ALMA Observations of the HD 110058 Debris Disk

Abstract We present Atacama Large Millimeter/submillimeter Array (ALMA) observations of the young, gas-rich debris disk around HD 110058 at 0.″3–0.″6 resolution. The is detected in 0.85 and 1.3 mm continuum, as well J = 2–1 3–2 transitions 12 CO 13 CO. resolve dust gas distributions reveal that this smallest stars similar luminosity observed by ALMA. new ALMA data confirm very close to edge-on, shown previously scattered-light images. use radiative transfer modeling constrain physical properties disks. density peaks 31 au has a smooth outer edge extends out ∼70 au. Interestingly, emission marginally resolved along minor axis, which indicates it vertically thick if truly edge-on with an aspect ratio between 0.13 0.28. also find distribution more compact than (similar 49 Ceti), could be due low viscosity higher release rate small radii. Using simulations evolution taking into account photodissociation, shielding, viscous evolution, we 110058's mass are consistent secondary origin scenario. Finally, densities may high enough cause outward drift grains disk.