FAUST
Astronomy and Astrophysics, vol. 698, pp. L16
Abstract
Context. Planet formation around young stars requires the growth of interstellar dust grains from micron-sized (μm-sized) particles to kilometre-sized (km-sized) planetesimals. Numerical simulations have shown that large (mm-sized) grains found in the inner envelope of young protostars could be lifted from the disc via winds. However, we are still lacking unambiguous evidence for large grains in protostellar winds and outflows. Aims. We investigated dust continuum emission in the envelope of the Class I binary L1551 IRS5 in the Taurus molecular cloud, aiming to identify observational signatures of grain growth, such as variations in the dust emissivity index (βmm). Methods. In this context, we present new, high-angular resolution (50 au) observations of thermal dust continuum emission at 1.3 mm and 3 mm in the envelope (∼3000 au) of L1551 IRS5, obtained as part of the ALMA-FAUST Large Program. Results. We analysed dust emission along the cavity walls of the CO outflow, extended up to ∼1800 au. We found an H2 volume density > 2 × 105 cm−3, a dust mass of ∼58 M⊕, and βmm ≲ 1, implying the presence of grains ∼103 times larger than typical sizes for the interstellar medium (ISM). Conclusions. We present the first spatially resolved observational evidence of large grains within an outflow cavity wall. Our results suggest that these grains have been transported from the inner disc to the envelope by protostellar winds and may subsequently fall back into the outer disc by gravity and/or via accretion streamers. This cycle provides longer time for grains to grow, demonstrating their crucial role in the formation of planetesimals.
Authors 22
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Arcetri Astrophysical Observatory · National Institute for Astrophysics
Affiliation as printed
INAF, Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, I-50125 Firenze, Italy
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Arcetri Astrophysical Observatory · National Institute for Astrophysics
Affiliation as printed
INAF, Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, I-50125 Firenze, Italy
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National Radio Astronomy Observatory
Affiliation as printed
National Radio Astronomy Observatory, PO Box O Socorro, NM 87801, USA
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Affiliation as printed
European Southern Observatory, Alonso de Cordova 3107, Vitacura, Region Metropolitana de Santiago, Chile
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Arcetri Astrophysical Observatory · National Institute for Astrophysics
Affiliation as printed
INAF, Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, I-50125 Firenze, Italy
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Max Planck Institute for Extraterrestrial Physics
Affiliation as printed
Center for Astrochemical Studies, Max-Planck-Institut für Extraterrestrische Physik, Gießenbachstr. 1, 85748 Garching, Germany
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Centre National de la Recherche Scientifique · Arcetri Astrophysical Observatory · Institut de Planétologie et d'Astrophysique de Grenoble · National Institute for Astrophysics · Université Grenoble Alpes
Affiliation as printed
INAF, Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, I-50125 Firenze, Italy
Univ. Grenoble Alpes, CNRS, IPAG, 38000 Grenoble, France
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Centre National de la Recherche Scientifique · Institut de Planétologie et d'Astrophysique de Grenoble · Université Grenoble Alpes
Affiliation as printed
Univ. Grenoble Alpes, CNRS, IPAG, 38000 Grenoble, France
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Affiliation as printed
RIKEN Cluster for Pioneering Research, 2-1, Hirosawa, Wako-shi, Saitama 351-0198, Japan
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Affiliation as printed
Dipartimento di Fisica e Astronomia “Augusto Righi”, Viale Berti Pichat 6/2, Bologna, Italy
Dipartimento di Fisica e Astronomia "Augusto Righi", Viale Berti Pichat 6/2, Bologna, Italy
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Affiliation as printed
European Southern Observatory, Karl-Schwarzschild-Strasse 2, D-85748 Garching bei München, Germany
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National Radio Astronomy Observatory
Affiliation as printed
National Radio Astronomy Observatory, PO Box O Socorro, NM 87801, USA
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University of Electro-Communications
Affiliation as printed
Graduate School of Informatics and Engineering, The University of Electro-Communications, Chofu, Tokyo 182-8585, Japan
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Leiden University · Leiden Observatory
Affiliation as printed
Leiden Observatory, Leiden University, PO Box 9513 2300 RA Leiden, The Netherlands
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Max Planck Institute for Extraterrestrial Physics
Affiliation as printed
Center for Astrochemical Studies, Max-Planck-Institut für Extraterrestrische Physik, Gießenbachstr. 1, 85748 Garching, Germany
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Centre National de la Recherche Scientifique · Institut de Planétologie et d'Astrophysique de Grenoble · Université Grenoble Alpes
Affiliation as printed
Univ. Grenoble Alpes, CNRS, IPAG, 38000 Grenoble, France
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European Southern Observatory · Arcetri Astrophysical Observatory · National Institute for Astrophysics
Affiliation as printed
European Southern Observatory, Karl-Schwarzschild-Strasse 2, D-85748 Garching bei München, Germany
INAF, Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, I-50125 Firenze, Italy
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Affiliation as printed
Centro de Astrobiología (CSIC-INTA), Ctra. de Torrejón a Ajalvir, km 4, 28850 Torrejón de Ardoz, Spain
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Herzberg Institute of Astrophysics · University of Victoria
Affiliation as printed
Department of Physics and Astronomy, University of Victoria, Victoria, BC V8P 5C2, Canada
NRC Herzberg Astronomy and Astrophysics, 5071 West Saanich Rd, Victoria, BC V9E 2E7, Canada
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Harvard University · Universidad Nacional Autónoma de México
Affiliation as printed
Black Hole Initiative at Harvard University, 20 Garden Street, Cambridge, MA 02138, USA
David Rockefeller Center for Latin American Studies, Harvard University, 1730 Cambridge Street, Cambridge, MA 02138, USA
Instituto de Radioastronomía y Astrofísica, UNAM, Apartado Postal 3-72, Morelia, 58090 Michoacán, Mexico
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Affiliation as printed
Star and Planet Formation Laboratory, RIKEN Cluster for Pioneering Research, Wako, Saitama 351-0198, Japan
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The Graduate University for Advanced Studies, SOKENDAI
Affiliation as printed
SOKENDAI (The Graduate University for Advanced Studies), Shonan Village, Hayama, Kanagawa 240-0193, Japan
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