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The shadow of the Flying Saucer: A very low temperature for large dust grains

hal.structure.identifierAMOR 2016
dc.contributor.authorGUILLOTEAU, S.
hal.structure.identifierInstitut de RadioAstronomie Millimétrique [IRAM]
dc.contributor.authorPIÉTU, V.,
hal.structure.identifierAMOR 2016
dc.contributor.authorCHAPILLON, E.
hal.structure.identifierAMOR 2016
dc.contributor.authorDI FOLCO, E.
hal.structure.identifierAMOR 2016
dc.contributor.authorDUTREY, Anne
dc.contributor.authorHENNING, T.,
dc.contributor.authorSEMENOV, D.,
dc.contributor.authorBIRNSTIEL, T.,
hal.structure.identifierObservatoire astronomique de Strasbourg [ObAS]
dc.contributor.authorGROSSO, N.,
dc.date.issued2016
dc.identifier.issn0004-6361
dc.description.abstractEnDust determines the temperature structure of protoplanetary disks. However, dust temperature determinations almost invariably rely on a complex modeling of the Spectral Energy Distribution. We attempt a direct determination of the temperature of large grains emitting at mm wavelengths.} We observe the edge-on dust disk of the Flying Saucer, which appears in silhouette against the CO J=2-1 emission from a background molecular cloud in $\rho$ Oph. The combination of velocity gradients due to the Keplerian rotation of the disk and intensity variations in the CO background as a function of velocity allows us to directly measure the %absorbing dust temperature. The dust opacity can then be derived from the emitted continuum radiation. The dust disk absorbs the radiation from the CO clouds at several velocities. We derive very low dust temperatures, 5 to 7 K at radii around 100 au, which is much lower than most model predictions. The dust optical depth is $> 0.2$ at 230 GHz, and the scale height at 100 au is at least 8 au (best fit 13 au). However, the dust disk is very flat (flaring index -0.35), which is indicative of dust settling in the outer parts.
dc.language.isoen
dc.publisherEDP Sciences
dc.title.enThe shadow of the Flying Saucer: A very low temperature for large dust grains
dc.typeArticle de revue
dc.identifier.doi10.1051/0004-6361/201527620
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Cosmologie et astrophysique extra-galactique [astro-ph.CO]
dc.identifier.arxiv1601.01548
bordeaux.journalAstronomy and Astrophysics - A&A
bordeaux.pageidL1
bordeaux.volume586
bordeaux.peerReviewedoui
hal.identifierhal-01253543
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01253543v1
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