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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 421320.0, MPI für Astronomie / Publikationen_mpia
Reflected light from sand grains in the terrestrial zone of a protoplanetary disk
Authors:Herbst, William; Hamilton, Catrina M.; Leduc, Katherine; Winn, Joshua N.; Johns-Krull, Christopher M.; Mundt, Reinhard; Ibrahimov, Mansur
Date of Publication (YYYY-MM-DD):2008
Title of Journal:Nature
Start Page:194
End Page:197
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:In the standard model of terrestrial planet formation, the first step in the process is for interstellar dust to coagulate within a protoplanetary disk surrounding a young star, forming large grains that settle towards the disk plane. Interstellar grains of typical size ~0.1mum are expected to grow to millimetre- (sand), centimetre- (pebble) or even metre-sized (boulder) objects rather quickly. Unfortunately, such evolved disks are hard to observe because the ratio of surface area to volume of their constituents is small. We readily detect dust around young objects known as `classical' T Tauri stars, but there is little or no evidence of it in the slightly more evolved `weak-line' systems. Here we report observations of a 3-Myr-old star, which show that grains have grown to about millimetre size or larger in the terrestrial zone (within ~3AU) of this star. The fortuitous geometry of the KH 15D binary star system allows us to infer that, when both stars are occulted by the surrounding disk, it appears as a nearly edge-on ring illuminated by one of the central binary components. This work complements the study of terrestrial zones of younger disks that have been recently resolved by interferometry.
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL: [ID No:1]
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