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.

We will observe HD 10647 with the STIS coronagraph. We will spend 4 orbits observing it with WEDGEA2.0 to obtain a single deep image of the outer disk, then roll the telescope by 25-30 degrees and observe it again with another 4 orbits. In another set of observations, we observe HD 10647 with WEDGEA1.0 in one orbit to image the inner disk. We repeat in another orbit after rolling the telescope. Then, immediately after, we observe a reference PSF star. Orientation constraints ensure that the circumstellar disk, which extends along PA=56 deg, will be oriented perpendicular to the wedge. ISM AND CIRCUMSTELLAR MATTER 12 false 0.0 0.0 false false false false false false SUPPORTED STAR DISK EXTRA-SOLAR PLANETARY SYSTEM F3-F9 HR-506 J2000 01 42 29.3200 -53 44 27.00 J2000 STAR F3-F9 Reference PSF star for HD-10647 J2000 01 15 11.1700 -45 31 53.90 J2000 ACS/HRC Imaging Yes No F606W ACS/HRC Imaging Yes No F606W ACS/HRC Imaging Yes No F814W ACS/HRC Imaging Yes No F606W ACS/HRC Imaging Yes No F814W ACS/HRC Imaging Yes No F606W ACS/HRC Imaging Yes No F606W ACS/HRC Imaging Yes No F814W ACS/HRC Imaging Yes No F814W Timing link suitability includes constraints ([Sequence (01 02) within 0.3 days]) The scheduling data was generated by CASM 18.1. CASM was run in Phase II mode. (Tic-Visit :proposal-id 11693 :visit-id "01" :proposal-version -1 :trans-version "20100218" :date "18-May-2010 15:14:14.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 184544 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11693 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11693 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2878 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3257 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11693 :visit-id "01" :orbit-number 2 :pcs-time 222 :si-vis-utilization 3033 :al-overhead-at-end 0 :internal-dur-at-end 381 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3257 :pcs-gap 0 ) true 2 0 Timing link suitability includes constraints ([Sequence (01 02) within 0.3 days]) The scheduling data was generated by CASM 18.1. CASM was run in Phase II mode. 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CASM was run in Phase II mode. 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CASM was run in Phase II mode. 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CASM was run in Phase II mode. (Tic-Visit :proposal-id 11693 :visit-id "09" :proposal-version -1 :trans-version "20100218" :date "18-May-2010 15:12:09.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 405392 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11693 :visit-id "09" :obset-id "09" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11693 :visit-id "09" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2915 :al-overhead-at-end 0 :internal-dur-at-end 322 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3257 :pcs-gap 0 ) true 1 0 Timing link suitability includes constraints ([Sequence (09 10 11) within 0.2 days]) The scheduling data was generated by CASM 18.1. CASM was run in Phase II mode. Max roll offset from visit 09 is desired (Tic-Visit :proposal-id 11693 :visit-id "10" :proposal-version -1 :trans-version "20100218" :date "18-May-2010 15:12:11.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 405392 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11693 :visit-id "10" :obset-id "10" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11693 :visit-id "10" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2915 :al-overhead-at-end 0 :internal-dur-at-end 322 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3257 :pcs-gap 0 ) true 1 0 Timing link suitability includes constraints ([Sequence (09 10 11) within 0.2 days]) The scheduling data was generated by CASM 18.1. CASM was run in Phase II mode. 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