559 citations · 8.9k across the 196 of their papers we have counts for
17 papers · 1 filter
The ultracool eld dwarfs luminosity function from the Canada-France Brown Dwarf Survey
C. Reyle, P. Delorme, X. Delfosse +4
The Canada-France Brown Dwarf Survey is a wide eld survey for cool brown dwarfs conducted with the MegaCam camera on the CFHT telescope. Our objectives are to nd ultracool brown dw…
On the Age of the Widest Very Low Mass Binary
Etienne Artigau, David Lafreniere, Loic Albert +1
We have recently identified the widest very low-mass binary (2M0126AB), consisting of an M6.5V and an M8V dwarf with a separation of ~5100 AU, which is twice as large as that of th…
SIMP: A Near-Infrared Proper Motion Survey
Etienne Artigau, David Lafreniere, Rene Doyon +3
SIMP is a proper motion (PM) survey made with the Observatoire du Mont Megantic (OMM) wide-field near-infrared camera CPAPIR at the CTIO 1.5 m and OMM 1.6 m telescopes. The SIMP ob…
Observing Strategies for the NICI Campaign to Directly Image Extrasolar Planets
Beth Biller, Etienne Artigau, Zahed Wahhaj +7
We discuss observing strategy for the Near Infrared Coronagraphic Imager (NICI) on the 8-m Gemini South telescope. NICI combines a number of techniques to attenuate starlight and s…
Performance of the Near-infrared coronagraphic imager on Gemini-South
Mark Chun, Doug Toomey, Zahed Wahhaj +8
We present the coronagraphic and adaptive optics performance of the Gemini-South Near-Infrared Coronagraphic Imager (NICI). NICI includes a dual-channel imager for simultaneous spe…
NICI: combining coronagraphy, ADI, and SDI
Etienne Artigau, Beth A. Biller, Zahed Wahhaj +9
The Near-Infrared Coronagraphic Imager (NICI) is a high-contrast AO imager at the Gemini South telescope. The camera includes a coronagraphic mask and dual channel imaging for Spec…
A deep look into the cores of young clusters I. sigma-Orionis
H. Bouy, N. Huelamo, E. L. Martin +9
Nearby young clusters are privileged places to study the star formation history. Over the last decade, the sigma-Orionis cluster has been a prime location for the study of young ve…
Finding ultracool brown dwarfs with MegaCam on CFHT: method and first results
Philippe Delorme, Chris J. Willott, Thierry Forveille +9
We present the first results of a wide field survey for cool brown dwarfs with the MegaCam camera on the CFHT telescope, the Canada-France Brown Dwarf Survey, hereafter CFBDS. Our…
CFBDS J005910.90-011401.3: reaching the T-Y Brown Dwarf transition?
Philippe Delorme, Xavier Delfosse, Loic Albert +9
We report the discovery of CFBDS J005910.90-011401.3 (hereafter CFBDS0059), the coolest brown dwarf identified to date. We found CFBDS0059 using i' and z' images from the Canada-Fr…
CLOUDS search for variability in brown dwarf atmospheres
B. Goldman, M. C. Cushing, M. S. Marley +21
Context: L-type ultra-cool dwarfs and brown dwarfs have cloudy atmospheres that could host weather-like phenomena. The detection of photometric or spectral variability would provid…
Improving the speckle noise attenuation of simultaneous spectral differential imaging with a focal plane holographic diffuser
David Lafrenière, René Doyon, Daniel Nadeau Étienne Artigau +2
Direct exoplanet detection is limited by speckle noise in the point spread function (PSF) of the central star. This noise can be reduced by subtracting PSF images obtained simultan…
Discovery of the Widest Very Low Mass Binary
Étienne Artigau, David Lafrenière, René Doyon +3
We report the discovery of a very low mass binary system (primary mass <0.1 Msol) with a projected separation of ~5100 AU, more than twice that of the widest previously known syste…
A new algorithm for point spread function subtraction in high-contrast imaging: a demonstration with angular differential imaging
David Lafreniere, Christian Marois, Rene Doyon +2
Direct imaging of exoplanets is limited by bright quasi-static speckles in the point spread function (PSF) of the central star. This limitation can be reduced by subtraction of ref…
The size and structure of the spheroid of IC 1613
P. Battinelli, S. Demers, É. Artigau
Nearby galaxies, spirals as well as irregulars, have been found to be much larger than previously believed. The structure of the huge spheroid surrounding dwarf galaxies could give…
Discovery of the brightest T dwarf in the northern hemisphere
Etienne Artigau, Rene Doyon, David Lafreniere +3
We report the discovery of a bright (H=12.77) brown dwarf designated SIMP J013656.5+093347. The discovery was made as part of a near-infrared proper motion survey, SIMP (Sondage In…
C stars in the outer spheroid of NGC 6822
S. Demers, P. Battinelli, E. Artigau
From a 2 x 2 degree survey of NGC 6822 we have previously established that this Local Group dwarf irregular galaxy possesses a huge spheroid having more than one degree in length.…
Ultra-Thin Floating Mirrors
Ermanno F. Borra, Anna Ritcey, Etienne Artigau
We discuss a new technology that promises large inexpensive mirrors. We argue that it should be possible to tilt a rotating viscous liquid by perhaps as much as a few tens of degre…