Molecules with ALMA at Planet-forming Scales (MAPS). XIV. Revealing disk substructures in multiwavelength continuum emission

Anibal Sierra, Laura M. Pérez, Ke Zhang, Charles J. Law, Viviana V. Guzmán, Chunhua Qi, Arthur D. Bosman, Karin I. Öberg, Sean M. Andrews, Feng Long, Richard Teague, Alice S. Booth, Catherine Walsh, David J. Wilner, François Ménard, Gianni Cataldi, Ian Czekala, Jaehan Bae, Jane Huang, Jennifer B. BergnerJohn D. Ilee, Myriam Benisty, Romane Le Gal, Ryan A. Loomis, Takashi Tsukagoshi, Yao Liu, Yoshihide Yamato, Yuri Aikawa

Research output: Contribution to journalArticlepeer-review

58 Citations (Scopus)


Constraining dust properties of planet-forming disks via high-angular-resolution observations is fundamental to understanding how solids are trapped in substructures and how dust growth may be favored or accelerated therein. We use ALMA dust continuum observations of the Molecules with ALMA at Planet-forming Scales (MAPS) disks and explore a large parameter space to constrain the radial distribution of solid mass and maximum grain size in each disk, including or excluding dust scattering. In the nonscattering model, the dust surface density and maximum grain size profiles decrease from the inner disks to the outer disks, with local maxima at the bright ring locations, as expected from dust trapping models. The inferred maximum grain sizes from the inner to outer disks decrease from 1 cm to 1 mm. For IM Lup, HD 163296, and MWC 480 in the scattering model, two solutions are compatible with their observed inner disk emission: one solution corresponding to a maximum grain size of a few millimeters (similar to the nonscattering model), and the other corresponding to a size of a few hundred micrometers. Based on the estimated Toomre parameter, only IM Lup-which shows a prominent spiral morphology in millimeter dust-is found to be gravitationally unstable. The estimated maximum Stokes number in all the disks lies between 0.01 and 0.3, and the estimated turbulence parameters in the rings of AS 209 and HD 163296 are close to the threshold where dust growth is limited by turbulent fragmentation. This paper is part of the MAPS special issue of the Astrophysical Journal Supplement.
Original languageEnglish
Article number14
JournalAstrophysical Journal Supplement Series
Issue number1
Early online date3 Nov 2021
Publication statusPublished - Nov 2021


  • Circumstellar dust
  • Interstellar scattering
  • Radiative transfer
  • Radio continuum emission
  • Protoplanetary disks


Dive into the research topics of 'Molecules with ALMA at Planet-forming Scales (MAPS). XIV. Revealing disk substructures in multiwavelength continuum emission'. Together they form a unique fingerprint.

Cite this