Galactic Science: Debris Disks

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Galactic Science: Debris Disks

Keck NGAOGalactic Science SubgroupDebris Disk Science CaseStanimir Metchev, UCLA


Science Focuses on OpticallyThin Circumstellar Disks• structure• composition• evolution• embeddedplanets?• grain growth?


Science Focuses on OpticallyThin Circumstellar Disks• structure• composition• evolution• embeddedplanets?• grain growth?Predominantly around


Grain Growth: Need High Strehl overLarge Wavelength Range & PolarimetryWFPC2F814W0.3μm0.5μm0.9μm1.25 μm1.5μm= a minNICMOSF110WNICMOSF160WNIRC2L'ObservationsModelsDuchene et al. (2004)


Requirements for Keck NGAO:Narrow-Field High-Strehl AO• Strehl ratio ≥80% at 1.6 µm:• comparable to HST• isoplanatic field r ~ 20″ at ≥1.6 µm :• AU Mic disk: r = 21″• operability in the visible: ≥0.6 µm• IR tip/tilt sensor:• disks around M stars, brown dwarfs(?)• real-time telemetry:• enhanced contrast through PSF reconstruction


Needed Simulations/Measurements• realistic 0.6 – 3.4 µm PSFs:• also coronagraphic PSFs• PSF stability over periods of 0.5 – 5 hrs:• 1 – 60 sec exposures• library of simulated PSFs with varying seeingconditions• static errors• attainable contrast at wavelengths 0.6 – 3.4microns

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