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Published on November 13, 2007

Author: Callia

Source: authorstream.com

Sidestepping Seeing in Antarctica:  Sidestepping Seeing in Antarctica James Lloyd California Institute of Technology NSF Center for Adaptive Optics Site Characteristics:  Site Characteristics 10 years of Site Testing Background Seeing Direct Images Tower Microthermal H-DIMM Balloon Microthermal SODAR Marks et al (1999) So What’s the Niche?:  So What’s the Niche? Slide5:  What’s left after you control the wavefront? Adaptive Optics Narrow Angle Astrometry with Long Baseline Interferometer Adaptive Optics:  Adaptive Optics Adaptive Optics:  Adaptive Optics Adaptive Optics:  Adaptive Optics Real Data:  Real Data Strehl Gain:  Strehl Gain Marechal Approximation:  Marechal Approximation Born & Wolf, or Sivaramakrishnan et al (2002) ApJ Marechal Approximation:  Marechal Approximation Think Fourier Components… Marechal Approximation:  Marechal Approximation “Coherent” s2 << 1 Marechal Approximation:  Marechal Approximation “Incoherent” s2 >> 1 Fringe Herding:  Fringe Herding Marechal Approximation:  Marechal Approximation Mauna Kea, H band (1.6 mm) Marechal Approximation:  Marechal Approximation Mauna Kea, V band (0.5 mm) Interlude:  Interlude Turbulence Parameters:  Turbulence Parameters r0:  r0 s2=1 rad2 T0:  T0 s2=1 rad2 q0:  q0 Coherence Volume:  Coherence Volume cT0 d0:  d0 sd2:  sd2 Interferometry:  Interferometry Delay Line Beam Combiner Fringe Interferometry:  Interferometry Interferometer Fringe Wavefront Phase (Position) Interferometry:  Interferometry Interferometer Fringe Wavefront With Fringe Tracker Dual Star Interferometer:  Dual Star Interferometer Dual Star Interferometry:  Dual Star Interferometry Interferometer Fringe Wavefront With Fringe Tracker Dual Star Interferometer:  Dual Star Interferometer Turbulence Theory:  Turbulence Theory Astrometric Mean Square Error (Shao & Colavita 1992) Astrometric Science:  Astrometric Science Extrasolar Planets:  Extrasolar Planets Differential Phase:  Differential Phase Saumon, D., Hubbard, W. B., Burrows, A., Guillot, T., Lunine, J. I., & Chabrier, G. 1996, ApJ, 460, 993 Differential Phase:  Differential Phase Interferometer Fringe Center of Light Differential Phase:  Differential Phase Saumon, D., Hubbard, W. B., Burrows, A., Guillot, T., Lunine, J. I., & Chabrier, G. 1996, ApJ, 460, 993 Results:  Results Site Comparison:  Site Comparison Site Comparison:  Site Comparison Site Comparison:  Site Comparison Site Comparison:  Site Comparison Site Comparison:  Site Comparison $ $$ $$$$ $$ $ $$ $ $$$$ $$ $$$$ $$$$ A New Window t~5 t~0.5 Conclusion:  Conclusion Killer App is Interferometry One telescope is better than none One telescope is half an interferometer Visible Light AO on a 2-4m class telescope has broad appeal with no competing facility post-HST DMT+AO is a good first step towards a major observatory Lick AO System:  Lick AO System Lick AO System:  Lick AO System Lick AO System:  Lick AO System

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