J/A+A/626/A54ivo://CDS.VizieR/J/A+A/626/A54doi:10.26093/cds/vizier.36260054CDSMilli 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.Pragt J.2019-08-06T15:12:06Z2019-06-19T09:05:00ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frvariable-starspolarimetryThe 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. We aim to measure the morphology and scattering properties of the dust from the debris ring around HR4796A in polarised optical light. We obtained high-contrast polarimetric images of HR4796A in the wavelength range 600-900nm with the SPHERE/ZIMPOL instrument on the Very Large Telescope. 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.2019A&A...626A..54Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/626/A54CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/626/A54https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/626/A54http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/626/A54https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/626/A54https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/626/A54http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/626/A54GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/626/A54/list (List of fits images)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/626/A54/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/626/A54/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/626/A54/list?GETtext/xml+votable180.050000true189.00425-39.86950.005555555555555556Associated datahttps://cdsarc.cds.unistra.fr/assocdata/?obs_collection=J/A+A/626/A546/43677https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/626/A54?format=asciidefaultJ/A+A/626/A54/listList of fits imagesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right Ascension of center (J2000)degpos.eq.ra;meta.mainDEJ2000Declination of center (J2000)degpos.eq.dec;meta.mainNxNumber of pixels along X-axismeta.numberintNyNumber of pixels along Y-axismeta.numberintObs.dateObservation datestime.epoch;obsnullablesizeSize of FITS fileKibytephys.size;meta.fitsintFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fitscharAssocDataAssociated Data web pagemeta.ref.urlchar