J/A+A/631/A108ivo://CDS.VizieR/J/A+A/631/A108doi:10.26093/cds/vizier.36310108CDSKluska J.Van Winckel H.Hillen M.Berger J.-P.Kamath D.,Le Bouquin J.-B.Min M.2019-11-05T07:04:37Z2019-11-05T08:03:48ZCDS support team

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

cds-question@unistra.frmultiple-starsinfrared-sourcesinterferometryPost-asymptotic giant branch (pAGB) binaries are surrounded by circumbinary disks of gas and dust that are similar to protoplanetary disks found around young stars. We aim to understand the structure of these disks and identify the physical phenomena at play in their very inner regions. We want to understand the disk-binary interaction and to further investigate the comparison with protoplanetary disks. We conducted an interferometric snapshot survey of 23 post-AGB binaries in the near-infrared (H-band) using VLTI/PIONIER. We fit the multi-wavelength visibilities and closure phases with purely geometrical models with an increasing complexity (including two point-sources, an azimuthally modulated ring, and an over-resolved flux) in order to retrieve the sizes, temperatures, and flux ratios of the different components. All sources are resolved and the different components contributing to the H-band flux are dissected. The environment of these targets is very complex: 13/23 targets need models with thirteen or more parameters to fit the data. We find that the inner disk rims follow and extend the size-luminosity relation established for disks around young stars with an offset toward larger sizes. The measured temperature of the near-infrared circumstellar emission of post-AGB binaries is lower (Tsub~1200K) than for young stars, which is probably due to a different dust mineralogy and/or gas density in the dust sublimation region. The dusty inner rims of the circumbinary disks around post-AGB binaries are ruled by dust sublimation physics. Additionally a significant amount of the circumstellar $H$-band flux is over-resolved (more than 10% of the non-stellar flux is over-resolved in 14 targets). This hints that a source of unknown origin, either a disk structure or outflow. The amount of over-resolved flux is larger than around young stars. Due to the complexity of these targets, interferometric imaging is a necessary tool to reveal the interacting inner regions in a model-independent way.2019A&A...631A.108Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/631/A108CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/631/A108https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/631/A108http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/631/A108https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/631/A108https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/631/A108http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/631/A108GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/631/A108/fitparam (Best-fit parameters of the most likely model)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/631/A108/fitparam?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/631/A108/fitparam?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/631/A108/fitparam?GETtext/xml+votable180.050000true277.567656121.86683830.0055555555555555566/18436 21090 21567 22450 28722 30221 30498 31766 32181 37245 37306 37365 37881 38021 38438 38812 41212 41815 42197 42295 43535 43559 43651https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/631/A108?format=asciiInfrareddefaultJ/A+A/631/A108/fitparamBest-fit parameters of the most likely modelE_PA? one sigma upper limit of PA (suPA)degstat.error;stat.maxintnullablee_PA? one sigma lower limit of PA (slPA)degstat.errorintnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDTarget index (ID)meta.code;spect.indexintTargetName of the target (Target)meta.id;meta.maincharNdataNumber of data points (ndata)meta.numberintModelname of the most likely model (model)meta.id;stat.param;meta.modelledcharBICBayesian Information Criterion value (BIC)stat.fit.paramfloatchi2redReduced chi2 (chi2red)stat.fit.chi2floatfprim0? primary-to-total flux ratio at 1.65um (fprim0)phot.flux;em.IR.H;arith.ratiofloatnullableE_fprim0? one sigma upper limit of fprim0 (sufprim0)stat.error;stat.maxfloatnullablee_fprim0? one sigma lower limit of fprim0 (slfprim0)stat.errorfloatnullablefsec0? secondary-to-total flux ratio at 1.65um (fsec0)phot.flux;em.IR.H;arith.ratiofloatnullableE_fsec0? one sigma upper limit of fsec0 (sufsec0)stat.error;stat.maxfloatnullablee_fsec0? one sigma lower limit of fsec0 (slfsec0)stat.errorfloatnullablefbg0? background-to-total flux ratio at 1.65um (fbg0)phot.flux;em.IR.H;arith.ratiofloatnullableE_fbg0? one sigma upper limit of fbg0 (sufbg0)stat.error;stat.maxfloatnullablee_fbg0? one sigma lower limit of fbg0 (slfbg0)stat.errorfloatnullabledsec? spectral index of the secondary (dsec)spect.indexfloatnullableE_dsec? one sigma upper limit of dsec (sudsec)stat.error;stat.maxfloatnullablee_dsec? one sigma lower limit of dsec (sldsec)stat.errorfloatnullabledback? spectral index of the background (dback)spect.indexfloatnullableE_dback? one sigma upper limit of dback (sudback)stat.error;stat.maxfloatnullablee_dback? one sigma lower limit of dback (sldback)stat.errorfloatnullableTring? ring temperature (Tring)Kphys.temperatureintnullableE_Tring? one sigma upper limit of Tring (suTring)Kstat.error;stat.maxintnullablee_Tring? one sigma lower limit of Tring (slTring)Kstat.errorintnullablerD? ring diameter (rD)masphys.angSizefloatnullableE_rD? one sigma upper limit of rD (surD)masstat.error;stat.maxfloatnullablee_rD? one sigma lower limit of rD (slrD)masstat.errorfloatnullablerW? ring width in units of ring diameter (rW)phys.angSize;srcfloatnullableE_rW? one sigma upper limit of rW (surW)stat.error;stat.maxfloatnullablee_rW? one sigma lower limit of rW (slrW)stat.errorfloatnullableinc? ring inclination (inc)degsrc.orbital.inclinationfloatnullableE_inc? one sigma upper limit of inc (suinc)degstat.error;stat.maxfloatnullablee_inc? one sigma lower limit of inc (slinc)degstat.errorfloatnullablePA? ring Position Angle (PA)degpos.posAngintnullablec1? c1 coefficient of azimuthal ring modulation (c1)phot.colorfloatnullableE_c1? one sigma upper limit of c1 (suc1)stat.error;stat.maxfloatnullablee_c1? one sigma lower limit of c1 (slc1)stat.errorfloatnullables1? s1 coefficient of azimuthal ring modulation (s1)stat.fit.paramfloatnullableE_s1? one sigma upper limit of s1 (sus1)stat.error;stat.maxfloatnullablee_s1? one sigma lower limit of s1 (sls1)stat.errorfloatnullablec2? c2 coefficient of azimuthal ring modulation (c2)meta.notefloatnullableE_c2? one sigma upper limit of c2 (suc2)stat.error;stat.maxfloatnullablee_c2? one sigma lower limit of c2 (slc2)stat.errorfloatnullables2? s2 coefficient of azimuthal ring modulation (s2)stat.fit.paramfloatnullableE_s2? one sigma upper limit of s2 (sus2)stat.error;stat.maxfloatnullablee_s2? one sigma lower limit of s2 (sls2)stat.errorfloatnullableoffsetx? RA offset of the primary w.r.t. the ring centre (offsetx)maspos.angDistance;pos.eq.rafloatnullableE_offsetx? one sigma upper limit of offsetx (suoffsetx)masstat.error;stat.maxfloatnullablee_offsetx? one sigma lower limit of offsetx (sloffsetx)masstat.errorfloatnullableoffsety? DEC offset of the primary w.r.t. the ring centre (offsety)maspos.angDistance;pos.eq.decfloatnullableE_offsety? one sigma upper limit of offsety (suoffsety)masstat.error;stat.maxfloatnullablee_offsety? one sigma lower limit of offsety (sloffsety)masstat.errorfloatnullablerM? mass ratio between the primary and the secondary (rM)phys.mass;arith.ratiofloatnullableE_rM? one sigma upper limit of rM (surM)stat.error;stat.maxfloatnullablee_rM? one sigma lower limit of rM (slrM)stat.errorfloatnullableprimD? diameter of the primary (primD)masphys.angSizefloatnullableE_primD? one sigma upper limit of primD (suprimD)masstat.error;stat.maxfloatnullablee_primD? one sigma lower limit of primD (slprimD)masstat.errorfloatnullablesecD? diameter of the secondary (secD)masphys.angSizefloatnullableE_secD? one sigma upper limit of secD (susecD)masstat.error;stat.maxfloatnullablee_secD? one sigma lower limit of secD (slsecD)masstat.errorfloatnullableSimbadSimbad column added by the CDSmeta.ref.urlchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.main