Leaky dust trap in the PDS 70 disk revealed by ALMA Band 9 observations
Anibal Sierra, Myriam Benisty, Paola Pinilla, Laura P\'erez, Pietro Curone, Kiyoaki Doi, Stefano Facchini, Daniele Fasano, Sean Andrews, Jaehan Bae, John Carpenter, Ian Czekala, Andrea Isella, Nicolas Kurtovic, Francois Menard, Richard Teague

TL;DR
This study uses ALMA Band 9 observations to reveal a dust ring in PDS 70, showing small grains escaping the pressure bump and supporting models of dust filtering and pebble flux in planet-forming disks.
Contribution
First high-resolution Band 9 ALMA observations of PDS 70 revealing detailed dust distribution and validating dust evolution models in protoplanetary disks.
Findings
Detection of a ring-like dust morphology with a peak between infrared and longer wavelength observations.
Evidence of small grains escaping the pressure bump, indicating complex dust dynamics.
Confirmation of pebble flux through the disc gap consistent with theoretical models.
Abstract
We present new observations of the PDS 70 disc obtained with the Atacama Large Millimeter/sub-millimeter Array (ALMA) in Band 9 (671 GHz) at 0.242 resolution, which provide valuable insights into the spatial distribution of sub-millimetre grains in the disc. The data reveal a ring-like morphology, with a radial peak located between those previously observed at infrared wavelengths and longer millimetre observations. Additionally, we detect a tentative outer shoulder in Band 9 that is not observed at longer wavelengths. These findings suggest that small grains (m) traced by Band 9 may be escaping from the pressure bump both radially inwards and outwards, or may be tracing different disc layers than those probed at longer wavelengths. A multi-wavelength analysis of the disc at millimetre wavelengths and the best fit to the spectral energy distribution shows…
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Taxonomy
TopicsAstrophysics and Star Formation Studies · Astronomy and Astrophysical Research · Stellar, planetary, and galactic studies
