SEMINÁRIO DO DEPARTAMENTO DE ASTRONOMIA
The connections between the chemical abundances of stars and their exoplanetary systems
a talk by Luan Ghezzi (Observatório do Valongo-UFRJ/Brasil) - Remote
Abstract:
"The stellar metallicity influences the occurrence of giant and small hot exoplanets. However, the role of elements other than iron on planetary formation is still unclear. In this talk, I will discuss the relations between the abundances of 13 chemical elements (Na, Mg, Al, Si, Ca, Sc, Ti, V, Cr, Mn, Co, Ni, and Cu) for a sample of 561 Kepler exoplanet-hosting stars and the radii and orbital periods of their planets. These possible connections are investigated through comparisons between stars that host different planetary systems. I will also discuss the role of alpha elements in the formation of giant planets and examine the depletion of refractory elements in the Sun. The analysis of 25 solar twins in our sample suggests that this chemical peculiarity might be caused by processes other than planetary formation."
Short-Bio:
Luan Ghezzi is a professor at Valongo Observatory at Federal University of Rio de Janeiro, where he coordinates the research group Stars, Exoplanets and Astrobiology (SEA). He obtained his bachelor's degree in Astronomy at Federal University of Rio de Janeiro and completed his PhD in Astronomy at National Observatory (Rio de Janeiro, Brazil). He did post-docs at National Observatory and the Harvard-Smithsonian Center for Astrophysics. His main research interests are the influence of stars in the formation, evolution and architectures of planetary systems, detection and habitability of exoplanets and the search for life. He is also a great enthusiast of scientific outreach.
Google Meet: https://meet.google.com/pcw-gmem-jyi
Link da transmissão: https://www.youtube.com/c/AstronomiaIAGUSP/live