J/A+A/683/A22ivo://CDS.VizieR/J/A+A/683/A22doi:10.26093/cds/vizier.36830022CDSMilli J.Choquet E.Tazaki R.Menard F.Augereau J.-C.Olofsson J.,Thebault P.Poch O.Levasseur-Regourd A.-C.Lasue J.Renard J.-B.,Hadamcik E.Baruteau C.Schmid H.M.Engler N.van Holstein R.G.,Zubko E.Lagrange A.-M.Marino S.Pinte C.Dominik C.Boccaletti A.,Langlois M.Zurlo A.Desgrange C.Gluck L.Mouillet D.Costille A.,Sauvage J.-F.2024-11-07T20:01:46Z2024-03-01T09:29:12ZCDS support team

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

cds-question@unistra.frearly-type-starspolarimetryinfrared-astronomyPolarisation is a powerful remote-sensing tool to study the nature of particles scattering the starlight. It is widely used to characterise interplanetary dust particles in the Solar System and increasingly employed to investigate extrasolar dust in debris discs' systems. We aim to measure the scattering properties of the dust from the debris ring around HD 181327 at near-infrared wavelengths. We obtained high-contrast polarimetric images of HD 181327 in the H band with the SPHERE/IRDIS instrument on the Very Large Telescope (ESO). We complemented them with archival data from HST/NICMOS in the F110W filter reprocessed in the context of the Archival Legacy Investigations of Circumstellar Environments (ALICE) project. We developed a combined forward-modelling framework to simultaneously retrieve the scattering phase function in polarisation and intensity. We detected the debris disc around HD 181327 in polarised light and total intensity. We measured the scattering phase function and the degree of linear polarisation of the dust at 1.6um in the birth ring. The maximum polarisation is 23.6%+/-2.6% and occurs between a scattering angle of 70{deg} and 82{deg}. We show that compact spherical particles made of a highly refractive and relatively absorbing material in a differential power-law size distribution of exponent -3.5 can simultaneously reproduce the polarimetric and total intensity scattering properties of the dust. This type of material cannot be obtained with a mixture of silicates, amorphous carbon, water ice, and porosity, and requires a more refracting component such as iron-bearing minerals. We reveal a striking analogy between the near-infrared polarisation of comets and that of HD 181327. The methodology developed here combining VLT/SPHERE and HST/NICMOS may be applicable in the future to combine the polarimetric capabilities of SPHERE with the sensitivity of JWST.2024A&A...683A..22Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/683/A22CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/595/A31 : SAM detection limits of 8 debris disks (Gauchet+, 2016)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/683/A22https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/683/A22http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/683/A22https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/683/A22https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/683/A22http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/683/A22GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/683/A22/list (List of fits images)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/683/A22/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/683/A22/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/683/A22/list?GETtext/xml+votable180.050000true290.74737-54.539820.0055555555555555566/47205https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/683/A22?format=asciiInfrareddefaultJ/A+A/683/A22/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.mainscaleScale of the imagearcsec/pixinstr.scalefloatNxNumber 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.fitschar