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10月14日学术报告

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

报告人

Ricard Ardevol

单位

Max Planck Institute for Astrophysics and the Technical University of Munich

报告时间

20161014

上午10:00

报告地点

引力中心三楼会议室

报告题目

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

报告内容

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.

报告人

简介

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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