9 papers · 1 filter
The Gemini Deep Planet Survey -- GDPS
David Lafreniere, Rene Doyon, Christian Marois +10
We present the results of the Gemini Deep Planet Survey, a near-infrared adaptive optics search for giant planets and brown dwarfs around nearby young stars. The observations were…
Trigonometric parallaxes of high velocity halo white dwarf candidates
C. Ducourant, R. Teixeira, N. C. Hambly +5
The status of 38 halo white dwarf candidates identified by Oppenheimer et al. (2001) has been intensively discussed by various authors. In analyses undertaken to date, trigonometri…
Temporal Evolution of Coronagraphic Dynamic Range, and Constraints on Companions to Vega
Sasha Hinkley, Ben R. Oppenheimer, Remi Soummer +8
The major obstacle to the direct detection of companions to nearby stars is the overwhelming brightness of the host star. Current instruments employing the combination of adaptive…
Astrometry and Photometry with Coronagraphs
Anand Sivaramakrishnan, Ben R. Oppenheimer
We propose a solution to the problem of astrometric and photometric calibration of coronagraphic images with a simple optical device which, in theory, is easy to use. Our design us…
Low Order Aberrations in Band-Limited Lyot Coronagraphs
Anand Sivaramakrishnan, Remi Soummer, Allic V. Sivaramakrishnan +3
We study the way Lyot coronagraphs with unapodized entrance pupils respond to small, low order phase aberrations. This study is applicable to ground-based adaptive optics coronagra…
Polarization Effects in Reflecting Coronagraphs for White Light Applications in Astronomy
James B. Breckinridge, Ben R. Oppenheimer
The properties of metal thin films have been largely overlooked in discussions of the technical limitations and problems that arise in the field of direct detection of exoplanets.…