Scientific Program

8:30/15:30 (15+5) Fabio De Colle                                                                                      Observations and models of off-axis GRBs

                      As the GRB jet moves through the environment, shocked material expands laterally forming an extended, entropy rich cocoon. In this talk, I will present numerical simulations of gamma-ray burst seen off-axis, discussing in detail the role played by the cocoon in shaping the observed light curves and spectrum.
 
8:50/15:50 (15+5) Gerardo Urrutia                                        What Determine The Structure Of Short Gamma-Ray Burst Jets?

                      The discovery of the first unambiguous off-axis gamma-ray burst has improved our understanding of the structure of gamma-ray burst jets.  The late afterglow of GRB 170817A, in particular, is well fitted by a structured jet seen slightly off-axis (at∼30º). It has been shown that the GRB structure is determined by the interaction between the jet, produced by the central  engine, and the environment. In this work, we study what determine the final structure of the jet seen in SGRBs. We run numerical simulations of jets launched with different structure,  duration, luminosity, and ejection time history. We follow their interaction with the environment  e.g., the neutrino wind-driven launched during the coalescence of neutron stars) and compute the final structure of the jet at distances ∼10^11 cm from the central engine. VIDEO

9:10+16:10 (5+5) Roshan Jaisimha Dattatri                                                                    Inferring the structured jet profiles of GRBs

                           The first gravitational wave (GW) observation of a system of coalescing neutron stars GW170817 and its localisation led to a historic first association of a GW source with a short duration gamma-ray burst GRB170817. The subsequent electromagnetic follow-up campaign was ground-breaking and other than firmly establishing the short gamma-ray burst – binary neutron star association, provided evidence that the low luminosity of GRB170817 (orders of magnitude below the average) was the result of a prompt emission observed at a wide viewing angle. Howell et al. (2019) inferred the structured jet profile of GRB170817A and showed that the model was in agreement with the Fermi short gamma-ray burst detection rate. They used the model for predicting future joint GW- gamma-ray burst detection rates. In this talk after presenting some of the key results of this work I discuss my work in exploring and extending the framework of Howell et al. (2019) to include additional parameters. VIDEO

9:20/16:20 COFFEE BREAK

9:35/16:35 (15+5) Diego López Cámara.                    Short GRB breaking out of the ejected material of a NS-NS merger... live and in 3D

                             In this talk I will show how a short GRB (alike GRB170817A) breaks out of the ejected material (formed during the merger of two NSs) and onto the ambient medium. The latter is done by performing an extremely demanding 3D  RHD simulation of a relativistic and collimated jet drilling through the final snapshot of the NS-NS merger simulation of Ciolfi (2017). Popcorn is not included in the movie. VIDEO


9:55/16:55 (15+5) Fernanda Clever                                                    Angular momentum effects in the evolution of a relativistic jet through a massive progenitor using 3D-RHD numerical simulations

                            The effects of the high angular momentum in pre-supernova progenitor models are an important factor that must be considered during the evolution of the relativistic jet through the massive envelope in the LGRB scenario. Previous studies have analysed such effects by using RHD simulations but have not considered different angular momentum settings. In this talk, I will show the three-dimensional results of how different angular momentum distributions affect the pre-supernova progenitor 16TI of Woosley and Heger (2006). Additionally, I will present a preview of the 3D-RHD simulations of a relativistic jet drilling through the rapidly rotating progenitor. VIDEO

10:15/17:15 (15+5) Nissim Fraija                                                                                                                  Light curves from magnetars

                             VIDEO      

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10:35/17:35 (15+5) Enrique Moreno Méndez                                                Jets in common envelopes with compact objects

 

                             Many high-energy transient events require the presence of a compact object (CO; a black hole or a neutron star) in close proximity to a companion star (or another CO). In many such instances, the orbital separation is smaller than the ZAMS radius of the star that produced the CO(s). The most likely channel for producing such close, massive binaries is Common-Envelope (CE) evolution. However, this important evolutionary stage is still poorly understood. In this talk, I will address a scenario where the CO accretes high-angular-momentum material from the companion, forms an accretion disk, and launches jets within the CE. VIDEO

10:55/17:55 COFFEE BREAK

11:05/18:05 DISCUSSION VIDEO