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A close look into the carbon disk at the core of the planetary nebula CPD-56°8032

hal.structure.identifierLaboratoire Gemini [LG]
dc.contributor.authorCHESNEAU, O.
hal.structure.identifierLaboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux [L3AB]
dc.contributor.authorCOLLIOUD, A.
hal.structure.identifierDepartment of Astrophysics [AMNH New York] [AMNH]
dc.contributor.authorDE MARCO, O.
hal.structure.identifierMax-Planck-Institut für Astronomie [MPIA]
dc.contributor.authorWOLF, S.
hal.structure.identifierUniversity of Manchester [Manchester]
dc.contributor.authorLAGADEC, Erwan
hal.structure.identifierUniversity of Manchester [Manchester]
dc.contributor.authorZIJLSTRA, A. A.
hal.structure.identifierMax-Planck-Institut für Astronomie [MPIA]
dc.contributor.authorROTHKOPF, A.
hal.structure.identifierObservatoire astronomique de Strasbourg [OAS]
dc.contributor.authorACKER, A.
hal.structure.identifierDepartment of Physics & Astronomy [Louisiana State University] [LSU]
dc.contributor.authorCLAYTON, G. C.
hal.structure.identifierLaboratoire Hippolyte Fizeau [FIZEAU]
dc.contributor.authorLOPEZ, B.
dc.date.issued2006-09
dc.identifier.issn0004-6361
dc.description.abstractEnAims.We present high spatial resolution observations of the dusty core of the Planetary Nebula with Wolf-Rayet central star CPD-56°8032, for which indications of a compact disk have been found by HST/SITS observations. Methods: .These observations were taken with the mid-infrared interferometer VLTI/MIDI in imaging mode providing a typical 300 mas resolution and in interferometric mode using UT2-UT3 47m baseline providing a typical spatial resolution of 20 mas. We also made use of unpublished HST/ACS images in the F435W and F606W filters. Results: .The visible HST images exhibit a complex multilobal geometry dominated by faint lobes. The farthest structures are located at 7 arcsec from the star. The mid-IR environment of CPD-56°8032 is dominated by a compact source, barely resolved by a single UT telescope in a 8.7 μm filter (Δ λ=1.6~μm, contaminated by PAH emission). The infrared core is almost fully resolved with the three 40-45 m projected baselines ranging from -5° to 51° but smooth oscillating fringes at low level have been detected in spectrally dispersed visibilities. This clear signal is interpreted in terms of a ring structure which would define the bright inner rim of the equatorial disk. Geometric models allowed us to derive the main geometrical parameters of the disk. For instance, a reasonably good fit is reached with an achromatic and elliptical truncated Gaussian with a radius of 97±11 AU, an inclination of 28±7° and a PA for the major axis at 345° ±7°. Furthermore, we performed some radiative transfer modeling aimed at further constraining the geometry and mass content of the disk, by taking into account the MIDI dispersed visibilities, spectra, and the large aperture SED of the source. These models show that the disk is mostly optically thin in the N band and highly flared. As a consequence of the complex flux distribution, an edge-on inclination is not excluded by the data.
dc.language.isoen
dc.publisherEDP Sciences
dc.subject.entechniques: interferometric
dc.subject.entechniques: high angular
dc.subject.enresolution
dc.subject.enstars: AGB and post-AGB
dc.subject.enstars: circumstellar matter
dc.subject.enstars: mass-loss
dc.title.enA close look into the carbon disk at the core of the planetary nebula CPD-56°8032
dc.typeArticle de revue
dc.identifier.doi10.1051/0004-6361:20054585
dc.subject.halPhysique [physics]/Astrophysique [astro-ph]/Cosmologie et astrophysique extra-galactique [astro-ph.CO]
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]
dc.identifier.arxivastro-ph/0606745
bordeaux.journalAstronomy and Astrophysics - A&A
bordeaux.page1009-1018
bordeaux.volume455
bordeaux.peerReviewedoui
hal.identifierhal-00083203
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00083203v1
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