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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 742757.0, MPI für Astronomie / Publikationen_mpia
The Flying Saucer: Tomography of the thermal and density gas structure of an edge-on protoplanetary disk
Authors:Dutrey, A.; Guilloteau, S.; Piétu, V.; Chapillon, E.; Wakelam, V.; Di Folco, E.; Stoecklin, T.; Denis-Alpizar, O.; Gorti, U.; Teague, R.; Henning, T.; Semenov, D.; Grosso, N.
Date of Publication (YYYY-MM-DD):2017
Title of Journal:Astronomy and Astrophysics
Start Page:id. A130 (14 pp)
Audience:Not Specified
Abstract / Description:Context. Determining the gas density and temperature structures of protoplanetary disks is a fundamental task in order to constrain planet formation theories. This is a challenging procedure and most determinations are based on model-dependent assumptions. <BR /> Aims: We attempt a direct determination of the radial and vertical temperature structure of the Flying Saucer disk, thanks to its favorable inclination of 90 degrees. <BR /> Methods: We present a method based on the tomographic study of an edge-on disk. Using ALMA, we observe at 0.5″ resolution the Flying Saucer in CO J = 2-1 and CS J = 5-4. This edge-on disk appears in silhouette against the CO J = 2-1 emission from background molecular clouds in ρ 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 provide a direct measure of the gas temperature as a function of radius and height above the disk mid-plane. <BR /> Results: The overall thermal structure is consistent with model predictions, with a cold (<12-15 K) CO-depleted mid-plane and a warmer disk atmosphere. However, we find evidence for CO gas along the mid-plane beyond a radius of about 200 au, coincident with a change of grain properties. Such behavior is expected in the case of efficient rise of UV penetration re-heating the disk and thus allowing CO thermal desorption or favoring direct CO photo-desorption. CO is also detected at up to 3-4 scale heights, while
Free Keywords:circumstellar matter; protoplanetary disks; radio lines: stars
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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