Overview
- Ten ARKS papers and a uniform ALMA dataset present high-resolution imaging of 24 debris disks, filling the observational gap between planet-forming disks and mature planetary systems.
- About one-third of the sample shows multiple rings or gaps, ten systems display measurable asymmetries or offsets, and inclined disks reveal diverse vertical thicknesses with a median h_HWHM of ~0.021 that often favors Lorentzian profiles.
- CO gas is confirmed in several young systems, commonly extending farther than the millimetre dust; newly resolved 12CO/13CO ratios and line profiles refine—but do not settle—constraints on gas mass and optical depth.
- HD 121617 exhibits a bright millimetre dust arc and non‑Keplerian gas kinematics; models reproduce the arc via gas‑driven dust trapping with a conservative gas‑mass range of roughly 2.5–250 Earth masses, though planet sculpting remains a viable alternative.
- Comparisons of scattered light and thermal emission show six of fifteen imaged disks peaking farther out in small grains, frequently in gas‑bearing systems, and case studies such as HD 131835 test but do not uniquely confirm gas‑drag versus dual‑belt scenarios.