Physics
Scientific paper
Apr 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010atnf.prop.3201p&link_type=abstract
ATNF proposal C2342, Semester: April, 2010
Physics
Star Formation, Atca
Scientific paper
Since the discovery of the so-called "Vega phenomenon" by IRAS, we know that some relatively 'old' stars systems harbor optically thin, and sometimes large (several 100 AU) dusty disks. These "debris disks" are believed to result from the collidions and/or evaporation of a reservoir of unseen planetesimals, similar to the Kuiper belt or the inner Oort cloud of our solar system. Since different observing wavelengths probe different dust temperatures and therefore different regions of the disks, millimetric observations unveil cold, large grains - dust populations unobservable at shorter wavelengths. Therefore mm observations are the best tracers of the outer edge of the planetesimal population. We propose to use ATCA to detect these cold dust populations around two recently resolved debris disks: HD172555 and HD181327. Both have been resolved at 870 um and thus are known to host cold dust populations but the achieved angular resolution and sensitivities were not sufficient to study in the morphology of the outer disks regions in details. The goal of this proposal is to map with unprecedented angular resolution these two nearby debris disks.
Augereau Jean-Charles
Brandecker Alexis
Gonzalez Jean-FranăƒÂ§Ois
Lestrade Jean-Francois
Liseau Rene
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