exoALMA III: Line-intensity Modeling and System Property Extraction from Protoplanetary Disks

Abstract

The ALMA large program exoALMA offers a unique window into the three-dimensional physical and dynamical properties of 15 circumstellar disks where planets may be actively forming. Here, we present an analysis methodology to map the gas disk structure and substructure encoded in 12CO, 13CO, and CS line emission from our targets. To model and characterize the disk structure probed by optically thin species, such as CS and, in some cases, 13CO, we introduce a composite line profile kernel that accounts for increased intensities caused by the projected overlap between the disk's front and back side emission. Our workflow, built on the Discminer modelling framework, incorporates an improved iterative two-component fitting method for inclined sources ($i>40^{\circ }$), to mitigate the impact of the disk backside on the extraction of velocity maps. Also, we report best-fit parameters for the Keplerian stellar masses, as well as inclinations, position angles, systemic velocities, rotation direction, and emission surfaces of the disks in our sample.

This paper is part of the exoALMA Focus Issue of The Astrophysical Journal Letters

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• exoALMA V: Gaseous Emission Surfaces and Temperature Structures
• exoALMA XII: Weighing and sizing exoALMA disks with rotation curve modelling
• exoALMA IV: Substructures, Asymmetries, and the Faint Outer Disk in Continuum Emission
• exoALMA. VI. Rotating under Pressure: Rotation curves, azimuthal velocity substructures, and pressure variations
• exoALMA XV: Interpreting the height of CO emission layer
• exoALMA. XVII. Characterizing the Gas Dynamics around Dust Asymmetries
• exoALMA. VIII. Probabilistic Moment Maps and Data Products using Non-parametric Linear Models
• Circumplanetary Disk Candidate in the Disk of HD 163296 Traced by Localized Emission from Simple Organics
• The ALMA survey to Resolve exoKuiper belt Substructures (ARKS) VII: Optically thick gas with broad CO gaussian local line profiles in the HD 121617 disc
• exoALMA XXI: The Morphology and Dynamics of Vertical Flows
• exoALMA XIX: Confirmation of Non-thermal Line Broadening in the DM Tau Protoplanetary Disk
• exoALMA XXIII. Estimating Disk and Planet Properties from Dust Morphologies with DBNets2.0
• exoALMA XX: Tomographic Detection of Embedded Planets in Protoplanetary Disks