ACES Partial tidal disruption events: exilic of youth - Megha Sharma (Monash)

It has been estimated that about 104-105 stars have survived tidal disruption events (TDEs)
in our Galactic Center, resulting in partial tidal disruption events. These events occur when a
supermassive black hole (SMBH) interacts tidally with a star, giving rise to surviving remnants.
Employing the 1D stellar evolution code Kepler and the 3D smoothed particle hydrodynamics
code Phantom, we investigate the tidal disruption of 1, 3, and 10 M⊙ models at zero-age
(ZAMS), middle-age (MAMS) and terminal-age main-sequence (TAMS). We mapped the remnants
formed into Kepler to understand post disruption evolution. Our findings reveal distinct
characteristics in the remnants, including increased radius, accelerated rotation in the central
region, and differential rotation in the outer layers. They undergo composition mixing which
affects their stellar evolution. We also find that circumstellar envelopes can form around the
remnant. Remnant formed from disruption of ZAMS models evolve similarly to Kepler models
of same mass. But for remnants of MAMS and TAMS models, the remnants have higher effective
luminosity and temperature. We discuss potential observational signatures, particularly
focusing on nitrogen and carbon abundances post Kelvin-Helmholtz time, providing insights into
the unique evolutionary paths of remnants from various stellar models.