TMAS Visible Light AO Instrument Observing Candidate Observing Modes

Note all numbers on this page has yet to be verified!

TMAS cameras
  • Andor = 1k x 1k, Fast-frame (30 Hz) enabled, photon-counting option, 13 um pixel
  • CCD21 = 1k x 1k, Mature science GUI (from DBSP), ?? um pixel

TMAS foci
  • F/43 (TBC), 1.193 mm/" or 0.8385 "/mm (TBC), goal is 12 mas/pixel on Andor
  • F/15 (TBC), goal is 48 mas/pixel on CCD21, physical diffraction width = lambda * F# = 0.6 * 15 = 9 um (TBC)

AO modes
  • S64 = 64 x 64 subaperture AO correction, limiting mag R ~ 7 provides 0.6um SR ~ 10%, 0.8um SR ~ 20%, FWHM < 0.2" at 35" off-axis
  • S32 = 32 x 32 subaperture AO correction, limiting mag R ~ 10 provides visible FWHM < 0.2" on-axis, ~0.3" at 35" off-axis
  • S8 = 8 x 8 subaperture AO correction, limiting mag R ~ 17 provides visible FWHM ~ 0.4" on- or off-axis

AO beamsplitters
  • 50/50 beamsplitter
  • 80/20 visible (trans/refl) + long pass beyond 970nm (TBC)
  • 650 nm long pass
  • 750 nm long pass (TBC)
  • 970 nm long pass

TMAS observing modes
Mode Number AO config F/43 focus F/11 focus Science Case
1 S64 Imaging filter Acquisition 12 mas/pixel imaging for all visible wavelengths
AO-assisted speckle (Lucky) imaging (Hildebrandt)
Lowest R imaging of faintest targets
2 S64 or S32 Imaging filter 1 Imaging filter 2 Dual-color photometry on different plate scales
Narrow field PSF reference for wider-field astrometry
Scattered light subtraction for extragalactic emission line science (Dekany)
3 S64 or S32 Flexure and exp. meter Single-mode fiber 10 cm/s precision radial velocity for exoplanet study (Johnson)
> 650nm for WFS < 500nm for Andor feeding precision RV spectrograph (need to identify)
4 S32 or S64 Flexure compensation Imaging filter 2 Deep (long-exposure) visible imagery / galaxy morphology / UDF
Red-channel coronagraphy (e.g. Serabyn (vortex coronagraphy))
5 S8 TBD GLAO w/ ~0.3" FWHM across moderate field Astrometry survey / identification of transients contexts
across visible wavelength
6 S8 Flexure & DAR Dual, scrambled multi-mode fiber 5 m/s RV of close (<2") binary stars (Johnson)
compensation w/ one on 2-axis stage
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Topic revision: r3 - 2011-09-02 - RichardDekany
 
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