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LAMP LuckyCam, AO, Aperture Masking and Polarization @ Palomar

LAMP LuckyCam, AO, Aperture Masking and Polarization @ Palomar. Nicholas Law (Caltech), Craig Mackay (Cambridge), Mike Ireland (Caltech), Peter Tuthill (Sydney), Jamie Lloyd (Cornell) Rich Dekany P3K Meeting 15 Feb 2007. LAMP Overview. Concept: AO-Assisted Observations in the visible

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LAMP LuckyCam, AO, Aperture Masking and Polarization @ Palomar

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  1. LAMP LuckyCam, AO, Aperture Masking and Polarization @ Palomar Nicholas Law (Caltech), Craig Mackay (Cambridge), Mike Ireland (Caltech), Peter Tuthill (Sydney), Jamie Lloyd (Cornell) Rich Dekany P3K Meeting 15 Feb 2007

  2. LAMP Overview • Concept: AO-Assisted Observations in the visible • AO L3CCD imaging from 450nm to 950nm • Takes advantage of FWHM improvement from AO • Expected Strehl ratios 0.05-0.1 • 3 modes: • Direct imaging (L3CCD sensitivity) • Aperture masking - conventional & Lucky • High-contrast imaging • Fields of view: 20 arcsec, 10 arcsec, 5 arcsec • Pixel scales: 41 mas/pixel, 20 mas/pixel, 10 mas/pixel • 6 nights on P200, early July

  3. Direct Imaging (N. Law) • Low Strehl, but good FWHM. • Fast-frame-rate L3CCD allows selection of easiest periods of turbulence. • Targeting symbiotic binaries (possible 1a supernova progenitors) - determine wind velocities, outburst histories -> mass loss rates 0.15” FWHM images with CHFT AO at 630nm Dougados et al. 2000 A&A 357 http://hubblesite.org/gallery/album/entire_collection/pr1999032a/full_jpg

  4. Aperture Masking (P. Tuthill, C. Mackay) • Place masks in pupil plane to split aperture into lots of small apertures • Reconstruct high-angular-resolution image by measuring components along baselines between apertures. • Target Mira winds • Need L3CCD for sensitivity. AO system allows much larger aperture sizes & therefore much fainter targets. • Lucky Imaging technique allows still larger aperture sizes. β CrB imaged by SRK with P200 in 1988 at 630 nm. ~0.045 arcsec FWHM First optical closure phase image, 1984, Hawaii 2.2m, with slow-scan noisy CCD. (Mackay, Baldwin, Haniff) 4 4

  5. High Contrast Polarimetry (M. Ireland) • Wollaston prism to split orthogonal polarizations into side-by-side AO-assisted images • LCVR switcher rapidly switches the order of the images • Must operate faster than turbulence coherence time • Gives direct PSF + camera effects calibration and subtraction • Dust disks are the main targets

  6. LAMP Optical Design FM2 Pupil Collimating lens Reimaging lens FM3 FM1 • 3 fold mirrors - 2 for alignment, one to fold path downwards • Use cheap achromats for collimation • 0.97 on-axis Strehl (inc. PALMAO + P200) • 0.92 edge-of-field Strehl

  7. LAMP Mechanical Design 7 7

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