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GR: Fachverband Gravitation und Relativitätstheorie

GR 11: Relativistic Astrophysics

GR 11.3: Vortrag

Donnerstag, 24. März 2022, 11:40–12:00, GR-H2

Non-thermal electromagnetic counterparts to binary neutron star mergers and supernovae — •Vsevolod Nedora — Max-Planck-Institut für Gravitationsphysik, Potsdam, Germany — Universität Potsdam, Potsdam, Germany

In 2017 the merger of two neutron stars was observed in gravitational waves and across the electromagnetic spectrum. The event was associated with the short gamma-ray burst (GRB) GRB170817A, the afterglow from which peaked 160 days after the burst, before starting to decay in agreement with short GRB models. Much later, 1234 days after the burst, a change in the GRB170718A light curve behavior was observed, inconsistent with most GRB models.

We design a new numerical tool to model the synchrotron radiation arising from interactions between the ejected matter and the interstellar medium, employing the recent theoretical advancements in our understanding of relativistic jetted and oblate mildly relativistic outflows.

Assuming that the change of the afterglow is due to an emerging new component (e.g., kilonova ejecta), we investigate the properties of this component by modeling kilonova and GRB afterglows simultaneously. This allows us to take advantage of all the gathered data and obtain new constraints on the dynamics of the ejected matter and NS EOS.