2/15/2018 - The Origin of R-Process Elements: Recent Constraints from the Neutron Star Merger GW170817

Information:

12:00 PM - 1:00 PM
Slichter 3853

Presented By:
Maria Drout - Carnegie Observatory

Abstract

It has long been realized that approximately half of the elements heavier than iron are formed via a process known as rapid-neutron capture (r-process) nucleosynthesis. However, it has been less clear where the r-process predominantly occurs, with proposed sites including core-collapse supernovae and neutron star mergers. In this talk I will give a broad overview of our current understanding of the origin of r-process elements, with an emphasis on results from the recent discovery of an electromagnetic counterpart to the neutron star merger GW170817. I will review our previous constraints on the origin of the r-process elements from both theory and observations of metal-poor stars. I will then describe the optical and infrared emission associated with the the binary neutron star merger, GW170817, and place these new results in context. I will discuss the implications of these observations on our understanding of the ejecta from neutron star mergers, the synthesis of r-process elements, and the enrichment of the interstellar medium with this material.

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