A dusty filament and turbulent CO spirals in HD 135344B - SAO 206462
| Autor: | Miguel Cárcamo, Clément Baruteau, Christophe Pinte, Andrés Jordán, Philipp Weber, Lucas A. Cieza, Ewine F. van Dishoeck, Carla Arce-Tord, Olivier Absil, Simon Casassus, Christian Flores, Daniel J. Price, Virginie Faramaz, Sebastián Pérez, Nienke van der Marel, Maddalena Reggiani, Valentin Christiaens, Barbara Ercolano, Ruobing Dong |
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| Přispěvatelé: | Institut de recherche en astrophysique et planétologie (IRAP), Institut national des sciences de l'Univers (INSU - CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS) |
| Rok vydání: | 2021 |
| Předmět: |
Accretion
POLARIZATION Continuum (design consultancy) FOS: Physical sciences Protoplanetary discs PLANET SUBSTRUCTURES Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Astronomy & Astrophysics Astrophysics - Earth and planetary astrophysics 01 natural sciences LOPSIDED TRANSITION DISCS 0103 physical sciences ABSORPTION Astrophysics::Solar and Stellar Astrophysics HYDRODYNAMICAL SIMULATIONS Planet-disc interactions Pitch angle 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics Galaxy rotation curve Line (formation) Earth and Planetary Astrophysics (astro-ph.EP) Physics Science & Technology [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph] Accretion (meteorology) 010308 nuclear & particles physics Giant planet Astronomy and Astrophysics planet-disc interactions protoplanetary discs Radial velocity INTERSTELLAR C-12/C-13 GAS Space and Planetary Science Physical Sciences ACCRETION DISKS accretion accretion discs ROSSBY-WAVE INSTABILITY Astrophysics::Earth and Planetary Astrophysics Protoplanet Accretion discs |
| Zdroj: | Monthly Notices of the Royal Astronomical Society Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P-Oxford Open Option A, 2021, 507 (3), pp.3789-3809. ⟨10.1093/mnras/stab2359⟩ Monthly Notices of the Royal Astronomical Society, 507(3), 3789-3809 Monthly Notices of the Royal Astronomical Society, 2021, 507 (3), pp.3789-3809. ⟨10.1093/mnras/stab2359⟩ |
| ISSN: | 1365-2966 0035-8711 |
| Popis: | Planet-disc interactions build up local pressure maxima that may halt the radial drift of protoplanetary dust, and pile it up in rings and crescents. ALMA observations of the HD135344B disc revealed two rings in the thermal continuum stemming from ~mm-sized dust. At higher frequencies the inner ring is brighter relative to the outer ring, which is also shaped as a crescent rather than a full ring. In near-IR scattered light images, the disc is modulated by a 2-armed grand-design spiral originating inside the ALMA inner ring. Such structures may be induced by a massive companion evacuating the central cavity, and by a giant planet in the gap separating both rings, that channels the accretion of small dust and gas through its filamentary wakes while stopping the larger dust from crossing the gap. Here we present ALMA observations in the J=(2-1)CO isotopologue lines and in the adjacent continuum, with up to 12km baselines. Angular resolutions of 0.03" reveal the tentative detection of a filament connecting both rings, and which coincides with a local discontinuity in the pitch angle of the IR spiral, proposed previously as the location of the protoplanet driving this spiral. Line diagnostics suggest that turbulence, or superposed velocity components, is particularly strong in the spirals. The 12CO(2-1) 3-D rotation curve points at stellocentric accretion at radii within the inner dust ring, with a radial velocity of up to ~6%+-0.5% Keplerian, which corresponds to an excessively large accretion rate of ~2E-6M_sun/yr if all of the CO layer follows the 12CO(2-1) kinematics. This suggests that only the surface layers of the disc are undergoing accretion, and that the line broadening is due to superposed laminar flows. accepted to MNRAS |
| Databáze: | OpenAIRE |
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