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Title:
Resolving the planetesimal belt of HR 8799 with ALMA
Authors:
Booth, Mark; Jordán, Andrés; Casassus, Simon; Hales, Antonio S.; Dent, William R. F.; Faramaz, Virginie; Matrà, Luca; Barkats, Denis; Brahm, Rafael; Cuadra, Jorge
Affiliation:
AA(Instituto de Astrofísica, Pontificia Universidad Católica de Chile, Vicuña Mackenna 4860, Santiago, Chile; Millennium Nucleus `Protoplanetary Disks', Santiago, Chile ), AB(Instituto de Astrofísica, Pontificia Universidad Católica de Chile, Vicuña Mackenna 4860, Santiago, Chile; Millennium Institute of Astrophysics, Vicuña Mackenna 4860, Santiago, Chile), AC(Millennium Nucleus `Protoplanetary Disks', Santiago, Chile; Departamento de Astronomia, Universidad de Chile, Casilla 36-D, Santiago, Chile), AD(Joint ALMA Observatory, Alonso de Córdova 3107, Vitacura 763-0355, Santiago, Chile; National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, Virginia 22903-2475, USA), AE(Joint ALMA Observatory, Alonso de Córdova 3107, Vitacura 763-0355, Santiago, Chile), AF(Instituto de Astrofísica, Pontificia Universidad Católica de Chile, Vicuña Mackenna 4860, Santiago, Chile), AG(Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK; European Southern Observatory, Alonso de Córdova 3107, Vitacura, Casilla 19001, Santiago, Chile), AH(Harvard University, 60 Garden Street, Cambridge, MA 02138, USA), AI(Instituto de Astrofísica, Pontificia Universidad Católica de Chile, Vicuña Mackenna 4860, Santiago, Chile; Millennium Institute of Astrophysics, Vicuña Mackenna 4860, Santiago, Chile), AJ(Instituto de Astrofísica, Pontificia Universidad Católica de Chile, Vicuña Mackenna 4860, Santiago, Chile; Millennium Nucleus `Protoplanetary Disks', Santiago, Chile)
Publication:
Monthly Notices of the Royal Astronomical Society: Letters, Volume 460, Issue 1, p.L10-L14 (MNRAS Homepage)
Publication Date:
07/2016
Origin:
OUP
Astronomy Keywords:
circumstellar matter, stars: individual: HR 8799, planetary systems, submillimetre: planetary systems, submillimetre: stars
Abstract Copyright:
2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
DOI:
10.1093/mnrasl/slw040
Bibliographic Code:
2016MNRAS.460L..10B

Abstract

The star HR 8799 hosts one of the largest known debris discs and at least four giant planets. Previous observations have found evidence for a warm belt within the orbits of the planets, a cold planetesimal belt beyond their orbits and a halo of small grains. With the infrared data, it is hard to distinguish the planetesimal belt emission from that of the grains in the halo. With this in mind, the system has been observed with ALMA in band 6 (1.34 mm) using a compact array format. These observations allow the inner edge of the planetesimal belt to be resolved for the first time. A radial distribution of dust grains is fitted to the data using an MCMC method. The disc is best fitted by a broad ring between 145^{+12}_{-12} au and 429^{+37}_{-32} au at an inclination of 40^{+5}_{-6}° and a position angle of 51^{+8}_{-8}°. A disc edge at ˜145 au is too far out to be explained simply by interactions with planet b, requiring either a more complicated dynamical history or an extra planet beyond the orbit of planet b.
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