München 2019 – wissenschaftliches Programm
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GR: Fachverband Gravitation und Relativitätstheorie
GR 12: Gravitational Waves
GR 12.7: Vortrag
Donnerstag, 21. März 2019, 16:00–16:15, HS 4
Gravitational waves and neutrino signals from magneto-rotational stellar core collapse — •Martin Obergaulinger1,2, Miguel Ángel Aloy2, Pablo Cerdá-Durán2, José Antonio Font2, and Alejandro Torres-Forné2,3 — 1Institut für Kernphysik, TU Darmstadt, Germany — 2Departament d'Astronomía i Astrofisica, Universitat de València, Spain — 3Max-Planck-Institut für Gravitationsphysik (Albert-Einstein-Institut), Potsdam, Germany
The collapse of the cores of massive stars to a proto-neutron star (PNS) can power supernova explosions or long gamma-ray bursts and leaves behind either a neutron star or a black hole. The evolution is shaped by the interplay of many complex processes such as relativistic gravity,(magneto-)hydrodynamics, nuclear physics, and neutrino radiation and depends strongly on the pre-collapse state of the core. Direct observational evidence of the inner engine, otherwise obscured by the outer layers of the star, could be provided by gravitational waves (GWs) and neutrinos. Present instruments would be detect signals of galactic events. Their interpretation relies on numerical models. We analysed detailed simulations to connect the GW signal to oscillation modes of the core. Our rapidly rotation stars produce strong, highly variable GW amplitudes. To facilitate the analysis, we performed a detailed analysis of the eigenmodes of the PNS that could be used to extract properties of the PNS from the signal. Furthermore, the models are the sources of intense neutrino emission, which is characterised by a strong asymmetry between emission along the rotational axis and in the equatorial plane.