New Frontiers in Transient Astrophysics: Multi-Messenger Insights into Neutron-Star Mergers and Heavy-Element Formation

The detection of GW170817 was a watershed moment in astrophysics, providing the first direct glimpse of a neutron-star merger through both gravitational waves and electromagnetic radiation. This event confirmed that such mergers forge much of the Universe’s heaviest elements, including gold and platinum, and offered unprecedented opportunities to probe fundamental physics—from general relativity to nuclear astrophysics. Many questions remain, however, from the detailed mechanisms of r-process nucleosynthesis to the full diversity of transient phenomena. In this talk, I highlight recent advances in understanding the origin of the heaviest elements and show how multi-messenger observations are reshaping our view of transient astrophysical events.

Biography: Professor Ramirez-Ruiz was born in Mexico, studied physics at the Universidad Nacional Autónoma de México, and pursued his PhD at Cambridge University. He was the John Bahcall Fellow at the Institute for Advanced Study at Princeton before joining the faculty at UCSC, where he is a professor of astrophysics and astronomy and holds the Vera Rubin Presidential Chair. Professor Ramirez-Ruiz is eager to understand our origins and disruptive events in the night sky. He works with computer models to understand the cataclysmic death of stars and recently led efforts to uncover the origin of the heaviest elements in the universe. Ramirez-Ruiz tests out his theories with complex computer simulations that defy the boundaries of human experience and the assumptions we make about the universe. Professor Ramirez-Ruiz research focuses on the violent universe with an emphasis on stellar explosions, transient astrophysics, gravitational wave sources and accretion phenomena. He is particularly interested in understanding the physical processes that govern accretion onto relativistic objects such as black holes and neutron stars. (Credit: https://campusdirectory.ucsc.edu/cd_detail?uid=raruiz)