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The Photospheric Emission of a Short-Duration Gamma-Ray Burst Emerging from a Realistic Binary Neutron Star Merger
Nathan Walker, Davide Lazzati, Tyler Parsotan +1
The almost simultaneous detection of GRB170817A and GW170817 ushered in nearly a decade of interest in binary neutron star mergers and their multi-messenger signals, resulting in a…
The Role of a Neutron Component in the Photospheric Emission of Long-Duration Gamma-Ray Burst Jets
Nathan Walker, Tyler Parsotan, Davide Lazzati
Long-duration gamma-ray bursts (LGRBs), thought to be produced during core-collapse supernovae, may have a prominent neutron component in the outflow material. If present, neutrons…
GRB 191019A: a short gamma-ray burst in disguise from the disk of an active galactic nucleus
Davide Lazzati, Rosalba Perna, Benjamin Gompertz +1
Long and short gamma-ray bursts (GRBs), canonically separated at around 2 seconds duration, are associated with different progenitors: the collapse of a massive star and the merger…
Dynamics of a relativistic jet through magnetized media
Leonardo Garcia-Garcia, Diego Lopez-Camara, Davide Lazzati
The merger of two neutron stars (NSs) produces the emission of gravitational waves, the formation of a compact object surrounded by a dense and magnetized environment, and the laun…
The effects of Time-Variable Absorption due to Gamma-Ray Bursts In Active Galactic Nuclei Accretion Disks
Michael Ray, Davide Lazzati, Rosalba Perna
Both long and short gamma-ray bursts (GRBs) are expected to occur in the dense environments of active galactic nuclei (AGN) accretion disks. As these bursts propagate through the d…
Prompt Emission of Gamma-Ray Bursts in the High-density Environment of Active Galactic Nuclei Accretion Disks
Davide Lazzati, Gustavo Soares, Rosalba Perna
Long and short gamma-ray bursts are traditionally associated with galactic environments, where circumburst densities are small or moderate (few to hundreds of protons per cubic cm)…
Propagation of a realistic magnetar jet through binary neutron star merger medium and implications for short gamma-ray bursts
Gustavo Soares, Pablo Bosch, Davide Lazzati +1
The origin of short gamma-ray bursts (sGRBs) is associated with outflows powered by the remnant of a binary neutron star merger. This remnant can be either a black hole or a highly…
The emergence of diffused Gamma-Ray Burst afterglows from the disks of Active Galactic Nuclei
Yihan Wang, Davide Lazzati, Rosalba Perna
The disks of Active Galactic Nuclei (AGNs) have emerged as rich environments for the production and capture of stars and the compact objects that they leave behind. These stars pro…
GW170817 4.5 years after merger: Dynamical ejecta afterglow constraints
Arvind Balasubramanian, Alessandra Corsi, Kunal P. Mooley +6
GW170817 is the first binary neutron star (NS) merger detected in gravitational waves (GWs) and photons, and so far remains the only GW event of its class with a definitive electro…
Host galaxies and electromagnetic counterparts to binary neutron star mergers across the cosmic time: Detectability of GW170817-like events
Rosalba Perna, M. Celeste Artale, Yi-Han Wang +4
The detection of electromagnetic radiation (EM) accompanying the gravitational wave (GW) signal from the binary neutron star (BNS) merger GW170817 has revealed that these systems c…
Monte Carlo Simulations of Photospheric Emission in Gamma Ray Bursts
Tyler Parsotan, Davide Lazzati
The study of Gamma Ray Bursts (GRBs) has the potential to improve our understanding of high energy astrophysical phenomena. In order to reliably use GRBs to this end, we first need…
Photospheric Prompt Emission From Long Gamma Ray Burst Simulations -- II. Spectropolarimetry
Tyler Parsotan, Davide Lazzati
Although Gamma Ray Bursts (GRBs) have been detected for many decades, the lack of knowledge regarding the radiation mechanism that produces the energetic flash of radiation, or pro…
Two steps forward and one step sideways: the propagation of relativistic jets in realistic binary neutron star merger ejecta
Davide Lazzati, Rosalba Perna, Riccardo Ciolfi +3
The association of GRB170817A with GW170817 has confirmed the long-standing hypothesis that binary neutron star (BNS) mergers are the progenitors of at least some short gamma-ray b…
Photospheric Prompt Emission From Long Gamma Ray Burst Simulations -- I. Optical Emission
Tyler Parsotan, Davide Lazzati
A complete understanding of Gamma Ray Bursts (GRBs) has been difficult to achieve due to our incomplete knowledge of the radiation mechanism that is responsible for producing the p…
The variable absorption in the X-ray spectrum of GRB 190114C
Sergio Campana, Davide Lazzati, Rosalba Perna +2
GRB 190114C was a bright burst that occurred in the local Universe (z=0.425). It was the first gamma-ray burst (GRB) ever detected at TeV energies, thanks to MAGIC. We characterize…
Continued radio observations of GW170817 3.5 years post-merger
Arvind Balasubramanian, Alessandra Corsi, Kunal P. Mooley +6
We present new radio observations of the binary neutron star merger GW170817 carried out with the Karl G. Jansky Very large Array (VLA) more than 3\,yrs after the merger. Our combi…
Electromagnetic Signatures of Relativistic Explosions in AGN Disks
Rosalba Perna, Davide Lazzati, Matteo Cantiello
The disks of Active Galactic Nuclei (AGNs), traditionally studied as the feeders of the supermassive black holes (SMBHs) at their centers, have recently triggered a lot of interest…
Short duration gamma-ray bursts and their outflows in light of GW170817
Davide Lazzati
The detection of GW170817, it's extensive multi-wavelength follow-up campaign, and the large amount of theoretical development and interpretation that followed, have resulted in a…
Photospheric Polarization Signatures From Long Gamma Ray Burst Simulations
Tyler Parsotan, Diego Lopez-Camara, Davide Lazzati
A comprehensive understanding of Gamma Ray Bursts (GRBs) has been elusive due to the variety of questions surrounding the radiation mechanism at play in these events. Polarization…
Intrinsic properties of the engine and jet that powered the short gamma-ray burst associated with GW170817
Davide Lazzati, Riccardo Ciolfi, Rosalba Perna
GRB 170817A was a subluminous short gamma-ray burst detected about 1.74 s after the gravitational wave signal GW170817 from a binary neutron star (BNS) merger. It is now understood…
Polarization constraints on the geometry of the magnetic field in the external shock of gamma-ray bursts
Eric Stringer, Davide Lazzati
We study the ensemble of linear polarization measurement in the optical afterglows of long-duration gamma-ray bursts. We assume a non sideways-expanding top-hat jet geometry and us…
Jet-cocoon outflows from neutron star mergers: structure, light curves, and fundamental physics
Davide Lazzati, Rosalba Perna
The discovery of GW170817, the merger of a binary neutron star (NS) triggered by a gravitational wave detection by LIGO and Virgo, has opened a new window of exploration in the phy…
Gravity and Light: Combining Gravitational Wave and Electromagnetic Observations in the 2020s
R. J. Foley, K. D. Alexander, I. Andreoni +110
As of today, we have directly detected exactly one source in both gravitational waves (GWs) and electromagnetic (EM) radiation, the binary neutron star merger GW170817, its associa…
Limits on electromagnetic counterparts of gravitational wave-detected binary black hole mergers
Rosalba Perna, Davide Lazzati, Will Farr
Unlike mergers of two compact objects containing a neutron star (NS), binary black hole (BBH) mergers are not accompanied by the production of tidally disrupted material, and hence…