FAUST

Young binary stars with discs provide unique laboratories for studying the earliest stages of planet formation in star-forming environments. The detection of substructure in discs around Class I protostars challenges current models of disc evolution, and suggests that planets may form earlier than previously expected (< 1 Myr). In the context of the FAUST Large Program, we present observations of the circumbinary disc (CBD) around the young binary system L1551 IRS 5. The CBD exhibits two prominent over-densities in the continuum emission at the edge of the cavity, with the northern over-density being about 20% brighter than the southern one. By analysing the disc morphology and kinematics of L1551 IRS 5, we delineate dynamical constraints on the binary’s orbital parameters. Additionally, we present 3D hydrodynamical models of the CBD to predict both the dust and the gas surface densities. Then, we compare the resulting synthetic observations with ALMA observations of the continuum emission at 1.3 mm and the C 18 O line emission. Our analysis suggests that the density enhancements observed with ALMA in L1551 IRS 5 can be caused by interactions between the binary stars and the CBD, leading to dust concentration within the disc. We conclude that the observed over-density corresponds to a location where solids could potentially grow in size under favourable conditions.

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Publication Details

Journal
Astronomy and Astrophysics
Published
2025-12-22
DOI
https://doi.org/10.1051/0004-6361/202554082
Primary Topic
Astrophysics and Star Formation Studies
Type
article
Field-Weighted Citation Impact
0.00

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article

FAUST

Layal Chahine, Laurent Loinard, F. Ménard, L. Podio et al.
Astronomy and Astrophysics
Astrophysics and Star Formation Studies
article

FAUST

Layal Chahine, Laurent Loinard, F. Ménard, L. Podio, G. Sabatini, Satoshi Yamamoto, Doug Johnstone, Nicolás Cuello, D. Fedele, María José Maureira, Nami Sakai, Aurora Durán, Tomoyuki Hanawa, M. De Simone, C. Codella, Izaskun Jiménez-Serra, E. Bianchi, C. Ceccarelli, Claire J. Chandler, Ricardo Hernández Garnica
article en

Abstract

Young binary stars with discs provide unique laboratories for studying the earliest stages of planet formation in star-forming environments. The detection of substructure in discs around Class I protostars challenges current models of disc evolution, and suggests that planets may form earlier than previously expected (< 1 Myr). In the context of the FAUST Large Program, we present observations of the circumbinary disc (CBD) around the young binary system L1551 IRS 5. The CBD exhibits two prominent over-densities in the continuum emission at the edge of the cavity, with the northern over-density being about 20% brighter than the southern one. By analysing the disc morphology and kinematics of L1551 IRS 5, we delineate dynamical constraints on the binary’s orbital parameters. Additionally, we present 3D hydrodynamical models of the CBD to predict both the dust and the gas surface densities. Then, we compare the resulting synthetic observations with ALMA observations of the continuum emission at 1.3 mm and the C 18 O line emission. Our analysis suggests that the density enhancements observed with ALMA in L1551 IRS 5 can be caused by interactions between the binary stars and the CBD, leading to dust concentration within the disc. We conclude that the observed over-density corresponds to a location where solids could potentially grow in size under favourable conditions.

Astronomy and AstrophysicsVol. 705
Herzberg Institute of Astrophysics (CA), Centre National de la Recherche Scientifique (FR), Pioneer (United States) (US), Chiba University (JP), The Graduate University for Advanced Studies, SOKENDAI (JP), University of Victoria (CA), National Radio Astronomy Observatory (US), Arcetri Astrophysical Observatory (IT), Max Planck Institute for Extraterrestrial Physics (DE), Excellence Cluster Origins (DE), Centro de Astrobiología (ES), Universidad Nacional Autónoma de México (MX), Université Grenoble Alpes (FR)
National Science Foundation, National Aeronautics and Space Administration, Ministerio de Ciencia, Innovación y Universidades, National Radio Astronomy Observatory, European Commission, Deutsche Forschungsgemeinschaft, National Science Council, National Astronomical Observatory of Japan, HORIZON EUROPE Framework Programme, Dirección General de Asuntos del Personal Académico, Universidad Nacional Autónoma de México, National Institutes of Natural Sciences, European Regional Development Fund, Agencia Estatal de Investigación, Astrophysics Division
Openalex Percentile: Top 72%
Astrophysics and Star Formation Studies
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