Data: 28.09.2023

Palestrante: Dr. Valerio Carruba (UNESP)

Link: https://youtube.com/live/NOgemHW7mo8

Resumo: Linear secular resonances happen when there is a commensurability between the precession frequency of the pericenter, g, or longitude of the node, s, of an asteroid and a planet. Non-linear resonances are higher-order combinations of these frequencies. We studied the three most diffusive g-type non-linear secular resonances using Artificial Neural Networks. We identified a population of more than 2000 resonant objects in the g-g6, g-2g6+g5, and g-3g6+2g5 resonances. This allows the creation of Convolutional Neural Network models for the g-g6 and g-2g6+g5 resonance, able to predict the status of several thousands of asteroids in seconds. We identified the 12988 Tiffanykapler, 5507 Nijima, and 170776 2004 CA95 asteroid families among the resonant population, which have all estimated ages of less than 7 My. These are the three first-ever identified young families in resonant configurations of the studied resonances, which allows for setting limits on their original ejection velocity field. Collisional models of the main belt suggest that several more new asteroid families in such configurations will be likely discovered once the new data from the LSST survey will become available, allowing for a better understanding of the processes behind asteroid family formation.