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GR: Fachverband Gravitation und Relativitätstheorie
GR 9: Poster
GR 9.14: Poster
Mittwoch, 2. April 2025, 16:15–18:15, ZHG Foyer 1. OG
Solar-like Flares Generated in Strongly Magnetised Binary Neutron Star Merger Remnants — •Jinliang Jiang1, Harry Ho-yin Ng1, Michail Chabanov1,2, and Luciano Rezzolla1,3,4 — 1Institute for Theoretical Physics, Goethe University, Max-von-Laue-Str. 1, 60438 Frankfurt am Main, Germany — 2Center for Computational Relativity and Gravitation School of Mathematical Sciences, Rochester Institute of Technology, 85 Lomb Memorial Drive, Rochester, New York 14623, USA — 3School of Mathematics, Trinity College, Dublin 2, Ireland — 4Frankfurt Institute for Advanced Studies, Ruth-Moufang-Str. 1, 60438 Frankfurt am Main, Germany
We investigate the impact of the magnetic-field strength on the long-term (i.e., 200ms) and high-resolution (i.e., 150m) evolutions of the ``magnetar'' resulting from the merger of two neutron stars with a realistic equation of state. For sufficiently large magnetic fields, we observe the loss of differential rotation in the merger remnant and the generation of magnetic flares in the outer layers of the remnant that have several similarities with solar flares. These flares, that are driven by various magneto-hydrodynamics instabilities and in particular by the Parker instability, are responsible not only for intense and collimated Poynting flux outbursts, but also for low-latitude emissions. The novel long-term phenomenology presented here offers the possibility of seeking corresponding signatures from the observations of short gamma-ray bursts and hence revealing the existence of a long-lived strongly magnetized remnant.
Keywords: flare; magnetar; binary neutron star merger; long-lived remnant; Parker instability