| Issue |
A&A
Volume 626, June 2019
|
|
|---|---|---|
| Article Number | A54 | |
| Number of page(s) | 11 | |
| Section | Planets and planetary systems | |
| DOI | https://doi.org/10.1051/0004-6361/201935363 | |
| Published online | 12 June 2019 | |
Optical polarised phase function of the HR 4796A dust ring★
1
European Southern Observatory (ESO),
Alonso de Córdova 3107, Vitacura,
Casilla
19001,
Santiago,
Chile
e-mail: jmilli@eso.org
2
Institute for Particle Physics and Astrophysics, ETH Zurich,
Wolfgang-Pauli-Strasse 27,
8093
Zurich,
Switzerland
3
Max Planck Institute for Astronomy,
Königstuhl 17,
69117
Heidelberg,
Germany
4
Instituto de Física y Astronomía, Facultad de Ciencias, Universidad de Valparaíso,
Av. Gran Bretaña 1111, Playa Ancha,
Valparaíso, Chile
5
Núcleo Milenio Formación Planetaria - NPF, Universidad de Valparaíso,
Av. Gran Bretaña 1111,
Valparaíso,
Chile
6
Université Grenoble Alpes, CNRS, IPAG,
38000
Grenoble,
France
7
LESIA, Observatoire de Paris, Université PSL, CNRS, Sorbonne Université, Université Paris Diderot, Sorbonne Paris Cité,
5 place Jules Janssen,
92195
Meudon,
France
8
Aix-Marseille Université, CNRS, CNES, LAM,
Marseille,
France
9
UMI-FCA, CNRS/INSU France (UMI 3386), and Departamento de Astronomia, Universidad de Chile,
Casilla 36-D
Santiago, Chile
10
Anton Pannekoek Institute for Astronomy,
Science Park 904,
1098 XH
Amsterdam,
The Netherlands
11
Núcleo de Astronomía, Facultad de Ingeniería y Ciencias, Universidad Diego Portales,
Av. Ejercito 441,
Santiago, Chile
12
Escuela de Ingeniería Industrial, Facultad de Ingeniería y Ciencias, Universidad Diego Portales,
Av. Ejercito 441,
Santiago,
Chile
13
NOVA Optical Infrared Instrumentation Group,
Oude Hoogeveensedijk 4,
7991 PD Dwingeloo, The Netherlands
Received:
26
February
2019
Accepted:
28
April
2019
Context. The scattering properties of the dust originating from debris discs are still poorly known. The analysis of scattered light is however a powerful remote-sensing tool to understand the physical properties of dust particles orbiting other stars. Scattered light is indeed widely used to characterise the properties of cometary dust in the solar system.
Aims. We aim to measure the morphology and scattering properties of the dust from the debris ring around HR 4796 A in polarised optical light.
Methods. We obtained high-contrast polarimetric images of HR 4796 A in the wavelength range 600–900 nm with the SPHERE/ZIMPOL instrument on the Very Large Telescope.
Results. We measured for the first time the polarised phase function of the dust in a debris system over a wide range of scattering angles in the optical. We confirm that it is incompatible with dust particles being compact spheres under the assumption of the Mie theory, and propose alternative scenarios compatible with the observations, such as particles with irregular surface roughness or aggregate particles.
Key words: planet-disk interactions / techniques: high angular resolution / techniques: polarimetric / scattering / stars: individual: HR 4796A / planetary systems
The reduced images (FITS files) presented in Fig. 1 are only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/626/A54
© ESO 2019
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