Gießen 2024 – scientific programme

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GR: Fachverband Gravitation und Relativitätstheorie

GR 10: Relativistic Astrophysics I

GR 10.3: Talk

Wednesday, March 13, 2024, 14:40–15:00, HBR 14: HS 2

Accretion Induced Collapse of Rotating White Dwarfs Progenitors — •Luís Felipe Longo Micchi — Friedrich-Schiller Universitat

Studies have proposed accretion-induced collapse (AIC) of white dwarfs (WDs) as possible power engines of short GRBs with extended emission (sGRB+EE). Aware of the recent turmoil around GRB211211A (a known sGRB+EE) origins, we revisited the science case of AICs. In this talk, we will discuss the results of three models of WDs that collapse due to electron capture. Parameterized by their initial angular momentum, we study the influence of rotation in our AIC models. A careful characterization of the multi-messenger emission of these events will be dis- cussed. With a particular focus on gravitational radiation, we will examine their gravitational wave (GW) morphology and their detectability in current and future ground-based GW detectors. We provide estimates of their electromagnetic and neutrino radiation profile and compare them against other supernova-like events. All our models are fully general-relativistic three-dimensional numerical simulations containing a moment-based neutrino radiation transport. The inclusion of magnetic fields is an undergoing extension of our work.

Keywords: White Dwarf; Multimessenger Astronomy; Gravitational Waves