Dust production in the debris disk around HR 4796 A
| Autor: | P. Rabou, Matías Montesinos, A. Bayo, Julien Milli, Th. Henning, Markus Janson, N. Pawellek, Juan Carlos Beamin, C. Zamora, Jean-Charles Augereau, F. Madec, Alice Zurlo, Quentin Kral, Arnaud Sevin, Marcel Carbillet, Grant M. Kennedy, Thierry Fusco, Johan Olofsson, D. P. Iglesias, Philippe Feautrier, Philippe Thébault, Matthias R. Schreiber, François Ménard, Judit Szulágyi |
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| Přispěvatelé: | Joseph Louis LAGRANGE (LAGRANGE), Université Côte d'Azur (UCA)-Université Nice Sophia Antipolis (... - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Observatoire de la Côte d'Azur, COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), University of Zurich, Pawellek, Nicole [0000-0002-9385-9820], Apollo - University of Cambridge Repository |
| Rok vydání: | 2019 |
| Předmět: |
Brightness
Planetesimal [PHYS.ASTR.IM]Physics [physics]/Astrophysics [astro-ph]/Instrumentation and Methods for Astrophysic [astro-ph.IM] 530 Physics media_common.quotation_subject FOS: Physical sciences Context (language use) Astrophysics circumstellar matter 01 natural sciences Planet 0103 physical sciences Astrophysics::Solar and Stellar Astrophysics Eccentricity (behavior) 010303 astronomy & astrophysics QC Astrophysics::Galaxy Astrophysics Solar and Stellar Astrophysics (astro-ph.SR) QB media_common Earth and Planetary Astrophysics (astro-ph.EP) Physics Debris disk 010308 nuclear & particles physics techniques: high angular resolution Astronomy and Astrophysics Radius Astrophysics - Solar and Stellar Astrophysics Radiation pressure 13. Climate action Space and Planetary Science 10231 Institute for Computational Science Astrophysics::Earth and Planetary Astrophysics Astrophysics - Earth and Planetary Astrophysics |
| Zdroj: | Astronomy and Astrophysics-A&A Astronomy and Astrophysics-A&A, EDP Sciences, 2019, 630, pp.A142. ⟨10.1051/0004-6361/201935998⟩ |
| ISSN: | 1432-0746 0004-6361 |
| DOI: | 10.1051/0004-6361/201935998 |
| Popis: | Debris disks are the natural by-products of the planet formation process. Scattered or polarized light observations are mostly sensitive to small dust grains that are released from the grinding down of bigger planetesimals. High angular resolution observations at optical wavelengths can provide key constraints on the radial and azimuthal distribution of the small dust grains. These constraints can help us better understand where most of the dust grains are released upon collisions. We present SPHERE/ZIMPOL observations of the debris disk around HR 4796 A, and model the radial profiles along several azimuthal angles of the disk with a code that accounts for the effect of stellar radiation pressure. This enables us to derive an appropriate description for the radial and azimuthal distribution of the small dust grains. Even though we only model the radial profiles along (or close to) the semi-major axis of the disk, our best-fit model is not only in good agreement with our observations but also with previously published datasets (from near-IR to sub-mm wavelengths). We find that the reference radius is located at $76.4\pm0.4$ au, and the disk has an eccentricity of $0.076_{-0.010}^{+0.016}$, with the pericenter located on the front side of the disk (north of the star). We find that small dust grains must be preferentially released near the pericenter to explain the observed brightness asymmetry. Even though parent bodies spend more time near the apocenter, the brightness asymmetry implies that collisions happen more frequently near the pericenter of the disk. Our model can successfully reproduce the shape of the outer edge of the disk, without having to invoke an outer planet shepherding the debris disk. With a simple treatment of the effect of the radiation pressure, we conclude that the parent planetesimals are located in a narrow ring of about $3.6$ au in width. Comment: 14 pages, 10 figures, accepted by A&A |
| Databáze: | OpenAIRE |
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