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2025ApJ...984L..15P - Astrophys. J., 984, L15 (2025/May-1)

exoALMA. X. Channel Maps Reveal Complex 12CO Abundance Distributions and a Variety of Kinematic Structures with Evidence for Embedded Planets.

PINTE C., ILEE J.D., HUANG J., BENISTY M., FACCHINI S., FUKAGAWA M., TEAGUE R., BAE J., BARRAZA-ALFARO M., CATALDI G., CUELLO N., CURONE P., CZEKALA I., FASANO D., FLOCK M., GALLOWAY-SPRIETSMA M., GARG H., HALL C., HAMMOND I., HARDIMAN C., HILDER T., IZQUIERDO A.F., KANAGAWA K., LESUR G., LODATO G., LONGARINI C., LOOMIS R.A., MASSET F., MENARD F., ORIHARA R., PRICE D.J., ROSOTTI G., STADLER J., YEN H.-W., WAFFLARD-FERNANDEZ G., WILNER D.J., WINTER A.J., WOLFER L., YOSHIDA T.C. and ZAWADZKI B.

Abstract (from CDS):

We analyze the 12CO J = 3-2 data cubes of the disks in the exoALMA program. 13/15 disks reveal a variety of kinematic substructures in individual channels: large-scale arcs or spiral arms, localized velocity kinks, and/or multiple faints arcs that appear like filamentary structures on the disk surface. We find kinematic signatures that are consistent with planet wakes in six disks: AA Tau, SY Cha, J1842, J1615, LkCa 15, and HD 143006. Comparison with hydrodynamical and radiative transfer simulations suggests planets with orbital radii between 80 and 310 au and masses between 1 and 5 MJup. Additional kinematic substructures limit our ability to place tight constraints on the planet masses. When the inclination is favorable to separate the upper and lower surfaces (near 45°, i.e., in 7/15 disks), we always detect the vertical CO snowline and find that the 12CO freeze-out is partial in the disk midplane, with a depletion factor of ≈10–3 -10–2 compared to the warm molecular layer. In these same seven disks, we also systematically detect evidence of CO desorption in the outer regions.

Abstract Copyright: © 2025. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Protoplanetary disks - Exoplanet formation - Radiative transfer - Hydrodynamics - Planetary-disk interactions - Exoplanets - Submillimeter astronomy

Simbad objects: 22

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