2019A&A...626A..54M


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.10CEST02:56:52

2019A&A...626A..54M - Astronomy and Astrophysics, volume 626A, 54-54 (2019/6-1)

Optical polarised phase function of the HR 4796A dust ring.

MILLI J., ENGLER N., SCHMID H.M., OLOFSSON J., MENARD F., KRAL Q., BOCCALETTI A., THEBAULT P., CHOQUET E., MOUILLET D., LAGRANGE A.-M., AUGEREAU J.-C., PINTE C., CHAUVIN G., DOMINIK C., PERROT C., ZURLO A., HENNING T., BEUZIT J.-L., AVENHAUS H., BAZZON A., MOULIN T., LLORED M., MOELLER-NILSSON O., ROELFSEMA R. and PRAGT J.

Abstract (from CDS):


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.

Abstract Copyright: © ESO 2019

Journal keyword(s): planet-disk interactions - techniques: high angular resolution - techniques: polarimetric - scattering - stars: individual: HR 4796A - planetary systems

VizieR on-line data: <Available at CDS (J/A+A/626/A54): list.dat fits/*>

Simbad objects: 4

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Number of rows : 4

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 HD 109573 PM* 12 36 01.0317721349 -39 52 10.222698506   5.786 5.774 7.25 5.81 A0V 551 1
2 HD 146897 Ro* 16 19 29.2420604682 -21 24 13.271535164   9.58 9.11     F2/3V 62 0
3 HD 172555 PM* 18 45 26.9004853 -64 52 16.539796   4.967 4.767     A7V 234 0
4 V* AU Mic BY* 20 45 09.5323695486 -31 20 27.241710746   10.05 8.627 9.078 6.593 M1VeBa1 893 0

    Equat.    Gal    SGal    Ecl

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2020.07.10-02:56:52

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