A faint dust ring beyond the compact disk of Sz 76
10 affiliations
- 1European Southern Observatory
- 2Instituto de Astronomía, Universidad Nacional Autónoma de México
- 3Dipartimento di Fisica, Università degli Studi di Milano
- 4Konkoly Observatory, HUN-REN Research Centre for Astronomy and Earth Sciences, MTA Centre of Excellence
- 5INAF – Osservatorio Astronomico di Capodimonte
- 6Thüringer Landessternwarte
- 7Department of Astronomy, Boston University
- 8Institute for Astronomy, University of Hawai’i at Mãnoa
- 9Instituto de Física y Astronomía, Universidad de Valparaíso
- 10Chinese Academy of Sciences South America Center for Astronomy (CASSACA), National Astronomical Observatories, CAS
Abstract
We report new ALMA Band 7 high-resolution (∼0.05″) continuum and ¹² CO ( J = 3–2) observations of the disk around the young low-mass star Sz 76. Visibility plane modeling have revealed 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, setting 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.
Related
- HD 152384: A 5-megayear-old debris disk system showing a gaseous ring of refractory elements at the dust sublimation radius
- A Warped Dust Ring in the CQ Tau Disk
- HD 152384: A 5 Myr old debris disk system showing a gaseous ring of refractory elements at the dust sublimation radius
- Outer pressure bumps beyond the dust disc: Missing Outer Rings in the exoALMA Sample: Physical Mechanisms Suppressing Dust Ring Formation Despite Strong Pressure Bumps
- VLTI/MATISSE observations of the hot dust around β Pictoris Observing faint objects with MATISSE
BibTeX
@article{ricciardi2026faint,
title = {{A faint dust ring beyond the compact disk of Sz 76}},
author = {G. Ricciardi and A. Miotello and K. Mauco and C. F. Manara and S. Facchini and Á. Kóspál and J. Alcalá and J. Eislöffel and C. C. Espaillat and M. Vioque and J. P. Williams and Z. Guo},
journal = {Astronomy \& Astrophysics},
year = {2026},
month = oct,
doi = {10.1051/0004-6361/202662655},
url = {https://www.aanda.org/10.1051/0004-6361/202662655},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - A faint dust ring beyond the compact disk of Sz 76
AU - G. Ricciardi
AU - A. Miotello
AU - K. Mauco
AU - C. F. Manara
AU - S. Facchini
AU - Á. Kóspál
AU - J. Alcalá
AU - J. Eislöffel
AU - C. C. Espaillat
AU - M. Vioque
AU - J. P. Williams
AU - Z. Guo
PY - 2026
DA - 2026/10/20
JO - Astronomy & Astrophysics
DO - 10.1051/0004-6361/202662655
UR - https://www.aanda.org/10.1051/0004-6361/202662655
AB - We report new ALMA Band 7 high-resolution (∼0.05″) continuum and ¹² CO ( J = 3–2) observations of the disk around the young low-mass star Sz 76. Visibility plane modeling have revealed 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, setting 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.
SN - 0004-6361
SN - 1432-0746
ER -