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On The Theory of Ring Afterglows
Marcus DuPont, Andrew MacFadyen, Re'em Sari
Synchrotron and inverse Compton emission successfully explain the observed spectra of gamma-ray burst (GRB) afterglows. It is thought that most GRBs are products of extremely relat…
Unstable Mass Transfer from a Main-Sequence Star to a Supermassive Black Hole and Quasi-Periodic Eruptions
Itai Linial, Re'em Sari
We discuss the formation and evolution of systems comprised of a low-mass () main sequence star, orbiting a supermassi…
Shock Breakout from Stellar Envelopes: The relativistic limit
Tamar Faran, Re'em Sari
We calculate the observed luminosity and spectrum following the emergence of a relativistic shock wave from a stellar edges. Shock waves propagating at …
Bolometric light curves of aspherical shock breakout
Christopher Irwin, Itai Linial, Ehud Nakar +2
The shock breakout emission is the first light that emerges from a supernova. In the spherical case it is characterized by a brief UV flash. In an axisymmetric, non-spherical prola…
Revisiting the Strong Shock Problem: Converging and Diverging Shocks in Different Geometries
Elisha Modelevsky, Re'em Sari
Self-similar solutions to converging (implosions) and diverging (explosions) shocks have been studied before, in planar, cylindrical or spherical symmetry. Here we offer a unified…
Partial Stellar Explosions -- Ejected Mass and Minimal Energy
Itai Linial, Jim Fuller, Re'em Sari
Many massive stars appear to undergo enhanced mass loss during late stages of their evolution. In some cases, the ejected mass likely originates from non-terminal explosive outburs…
The Non Relativistic Interiors of Ultra-Relativistic Explosions: Extension to the Blandford McKee Solutions
Tamar Faran, Re'em Sari
The hydrodynamics of an ultrarelativistic flow, enclosed by a strong shock wave, are described by the well known Blandford-McKee solutions in spherical geometry. These solutions, h…
Early supernova emission -- logarithmic corrections to the planar phase
Tamar Faran, Re'em Sari
When the shock wave generated in a supernova explosion breaks out of the stellar envelope, the first photons, typically in the X-ray to UV range, escape to the observer. Following…
Oblique Shock Breakout from a Uniform Density Medium
Itai Linial, Re'em Sari
The emergence of a shock from a medium with a free surface is an important process in various astrophysical phenomena. It generates the first light associated with explosions like…
A Reverse Shock in GRB 181201A
Tanmoy Laskar, Hendrik van Eerten, Patricia Schady +26
We present comprehensive multiwavelength radio to X-ray observations of GRB 181201A spanning from s to days after the burst, comprising the first joint AL…
Recombination Effects on Supernova Light Curves
Tamar Faran, Tomer Goldfriend, Ehud Nakar +1
The light curves of type-II supernovae (SNe) are believed to be highly affected by recombination of hydrogen that takes place in their envelopes. In this work, we analytically inve…
Cooling off with a kilonova - Lower Limit on the Expansion Velocity of GW170817
Itai Linial, Re'em Sari
GW170817 was the first detection of a binary neutron star merger via gravitational waves. The event was observed over a wide range of the electromagnetic spectrum, revealing a ther…
Shock Breakouts from Tidal Disruption Events
Almog Yalinewich, James Guillochon, Re'em Sari +1
Tidal disruption events of stars by supermassive black holes have so far been discovered months to years after the fact. In this paper we explore the short, faint and hard burst of…
Tidal Disruption of Inclined or Eccentric Binaries by Massive Black Holes
Harriet Brown, Shiho Kobayashi, Elena M. Rossi +1
Binary stars that are on close orbits around massive black holes (MBH) such as Sgr A* in the center of the Milky Way are liable to undergo tidal disruption and eject a hypervelocit…
A VLA Study of High-redshift GRBs II - The Complex Radio Afterglow of GRB 140304A: Shell Collisions and Two Reverse Shocks
Tanmoy Laskar, Edo Berger, Raffaella Margutti +6
We present detailed multi-frequency, multi-epoch radio observations of GRB 140304A at from 1 to 86 GHz and 0.45 d to 89 d. The radio and mm data exhibit unusual multiple…
Mass loss through the L2 Lagrange point - Application to Main Sequence EMRI
Itai Linial, Re'em Sari
We consider stable mass transfer from the secondary to the primary of an extreme mass ratio binary system. We show that when the mass transfer is sufficiently fast, mass leakage oc…
Analytic heating rate of neutron star merger ejecta derived from Fermi's theory of beta decay
Kenta Hotokezaka, Re'em Sari, Tsvi Piran
Macronovae (kilonovae) that arise in binary neutron star mergers are powered by radioactive beta decay of hundreds of -process nuclides. We derive, using Fermi's theory of beta…
Analytic Asymptotic Solution to Spherical Relativistic Shock Breakout
Almog Yalinewich, Re'em Sari
We investigate the relativistic breakout of a shock wave from the surface of a star. In this process, each fluid shell is endowed with some kinetic and thermal energy by the shock,…
The Spectral Sharpness Angle of Gamma-ray Bursts
Hoi-Fung Yu, Hendrik J. van Eerten, Jochen Greiner +5
We explain the results of Yu et al. (2015b) of the novel sharpness angle measurement to a large number of spectra obtained from the Fermi gamma-ray burst monitor. The sharpness ang…
Asymptotic Steady State Solution to a Bow Shock with an Infinite Mach Number
Almog Yalinewich, Re'em Sari
The problem of a cold gas flowing past a stationary object is considered. It is shown that at large distances from the obstacle the shock front forms a parabolic solid of revolutio…
The sharpness of gamma-ray burst prompt emission spectra
Hoi-Fung Yu, Hendrik J. van Eerten, Jochen Greiner +5
We aim to obtain a measure of the curvature of time-resolved spectra that can be compared directly to theory. This tests the ability of models such as synchrotron emission to expla…
Discrete Self Similarity in Filled Type I Strong Explosions
Almog Yalinewich, Re'em Sari
We present new solutions to the strong explosion problem in a non power law density profi{}le. The unperturbed self similar solutions developed by Sedov, Taylor and Von Neumann des…
Angular Density Perturbations to Filled Type I Strong Explosions
Almog Yalinewich, Re'em Sari
In this paper we extend the Sedov - Taylor - Von Neumann model for a strong explosion to account for small angular and radial variations in the density. We assume that the density…
The afterglow of a relativistic shock breakout and low-luminosity GRBs
Rodolfo Barniol Duran, Ehud Nakar, Tsvi Piran +1
The prompt emission of low-luminosity gamma-ray bursts (llGRBs) indicates that these events originate from a relativistic shock breakout. In this case we can estimate, based on the…