Heidelberg 2015 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 58: Nuclear Astrophysics 4
HK 58.5: Vortrag
Donnerstag, 26. März 2015, 18:00–18:15, K/HS2
Nucleosynthesis in Neutrino-driven Winds after Neutron Star Mergers⋆ — •Dirk Martin1, Albino Perego1, and Almudena Arcones1,2 — 1Institut für Kernphysik, TU Darmstadt, Germany — 2GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany
Neutron star mergers (NSMs) are a unique site in astrophysics. They are the most promising scenario for the origin of heavy elements via the rapid neutron capture process (r-process). Moreover, coalescing neutron stars represent also a major source of gravitational waves and are the best candidates to explain short gamma-ray bursts.
NSMs comprise three kinds of neutron-rich ejecta: dynamic ejecta due to tidal torques, neutrino-driven winds and evaporating matter from the accretion disc by viscous heating as well as recombination.
We carried out nucleosynthesis calculations based on a recent simulation of the neutrino-driven wind from a NSM [1]. We find that elements up to the second r-process peak (A 130) are created in the disk ejecta [2]. These yields complement the robust formation of heavy elements including the third r-process peak (A ∼ 195) in the dynamic ejecta. Our results also reveal dependencies on the observation angle and the black hole formation time.
[1] A. Perego et al., 2014, MNRAS, 443, 3134.
[2] D. Martin et al., in preparation.
⋆ Supported by Helmholtz-University Young Investigator grant No. VH-NG-825.