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PreprintCC BY 4.0arXiv

A faint dust ring beyond the compact disk of Sz 76

  • Giulia Ricciardi
  • Anna Miotello
  • Karina Mauco
  • Carlo F. Manara
  • Stefano Facchini
  • Agnes Kóspál
  • Juan M. Alcalá
  • Jochen Eislöeffel
  • Catherine C. Espaillat
  • Miguel Vioque
  • Jonathan P. Williams
  • Zhen Guo
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Abstract

We report new ALMA Band 7 high-resolution (∼0.05'') continuum and 12CO (J=3−−2) observations of the disk around the young low-mass star Sz 76. Visibility-plane modeling reveals a previously undetected, faint outer dust ring centered at ∼45 au surrounding the compact central disk. Including this low-surface-brightness feature increases the characteristic dust radius from Rdust,68 ≈ 7 au to $41$ au. Combined with an outer gas extent of RCO,68 ≈ 77 au, the resulting gas-to-dust size ratio decreases from an extreme value of ∼11 to ∼2, placing Sz 76 in line with typical protoplanetary disks and contradicting a scenario of unimpeded inward radial drift. These results demonstrate that spatial filtering or limited surface-brightness sensitivity can severely underestimate disk sizes, highlighting the necessity of multi-scale observations to properly identify dust traps and accurately constrain disk evolution.

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Cite

BibTeXRIS
BibTeX
@misc{ricciardi2026faint,
  title = {{A faint dust ring beyond the compact disk of Sz 76}},
  author = {Giulia Ricciardi and Anna Miotello and Karina Mauco and Carlo F. Manara and Stefano Facchini and Agnes Kóspál and Juan M. Alcalá and Jochen Eislöeffel and Catherine C. Espaillat and Miguel Vioque and Jonathan P. Williams and Zhen Guo},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.09881},
  eprint = {2610.09881},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.09881},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - A faint dust ring beyond the compact disk of Sz 76
AU  - Giulia Ricciardi
AU  - Anna Miotello
AU  - Karina Mauco
AU  - Carlo F. Manara
AU  - Stefano Facchini
AU  - Agnes Kóspál
AU  - Juan M. Alcalá
AU  - Jochen Eislöeffel
AU  - Catherine C. Espaillat
AU  - Miguel Vioque
AU  - Jonathan P. Williams
AU  - Zhen Guo
PY  - 2026
DA  - 2026/10/20
PB  - arXiv
DO  - 10.48550/arxiv.2610.09881
UR  - https://arxiv.org/abs/2610.09881
AB  - We report new ALMA Band 7 high-resolution (∼0.05^'') continuum and ^12CO (J=3−−2) observations of the disk around the young low-mass star Sz 76. Visibility-plane modeling reveals a previously undetected, faint outer dust ring centered at ∼45 au surrounding the compact central disk. Including this low-surface-brightness feature increases the characteristic dust radius from R_dust,68 ≈ 7 au to $41$ au. Combined with an outer gas extent of R_CO,68 ≈ 77 au, the resulting gas-to-dust size ratio decreases from an extreme value of ∼11 to ∼2, placing Sz 76 in line with typical protoplanetary disks and contradicting a scenario of unimpeded inward radial drift. These results demonstrate that spatial filtering or limited surface-brightness sensitivity can severely underestimate disk sizes, highlighting the necessity of multi-scale observations to properly identify dust traps and accurately constrain disk evolution.
ER  -