Mapping the Vertical Gas Structure of the Planet-hosting PDS 70 Disk
Charles J. Law, Myriam Benisty, Stefano Facchini, Richard Teague,, Jaehan Bae, Andrea Isella, Inga Kamp, Karin I. \"Oberg, Bayron, Portilla-Revelo, Luna Rampinelli

TL;DR
This study maps the 2D vertical gas structure of the PDS 70 protoplanetary disk using high-resolution CO isotopologue and HCO$^+$ observations, revealing the disk's layered structure and implications for planet formation.
Contribution
It provides the first detailed vertical gas structure map of PDS 70, including the emission surfaces of multiple molecules and the temperature profile, enhancing understanding of disk morphology and planet formation.
Findings
$^{12}$CO traces a height of $z/r\approx0.3$
HCO$^+$ surface at $z/r\approx0.2$
Midplane CO snowline at 56-85 au
Abstract
PDS 70 hosts two massive, still-accreting planets and the inclined orientation of its protoplanetary disk presents a unique opportunity to directly probe the vertical gas structure of a planet-hosting disk. Here, we use high-spatial-resolution (0."1;10 au) observations in a set of CO isotopologue lines and HCO J=4-3 to map the full 2D disk structure from the disk atmosphere, as traced by CO, to closer to the midplane, as probed by less abundant isotopologues and HCO. In the PDS 70 disk, CO traces a height of , CO is found at , and CO originates at, or near, the midplane. The HCO surface arises from and is one of the few non-CO emission surfaces constrained with high fidelity in disks to date. In the CO J=3-2 line, we resolve a vertical dip and steep rise in height at the…
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Taxonomy
TopicsMolecular Spectroscopy and Structure · Phase Equilibria and Thermodynamics · Atmospheric Ozone and Climate
