Physics
Scientific paper
Jul 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008hst..prop11693k&link_type=abstract
HST Proposal ID #11693. Cycle 17
Physics
Scientific paper
Circumstellar debris disks offer direct views into the structure of extrasolar planetary systems. Their constituent dust, seen in scattered light and thermal emission, is created by the collisions of asteroidal and cometary parent bodies. The distribution of this dust provides information on the location of the parent bodies, and can be strongly affected by planetary perturbations. Dynamical signatures of planets can include asymmetries, warps, central clearings, and radial gaps in a disk, and thus are key features to search for in resolved images. Following up recent Spitzer measurements, we have now detected two new, nearby debris disks in scattered light. Our initial ACS F606W coronagraphic images show faint ringlike structures around the solar-type stars HD 10647 {F9V} and HD 207129 {G0V}; both are also spatially resolved in Spitzer/MIPS 70 micron images. The HD 10647 disk, seen close to edge-on, represents the first disk ever imaged in scattered light around a star known to have a radial velocity planet. The inclined ring around HD 207129 is the faintest disk ever imaged in scattered light, and seems in the MIPS image to be asymmetric like the eccentric ring around Fomalhaut. We propose to obtain deep ACS coronagraphic images of these two disks. Our goals are to get definitive measurements of the dust spatial distributions {including disk asymmetries and sharpness of the ring edges}, and measure the overall F606W-F814W color of each disk in order to constrain the dust properties. The results will be a definitive exploration of the Kuiper belts of two nearby, Sun-like stars. NOTE: HD 207129 was deleted from this program.;
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