TMAS Visible Light AO Instrument Observing Candidate Observing Modes
Note all numbers on this page has yet to be verified!
TMAS cameras
- Leading option
- 2 ea. Andor 5 MPix CMOS cameras from Gregg Hallinan
- Backup options
- 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 |
This topic: Palomar/TMAS
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Topic revision: r4 - 2011-09-13 - RichardDekany