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2016年10月14日 德国马普所Ardevol博士学术报告

发布时间:2016-09-30          来源:办公室           浏览次数:


Ricard Ardevol


Max Planck Institute for  Astrophysics and the Technical University of Munich







The Quest for  Gold: r-process Element Production in Compact Object Mergers


It is generally accepted that the  mechanism by which the heavy, neutron-rich elements found on Earth, like gold  or uranium, are synthesized is the so-called rapid neutron capture process or  simply r-proces. Its astrophysical origin, however, remains a mystery. For a  long time, supernova explosions were the most promising scenario, but state  of the art numerical simulations are not able to reproduce the necessary  conditions for the r-process to occur. In contrast, compact object mergers,  such as two neutron stars (NSNS) or a neutron star and a black hole (NS-BH),  have shown to be a robust alternative. Not only a non negligible amount of  matter is unbound in such events, but also the high densities and neutron  richness of neutron star material offers optimal conditions for the r-process  nucleosynthesis.

The most common remnant of the merger of a  NS-NS or a NS-BH system is a black hole surrounded by a torus of neutron star  matter (BH-torus). We performed numerical simulations of the merger of two  compact objects (NS-NS and NS-BH) and of the long term evolution of the  BH-torus system, and carried out nucleosynthesis calculations of the ejecta  in a postprocessing step. By taking into account the material which gets unbound from the torus, due to neutrino-driven  winds or viscous transport, in addition of the dynamical ejecta from the  merger, we can reproduce strikingly well the solar element abundances for  A>90. Furthermore, if we assume that all the heavy r-process material  observed in our galaxy has been produced in compact object mergers, we can estimate  the galactic merger rate. The possible forthcoming detection of gravitational  waves from NS-NS or NS-BH mergers by the advanced LIGO detectors will provide  invaluable information about this fascinating astrophysical site.



Max Planck Institute for Astrophysics and the Technical University of  Munich.

“Licenciatura” degree of Physics at the University of  Barcelona, Spain



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