Description
Edge-on disks provide a unique opportunity to probe the vertical structure and solid-state composition of protoplanetary environments. Recent JWST observations of the binary disk HH 48 have demonstrated that 3D radiative transfer models incorporating full anisotropic scattering are essential for accurately retrieving ice abundances (Sturm et al. 2023b, 2024; Bergner et al. 2024). In HH 48 NE, mid-infrared scattered-light observations revealed that optical depth measurements can underestimate the true ice abundance by up to an order of magnitude, and they suggested that turbulent lofting of ice grains plays a key role in establishing the vertical distribution of species such as CO ice (Sturm et al. 2023c).
Here, we apply a full anisotropic scattering radiative transfer model (Pontoppidan et al. 2007, Sturm et al. 2023a,b) to the edge-on disk ESO-Hα 569 to retrieve the spatial distribution and absolute abundances of ices. We fit this model to new JWST NIRSpec IFU and MIRI MRS observations from the MIDAS program (PI McClure), covering the absorption features of major ice species as well as the optical, infrared, and sub-millimeter continuum. In contrast to HH 48 NE, ESO-Hα 569 is relatively isolated (Wolff et al. 2017), which excludes potential external stirring effects from a binary partner. Our preliminary results suggest that the upper layers of ESO-Hα 569 contain less ice compared to HH 48 NE, a discrepancy that may indicate enhanced depletion of solids through dust settling to the midplane or reduced turbulent circulation.
| Talk category | NOVA Network 2 |
|---|---|
| Preference for a talk or poster | Poster |
