Inserra, Steve Schulze +18
We present optical spectroscopy together with ultraviolet, optical and near-infrared photometry of SN 2019hcc, which resides in a host galaxy at redshift 0.044, displaying a sub-so…
SN 2020cpg: an energetic link between type IIb and Ib supernovae
K. Medler, P. A. Mazzali, J. Teffs +18
Stripped-envelope supernovae (SE-SNe) show a wide variety of photometric and spectroscopic properties. This is due to the different potential formation channels and the stripping m…
Late-Time Hubble Space Telescope Observations of a Hydrogen-Poor Superluminous Supernova Reveal the Power-Law Decline of a Magnetar Central Engine
Peter K. Blanchard, Edo Berger, Matt Nicholl +3
The light curve diversity of hydrogen-poor superluminous supernovae (SLSNe) has kept open the possibility that multiple power sources account for the population. Specifically, pair…
Evidence for X-ray Emission in Excess to the Jet Afterglow Decay 3.5 yrs After the Binary Neutron Star Merger GW 170817: A New Emission Component
A. Hajela, R. Margutti, J. S. Bright +34
For the first years after the binary neutron star merger event GW 170817 the radio and X-ray radiation has been dominated by emission from a structured relativistic off-axi…
The Luminous and Double-Peaked Type Ic Supernova 2019stc: Evidence for Multiple Energy Sources
Sebastian Gomez, Edo Berger, Griffin Hosseinzadeh +3
We present optical photometry and spectroscopy of SN\,2019stc (=ZTF19acbonaa), an unusual Type Ic supernova (SN Ic) at a redshift of . SN\,2019stc exhibits a broad double-…
Real-time Discovery of AT2020xnd: A Fast, Luminous Ultraviolet Transient with Minimal Radioactive Ejecta
Daniel A. Perley, Anna Y. Q. Ho, Yuhan Yao +29
The many unusual properties of the enigmatic AT2018cow suggested that at least some subset of the empirical class of fast blue optical transients (FBOTs) represents a genuinely new…
Core-collapse supernova subtypes in luminous infrared galaxies
E. Kankare, A. Efstathiou, R. Kotak +34
We present the discovery and follow-up observations of two CCSNe that occurred in the luminous infrared galaxy (LIRG), NGC3256. The first, SN2018ec, was discovered using the ESO HA…
Progenitor, environment, and modelling of the interacting transient, AT 2016jbu (Gaia16cfr)
S. J. Brennan, M. Fraser, J. Johansson +67
We present the bolometric lightcurve, identification and analysis of the progenitor candidate, and preliminary modelling of AT2016jbu (Gaia16cfr). We find a progenitor consistent w…
Photometric and spectroscopic evolution of the interacting transient AT 2016jbu (Gaia16cfr)
S. J. Brennan, M. Fraser, J. Johansson +68
We present the results from a high cadence, multi-wavelength observation campaign of AT 2016jbu (aka Gaia16cfr), an interacting transient. This dataset complements the current lite…
A Late-Time Galaxy-Targeted Search for the Radio Counterpart of GW190814
K. D. Alexander, G. Schroeder, K. Paterson +14
GW190814 was a compact object binary coalescence detected in gravitational waves by Advanced LIGO and Advanced Virgo that garnered exceptional community interest due to its excelle…
Tight multi-messenger constraints on the neutron star equation of state from GW170817 and a forward model for kilonova light curve synthesis
Matt Nicholl, Ben Margalit, Patricia Schmidt +3
We present a rapid analytic framework for predicting kilonova light curves following neutron star (NS) mergers, where the main input parameters are binary-based properties measurab…