Guyon, Olivier, Matsuo, Taro, Angel, Roger
High contrast coronagraphic imaging of the immediate surrounding of stars requires exquisite control of low-order wavefront aberrations, such as tip-tilt (pointing) and focus. We propose an accurate,...
Buyer’s guide to telescopes at the best sites: (2009)
Dome A, Shackleton Rim, Roger Angel
Future optical/infrared telescopes will need to be much larger than today’s, if they are to address such key challenges as direct observations of Earth-like exoplanets and of the first stars formed...
Hinz, Philip M., Kenyon, Scott, Meyer, Michael R., Boss, Alan, Angel, Roger
The detection of lower mass planets now being reported via radial velocity and microlensing surveys suggests that they may be ubiquitous. If missions such as Kepler are able to confirm this, the...
A cryogenic liquid-mirror telescope on the moon to study the early universe (2008)
Angel, Roger, Worden, Simon P., Borra, Ermanno F., Eisenstein, Daniel J., Foing, Bernard, Hickson, Paul, ...
We have studied the feasibility and scientific potential of zenith observing liquid mirror telescopes having 20 to 100 m diameters located on the moon. They would carry out deep infrared surveys to...
Design for an 8 m telescope with a 3 degree field at f/1.25 - the Dark Matter Telescope (2007)
Roger Angel, Michael Lesser, Roland Sarlot, Edward Dunham
. Deep images recorded over a wide #eld of view are needed for astronomical projects as diverse as measuring cosmological parameters byweak gravitational lensing and predicting asteroid collisions...
Adaptive Optics Spectroscopy: Preliminary Theoretical Results (2007)
Jian Ge, Roger Angel, David Sandler, David S, Ler A, Chris Shelton, ...
Di#raction-limited spectroscopy with adaptive optics #AO# has several advantages over traditional seeing-limited spectroscopy. First, high resolution can be achieved without a large loss of light at...
Alan Dressler, Carnegie Institution of Washington (2007)
Roger Angel, Steward Observatory, Dana Backman, Suzan Edwards, Smith College, Malcolm Fridlund
this report is the outcome of over almost two decades of discussions within the scientific community and with various space agencies, as described in the COMPLEX, TOPS, Darwin and ExNPS reports. TPF...
Mcao Imaging At, Roger Angel, Michael Lloyd-hart, Keith Hege, Chien Peng
The 20/20 telescope is a new concept for the GSMT with two 21 m lledaperture elements. It has the light collecting power of a single 30 m telescope, but by moving the two elements apart and combining...
Coronagraph Workshop papers (2007)
Traub, Wesley A., Abe, Lyu, Angel, Roger, Arenberg, Jon, Balasubramanian, Bala, Baudoz, Pierre, ...
This volume contains the written contributions corresponding to the oral presentations of about 45 authors at the Coronagraph Workshop 2006.
Imaging extrasolar planets by stellar halo suppression in separately-corrected color bands (2004)
Codona, Johanan L., Angel, Roger
Extra-solar planets have not been imaged directly with existing ground or space telescopes because they are too faint to be seen against the halo of the nearby bright star. Most techniques being...
Mid-Infrared Imaging of the Post-AGB Star AC Herculis with the MMT Adaptive Optics System (2003)
Close, Laird M., Biller, Beth, Hoffmann, William F., Hinz, Phil M., Bieging, John H., Wildi, Francois, ...
We utilized the MMT's unique deformable secondary adaptive optics system to produce high-resolution (FWHM=0.3"), very high Strehl mid-infrared (9.8, 11.7 & 18 micron) images of the post-AGB star AC...
Close, Laird M., Wildi, Francois, Lloyd-Hart, Michael, Brusa, Guido, Fisher, Don, Miller, Doug, ...
We present the first scientific images obtained with a deformable secondary mirror adaptive optics system. We utilized the 6.5m MMT AO system to produce high-resolution (FWHM=0.07'') near infrared...
Dynamically refocused Rayleigh laser beacons for atmospheric tomography (2001)
Michael Lloyd-hart, Michael Lloyd-hart, James Georges, James Georges, Roger Angel, Roger Angel, ...
We report initial results from a prototype system to generate multiple Rayleigh laser guide stars for adaptive optics from a single pulsed laser at 354 nm wavelength. A 3.2 mW laser pulsed at 630 Hz...
Roger Angel, Michael Lloyd-hart
Single sodium beacons will likely be the most convenient for adaptive systems to correct 6-10 m class telescopes over a small field of view (the isoplanatic angle), provided reliable, powerful 589 nm...
Roger Angel And, Roger Angel, Michael Lloyd-hart
Single sodium beacons will likely be the most convenient for adaptive systems to correct 6-10 m class telescopes over a small field of view (the isoplanatic angle), provided reliable, powerful 589 nm...
Fabrication, Testing, Coating and Alignment of Fast Segmented Optics (1998)
Martin, Hubert, Angel, Roger, Burge, James, Talghader, Joseph
The report presents the results of the MRI addressing four of the most critical technologies needed to produce large-aperture, lightweight, high-power HEL systems. They are: polishing large off-axis...
Verifying Mirror Technology for NGST with a Space-Qualified, Cryogenic 3.5 M Mirror (1998)
The lightweighting and surface accuracy targeted for NGST's 8 m primary mirror has been demonstrated in a 0.5 m prototype. Now a second, 2 m prototype weighing 40 kg in total is being fabricated at...
Adaptive Optics Spectroscopy: Preliminary Theoretical Results (1997)
Ge, Jian, Angel, Roger, Sandler, David, Shelton, Chris, McCarthy, Don, Burge, Jim
We have done theoretical calculations and simulations for infrared spectroscopy at the MMT 6.5 m with laser guide star AO, which provides almost full sky coverage. The results show we can expect...
Feasibility of cooling the Earth with a cloud of small spacecraft near the inner Lagrange point (L1)
If it were to become apparent that dangerous changes in global climate were inevitable, despite greenhouse gas controls, active methods to cool the Earth on an emergency basis might be desirable. The...