Seminario online: Gabriele Cozzo (UniPA), 17 Settembre, ore 15

Stanza Google Meet: meet.google.com/sxz-cctp-tsc

Speaker: Gabriele Cozzo (UniPA)

Titolo: “Study of the accretion phenomena of T Tauri stars with the GRAVITY instrument”

Abstract
Accretion through circumstellar disks plays a fundamental role in the process of star formation. Characterising how accretion works in the context of young stellar objects will also help us to constrain the properties of the regions in which planets form and migrate. The accretion mechanism in low-mass pre-main-sequence stars (T Tauri Stars) is driven by the stellar magnetic field, which disrupts the disk at the magnetospheric radius, generally located at scales of order a few stellar radii. Almost bipolar field lines channel the material from the disk to the star, which ends with shocking at the stellar surface at near free-fall velocities. From decades, the technological improvement has driven the development of new ways to probe faint and distant objects as Classical T Tauri stars are and disentangle the multifarious physical processes involved in sustaining the stars’ evolution. The state-of-the-art in interferometry science has indeed attained unprecedented capabilities in terms of angular resolutions. This new potentiality, coupled with the purpose to understand the innermost regions of CTTSs, deserves a new approach to interpret data and manipulate information. This work addresses the ambition to lay the foundation of a new framework of observational data interpretation that sheds light on the capabilities of new-class interferometric instruments, like the Very Large Telescope Interferometer, in sampling and disentangling the physical conditions in which a star is born.