FAUST
Astronomy and Astrophysics, vol. 699, pp. A382
Abstract
Context. During the early stages of star formation, accretion processes such as infall from the envelope and molecular streamers and ejection of matter through winds and jets take place simultaneously and distribute the angular momentum of the parent molecular cloud. The Class 0/I binary [BHB2007] 11 shows evidence for accretion and ejection at the scales of the circumbinary disk and the inner close binary. Recent observations of H2CO, however, have shown two elongated structures with indications of outflowing motion almost perpendicular to the main CO outflow, which is launched from the circumbinary disk. Aims. We study the kinematics of the molecular gas at intermediate scales of ~50–3000 au around [BHB2007] 11 to verify the nature of these elongated structures. Methods. We analyzed the line emission of H13CO+, CCH, c-C3H2, and SiO observed with the Atacama Large Millimeter/submillimeter Array (ALMA) within the large program called Fifty AU STudy of the chemistry in the disc/envelope system of Solar-like protostars (FAUST). These molecules trace the material that moves at velocities close to that of the ambient cloud, which could not be probed in previous observations of the self-absorbed emission of CO. Results. The images of H13CO+, CCH, and c-C3H2 show clear elongated structures similar to those previously detected in H2CO, whose gas kinematics are consistent with outflowing motions and with rotation in the opposite sense to the main CO outflow. The derived mass-loss rate from these large-scale structures is (1.7 ± 0.5) × 10−6 M⊙ yr−1, which agrees with the rates measured in outflows driven by Class 0/I protostars. The SiO image reveals compact emission close to the binary system, with a slight elongation that is aligned with the larger-scale structures. This suggests that SiO is released from the sputtering of dust grains in the shocked material at the base of the potential new outflow, with a relative abundance of ≥(0.11–2.0) × 10−9. However, higher angular and spectral resolution observations are needed to accurately estimate the outflow-launching radius and its powering source. Based on the location and the abundance of the SiO emission, we propose that the second outflow may be launched from inside the circumbinary disk, likely by the less massive companion that actively accretes material from its surroundings.
Authors 29
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Centro de Astrobiología · Universidad Autónoma de Madrid
Affiliation as printed
Centro de Astrobiología (CAB), INTA-CSIC, Carretera de Ajalvir km 4, Torrejón de Ardoz, 28850, Madrid, Spain
Escuela de Doctorado, Universidad Autónoma de Madrid, 28049 Cantoblanco, Madrid, Spain
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Affiliation as printed
Centro de Astrobiología (CAB), INTA-CSIC, Carretera de Ajalvir km 4, Torrejón de Ardoz, 28850, Madrid, Spain
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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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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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Affiliation as printed
School of Physics and Astronomy, University of Leeds, Leeds LS2 9JT, UK
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Max Planck Institute for Extraterrestrial Physics
Affiliation as printed
Center for Astrochemical Studies, Max-Planck-Institut für Extraterrestrische Physik, Gießenbachstraße 1, 85748 Garching, Germany
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Max Planck Institute for Extraterrestrial Physics
Affiliation as printed
Center for Astrochemical Studies, Max-Planck-Institut für Extraterrestrische Physik, Gießenbachstraße 1, 85748 Garching, Germany
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Arcetri Astrophysical Observatory
Affiliation as printed
INAF – Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, 50125, Florence, 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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Arcetri Astrophysical Observatory
Affiliation as printed
INAF – Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, 50125, Florence, Italy
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Affiliation as printed
European Southern Observatory, Karl-Schwarzschild-Strasse 2 85748 Garching bei Munchen, Germany
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Arcetri Astrophysical Observatory
Affiliation as printed
INAF – Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, 50125, Florence, Italy
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Arcetri Astrophysical Observatory
Affiliation as printed
INAF – Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, 50125, Florence, Italy
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Affiliation as printed
Department of Astronomy, The University of Tokyo, 7-3-1 Hongo, Bunkyoku, Tokyo 113-0033, Japan
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Ausonius Institut de Recherche sur l'Antiquité et le Moyen age
Affiliation as printed
IRAM, 300 rue de la Piscine, 38406 Saint-Martin d'Hères, France
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Leiden University · Leiden Observatory
Affiliation as printed
Leiden Observatory, Leiden University, PO Box 9513, 23000 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, Gießenbachstraße 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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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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Arcetri Astrophysical Observatory
Affiliation as printed
INAF – Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, 50125, Florence, Italy
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Affiliation as printed
Center for Frontier Science, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, 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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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, Universidad Nacional Autonóma de México, Apartado Postal 3-72, Morelia 58090 Michoacán, Mexico
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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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National Astronomical Observatory of Japan
Affiliation as printed
National Astronomical Observatory of Japan, Osawa 2-21-1, Mitaka-shi, Tokyo 181-8588, Japan
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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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Max Planck Institute for Extraterrestrial Physics
Affiliation as printed
Center for Astrochemical Studies, Max-Planck-Institut für Extraterrestrische Physik, Gießenbachstraße 1, 85748 Garching, 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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The Graduate University for Advanced Studies, SOKENDAI
Affiliation as printed
SOKENDAI, Shonan Village, Hayama, Kanagawa 240-0193, Japan
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