J/A+A/556/A123ivo://CDS.VizieR/J/A+A/556/A123doi:10.26093/cds/vizier.35560123CDSCanovas H.Menard F.Hales A.Jordan A.Schreiber M.R.Casassus S.,Gledhill T.M.Pinte C.2017-09-19T14:21:47Z2013-08-07T06:49:30ZCDS support team

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

cds-question@unistra.frvariable-starspolarimetryHD 142527 is a pre-transition disk with strong evidence for ongoing planet formation. Recent observations show a disrupted disk with spiral arms, a dust-depleted inner cavity and the possible presence of gas streams driving gas from the outer disk toward the central star. We aim to derive the morphology of the disk, and the distribution and properties of the dust at its surface. We have obtained polarized differential images of HD 142527 at H and Ks bands with NaCo at the VLT. Combining these images with classical PSF-subtraction, we are able to derive the polarization degree of this disk. Results. At H band the polarization degree of the disk varies between 10% and 25%. This result cannot be reproduced by dust distributions containing highly porous material. The polarization is better matched by distributions of compact particles, with maximum sizes at least up to a few microns, in agreement with previous observations. We also observe two regions of low emission (nulls) in total and in polarized intensity. In particular, one of these nulls is at roughly the same position as the maximum of the horse-shoe shape observed in sub- millimeter continuum emission ALMA band-7 (345GHz) observations. We discuss the possible link between these two features.2013A&A...556A.123Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/556/A123CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/546/A24 : VLT/NaCo images of HD 142527 (Rameau+, 2012)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/556/A123https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/556/A123http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/556/A123https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/556/A123https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/556/A123http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/556/A123GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/556/A123/list (FITS file list in fits directory)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/556/A123/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/556/A123/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/556/A123/list?GETtext/xml+votable180.050000true239.17499-42.323110.005555555555555556Associated datahttps://cdsarc.cds.unistra.fr/assocdata/?obs_collection=J/A+A/556/A1236/28704 42595https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/556/A123?format=asciiOpticaldefaultJ/A+A/556/A123/listFITS file list in fits directoryNameHD name (HD 142527 or HD 161743)meta.numbercharrecnoRecord 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.mainScale[0.0272] Scale of the imagearcsec/pixinstr.scalefloatNx[160] Number of pixels along X-axispixmeta.numberintNy[160] Number of pixels along Y-axispixmeta.numberintNz[4] Number of Stokes parametersmeta.numberintExp[0.4/15] Exposure timestime.duration;obs.exposurefloatFilt[H Ks] Filtermeta.id;instr.filtercharFITSDownload the FITS polarimtric filemeta.ref.urlcharFileNameName of FITS file in subdirectory fitsmeta.id;meta.fitscharSimbadSimbad column added by the CDSmeta.ref.urlchar