Papers › Modelling the impact of circumbinary disk accretion on post-AGB binary evolution and...
Modelling the impact of circumbinary disk accretion on post-AGB binary evolution and surface chemistry
Kayla Martin, Orsola De Marco, Devika Kamath, Glenn-Michael Oomen, Hans Van Winckel
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Post-asymptotic giant branch (post-AGB) binaries are surrounded by dusty circumbinary disks, and exhibit unexpected orbital properties resulting from poorly understood binary interaction processes. Re-accreted gas from the circumbinary disk alters the photospheric chemistry of the post-AGB star, producing a characteristic underabundance of refractory elements that correlates with condensation temperature x2013a phenomenon known as chemical depletion. This work investigates how re-accretion from a disk drives chemical depletion, and the impact accreted matter has on post-AGB evolution. We used the MESA code to evolve 0.55 and 0.60 M_⊙ post-AGB stars with the accretion of refractory element-depleted gas from a circumbinary disk. Our study adopts observationally-constrained initial accretion rates and disk masses to reproduce the chemical depletion patterns of six well-studied post-AGB binary stars: EP Lyr, HP Lyr, IRAS 17038-4815, IRAS 09144-4933, HD 131356, and SX Cen. We find high accretion rates ($>\,$10$^{-7}$ M_⊙yr⁻¹) and large disk masses (≥10⁻² M_⊙) necessary to reproduce observed depletion, particularly in higher-mass, hotter post-AGB stars (T_(eff)≥ 6000 K). A slower evolution (lower core mass) is required to reproduce cooler (T_(eff)≤ 5000 K) depleted post-AGB stars. Rapid accretion significantly impacts post-AGB evolution, stalling stars at cooler effective temperatures and extending post-AGB lifetimes by factors of around 3 to 10. Despite this, extended post-AGB timescales remain within or below the planetary nebula (PN) visibility timescale, suggesting accretion cannot account for the observed lack of ionised PNe in post-AGB binaries. Our findings constrain accretion-flow parameters and advance our understanding of disk-binary interactions in post-AGB systems.
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