FAUST
Astronomy and Astrophysics, vol. 678, pp. A160
Abstract
Context. Deuterium in H-bearing species is enhanced during the early stages of star formation. However, only a small number of high-spatial-resolution deuteration studies exist towards protostellar objects, leaving the small-scale structures of these objects unrevealed and understudied. Aims. We aim to constrain the deuterium fractionation ratios in a Class 0/I protostellar object in formaldehyde (H2CO), which has abundant deuterated isotopologues in this environment. Methods. We used the Atacama Large Millimeter Array (ALMA) within the context of the Large Program Fifty AU STudy of the chemistry in the disk/envelope system of Solar-like protostars (FAUST) to observe the Class 0/I protobinary system [BHB2007] 11, whose emission components are embedded in circumstellar disks that have radii of 2 to 3 au. The system is surrounded by a complex filamentary structure (the so-called streamers) connected to the larger circumbinary disk. In this work, we present the first study of formaldehyde D-fractionation towards this source with detections of H2CO 3(0,3)–2(0,2), combined with HDCO 4(2,2)–3(2,1), HDCO 4(1,4)–3(1,3) and D2CO 4(0,4)–3(0,3). These observations probe the structures of the protobinary system, enabling us to resolve multiple velocity components associated with the methanol hot spots also uncovered by FAUST data, as well as the colder external envelope. In addition, based on the kinematics seen in our observations of the H2CO emission, we propose the presence of a second large-scale outflow. Results. The results derived from our ALMA observations agree with the current literature in that we only find the deuterated species HDCO and D2CO in the central regions of the core, while undeuterated H2CO is found more ubiquitously. From our radiative transfer modelling, we the column density of H2CO to be in the range of (3-8) × 1014 cm−2 and that of HDCO to be within (0.8−2.9) × 1013 cm−2. The column density for the single detected velocity component of D2CO is within (2.6–1.3) × 1012 cm−2. This yields an average D/H ratio for formaldehyde in [BHB2007] 11 of $0.02_{ - 0.01}^{ + 0.02}$ from HDCO. The results of our kinematic model suggest that the dynamic feature is inconsistent with a streamer-like nature given the flat and outflowing velocity relation; we therefore tentatively conclude that the feature is an asymmetric molecular outflow launched by a wide-angle disk wind.
Authors 19
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Lucy Evans corresponding
Centre National de la Recherche Scientifique · University of Leeds · Université Toulouse III - Paul Sabatier · Arcetri Astrophysical Observatory · Institut de Recherche en Astrophysique et Planétologie · Université de Toulouse
Affiliation as printed
INAF-Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, I-50125, Florence, Italy
IRAP, Université de Toulouse, CNRS, CNES, UPS, Toulouse, France
School of Physics and Astronomy, University of Leeds, Leeds LS2 9JT, UK
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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 , 9 av. du Colonel Roche , BP 44346 , 31028 Toulouse , France
IRAP, Université de Toulouse, CNRS, CNES, UPS, Toulouse, 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 , Florence , Italy
INAF-Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, I-50125, Florence, Italy
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Max Planck Institute for Extraterrestrial Physics
Affiliation as printed
Max-Planck-Institut für extraterrestrische Physik (MPE) , Gießenbachstr. 1 , 85741 Garching , Germany
Max-Planck-Institut für extraterrestrische Physik (MPE), Gießenbachstr. 1, D-85741 Garching, Germany
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Affiliation as printed
Centro de Astrobiologia (CSIC-INTA) , Ctra. de Torrejon a Ajalvir , km 4 , 28850 , Torrejon de Ardoz , Spain
Centro de Astrobiologia (CSIC-INTA), Ctra. de Torrejon a Ajalvir, km 4, 28850, Torrejon de Ardoz, Spain
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Max Planck Institute for Extraterrestrial Physics
Affiliation as printed
Max-Planck-Institut für extraterrestrische Physik (MPE) , Gießenbachstr. 1 , 85741 Garching , Germany
Max-Planck-Institut für extraterrestrische Physik (MPE), Gießenbachstr. 1, D-85741 Garching, Germany
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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
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
Leiden Observatory, Leiden University, P.O. Box 9513, 2300 RA Leiden, The Netherlands
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Max Planck Institute for Extraterrestrial Physics
Affiliation as printed
Max-Planck-Institut für extraterrestrische Physik (MPE) , Gießenbachstr. 1 , 85741 Garching , Germany
Max-Planck-Institut für extraterrestrische Physik (MPE), Gießenbachstr. 1, D-85741 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
Université Grenoble Alpes , CNRS , Institut de Planétologie et d'Astrophysique de Grenoble (IPAG) , 38058 Grenoble Cedex 9 , France
Université Grenoble Alpes, CNRS, Institut de Planétologie et d'Astrophysique de Grenoble (IPAG), 38000 Grenoble, France
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National Radio Astronomy Observatory
Affiliation as printed
National Radio Astronomy Observatory , PO Box O , Socorro , NM 87801 , USA
National Radio Astronomy Observatory, PO Box O, Socorro, NM 87801, USA
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National Radio Astronomy Observatory
Affiliation as printed
National Radio Astronomy Observatory , PO Box O , Socorro , NM 87801 , USA
National Radio Astronomy Observatory, PO Box O, Socorro, NM 87801, USA
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Affiliation as printed
European Southern Observatory , Karl-Schwarzschild Str. 2 , 85748 Garching bei München , Germany
European Southern Observatory, Karl-Schwarzschild Str. 2, 85748 Garching bei München, 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 , 50125 , Florence , Italy
Université Grenoble Alpes , CNRS , Institut de Planétologie et d'Astrophysique de Grenoble (IPAG) , 38058 Grenoble Cedex 9 , France
INAF-Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, I-50125, Florence, Italy
Université Grenoble Alpes, CNRS, Institut de Planétologie et d'Astrophysique de Grenoble (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
RIKEN Cluster for Pioneering Research, 2-1, Hirosawa, Wako-shi, Saitama 351-0198, Japan
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Centre National de la Recherche Scientifique · Institut de Planétologie et d'Astrophysique de Grenoble · Université Grenoble Alpes
Affiliation as printed
Université Grenoble Alpes , CNRS , Institut de Planétologie et d'Astrophysique de Grenoble (IPAG) , 38058 Grenoble Cedex 9 , France
Université Grenoble Alpes, CNRS, Institut de Planétologie et d'Astrophysique de Grenoble (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
Université Grenoble Alpes , CNRS , Institut de Planétologie et d'Astrophysique de Grenoble (IPAG) , 38058 Grenoble Cedex 9 , France
Institut de Radioastronomie Millimétrique (IRAM), 300 rue de la Piscine, 38406 Saint-Martin-d'Hères, France
Université Grenoble Alpes, CNRS, Institut de Planétologie et d'Astrophysique de Grenoble (IPAG), 38000 Grenoble, France
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National Radio Astronomy Observatory
Affiliation as printed
National Radio Astronomy Observatory , PO Box O , Socorro , NM 87801 , USA
National Radio Astronomy Observatory, PO Box O, Socorro, NM 87801, USA
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Affiliation as printed
Department of Physics , The University of Tokyo , 7-3-1 , Hongo , Bunkyo-ku , Tokyo 113-0033 , Japan
Research Center for the Early Universe , The University of Tokyo , 7-3-1 , Hongo , Bunkyo-ku , Tokyo 113-0033 , Japan
Department of Physics, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
Research Center for the Early Universe, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
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