FAUST
Astronomy and Astrophysics, vol. 686, pp. L13
Abstract
Context. Understanding the connection between outflows, winds, accretion, and discs in the inner protostellar regions is crucial for comprehending star and planet formation processes. Aims. We aim to we explore the inner 300 au of the protostar IRAS 4A2 as part of the ALMA FAUST Large Program. Methods. We analysed the kinematical structures of SiO and CH3OH emission with 50 au resolution. Results. The emission arises from three zones: (i) a very compact and unresolved region (< 50 au) dominated by the ice sublimation zone, at ±1.5 km s−1 with respect to vsys, traced by methanol; (ii) an intermediate region (between 50 au and 150 au) traced by both SiO and CH3OH, between 2 and 6 km s−1 with respect to vsys, with an inverted velocity gradient (with respect to the large-scale emission), whose origin is not clear; (iii) an extended region (> 150 au) traced by SiO, above 7 km s−1 with respect to vsys, and dominated by the outflow. In the intermediate region, we estimated a CH3OH/SiO abundance ratio of about 120–400 and a SiO/H2 abundance of 10−8. We explored various possibilities to explain the origin of this region, such as, a rotating disc or inner envelope, a jet on the plane of the sky or precessing, and a wide-angle disc wind. Conclusions. We propose that CH3OH and SiO in the inner 100 au probe the base of a wide-angle disc wind. The material accelerated in the wind crosses the plane of the sky, giving rise to the observed inverted velocity gradient, and sputtering the grain mantles and cores releasing CH3OH and SiO. This is the first detection of a disc-wind candidate in SiO, and the second ever in CH3OH.
Authors 26
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Centre National de la Recherche Scientifique · European Southern Observatory · Arcetri Astrophysical Observatory · Institut de Planétologie et d'Astrophysique de Grenoble · National Institute for Astrophysics · Université Grenoble Alpes
Affiliation as printed
ESO, Karl Schwarzchild Srt. 2, 85478 Garching bei München, Germany
INAF, Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, 50125 Firenze, Italy
Univ. Grenoble Alpes, CNRS, IPAG, 38000 Grenoble, France
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Arcetri Astrophysical Observatory · National Institute for Astrophysics
Affiliation as printed
INAF, Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, 50125 Firenze, Italy
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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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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, 50125 Firenze, Italy
Univ. Grenoble Alpes, CNRS, IPAG, 38000 Grenoble, France
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National Radio Astronomy Observatory
Affiliation as printed
National Radio Astronomy Observatory, 1003 Lopezville Rd, Socorro, NM 87801, USA
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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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Centre National de la Recherche Scientifique · Institut de Radioastronomie Millimétrique · Institut de Planétologie et d'Astrophysique de Grenoble · Université Grenoble Alpes
Affiliation as printed
Institut de Radioastronomie Millimétrique (IRAM), 300 rue de la Piscine, 38406 Saint-Martin-d’Hères, France
Univ. Grenoble Alpes, CNRS, IPAG, 38000 Grenoble, France
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Universidad Nacional Autónoma de México
Affiliation as printed
Instituto de Astronomía, Universidad Nacional Autónoma de México, Ciudad Universitaria, A.P. 70-264, Cuidad de México 04510, Mexico
Instituto de Radioastronomía y Astrofísica, Universidad Nacional Autónoma de México, A.P. 3-72 (Xangari), 8701 Morelia, Mexico
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National Radio Astronomy Observatory
Affiliation as printed
National Radio Astronomy Observatory, 1003 Lopezville Rd, Socorro, NM 87801, USA
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Affiliation as printed
The Institute of Physical and Chemical Research (RIKEN), 2-1, Hirosawa, Wako-shi, Saitama 351-0198, Japan
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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 Road, Victoria, BC V9E 2E7, Canada
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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
Department of Astronomy, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, 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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Arcetri Astrophysical Observatory · National Institute for Astrophysics
Affiliation as printed
INAF, Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, 50125 Firenze, Italy
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Affiliation as printed
ESO, Karl Schwarzchild Srt. 2, 85478 Garching bei München, Germany
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Centre National de la Recherche Scientifique · Université Toulouse III - Paul Sabatier · Institut de Recherche en Astrophysique et Planétologie · Université de Toulouse
Affiliation as printed
IRAP, Université de Toulouse, CNRS, CNES, UPS, Toulouse, 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
Excellence Cluster ORIGINS, Boltzmannstraße 2, 85748 Garching bei Muünchen, Germany
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Max Planck Institute for Extraterrestrial Physics
Affiliation as printed
Center for Astrochemical Studies, Max-Planck-Institut für extraterrestrische Physik (MPE), Gießenbachstr. 1, 85741 Garching, Germany
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Centre National de la Recherche Scientifique · Université Toulouse III - Paul Sabatier · Institut de Recherche en Astrophysique et Planétologie · Université de Toulouse
Affiliation as printed
IRAP, Université de Toulouse, CNRS, CNES, UPS, Toulouse, France
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Affiliation as printed
Centre for Frontier Science, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan
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Affiliation as printed
Department of Chemistry, University of Virginia, McCormick Road, PO Box 400319 Charlottesville, VA 22904, USA
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Max Planck Institute for Extraterrestrial Physics · The University of Texas at Austin
Affiliation as printed
Center for Astrochemical Studies, Max-Planck-Institut für extraterrestrische Physik (MPE), Gießenbachstr. 1, 85741 Garching, Germany
The University of Texas at Austin, 2515 Speedway, Austin, TS 78712, USA
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Affiliation as printed
The Institute of Physical and Chemical Research (RIKEN), 2-1, Hirosawa, Wako-shi, Saitama 351-0198, Japan
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The Graduate University for Advanced Studies, SOKENDAI
Affiliation as printed
The Graduate University for Advanced Studies (SOKENDAI), Shonan Village, Hayama, Kanagawa 240-0193, Japan
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