The Colloquium takes place every Wednesday at 11:15 AM - Warsaw Copernicus Astronomical Centre online by means of Zoom platform. The Colloquium is given in English and chaired by dr Stanisław Bajtlik (contact mail seminar@camk.edu.pl). People from outside of the Copernicus Center are very welcome to participate. For technical detailes please contact Dr. Stanislaw Bajtlik (bajtlik@camk.edu.pl).
Agnieszka Janiuk (CFT PAN)
The observations of the gravitational wave source, the compact binary merger GW170817, revealed the presence of a short GRB, emitted by a relativistic jet, and a kilonova powered by heavy-element nucleosynthesis. A multi-component picture of the post-merger system is needed to explain the complex phenomenology of this source. I will present recent results of our GR MHD simulations, based on detailed microphysics, neutrino cooling, and radiative transfer, that are focused on the role of accretion disk winds. A related open question here is how the lifetime of a hypermassive neutron star, possibly formed after the merger and ultimately undergoing collapse to a black hole, shapes the ejecta. In the second part of the talk, I'll briefly discuss the hidden evolution of GRB jets that may be revealed by their GW signals. It can be shown that detections of GWs from nearby long GRBs and Type Ic SNe could help constrain the mechanisms operating in their central engines. Finally, I will highlight recent developments of numerical techniques by our group, related to self-gravitating collapsar models.
Journal Club takes place on Mondays at 11:15 AM in the Seminar Room. The presentation is given in English and is chaired by Journal Club Coordinators. Anyone interested in giving a Journal Club talk is encouraged to contact the email: journalclub(@camk.edu.pl).
Arthur Silva Magalhães (NCAC, Warsaw)
