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The Gemini Deep Planet Survey

We present the results of the Gemini Deep Planet Survey, a near-infrared adaptive optics search for giant planets and brown dwarfs around 85 nearby young stars. The observations were obtained with…
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Discovery of a cool brown dwarf

The discovery of a probable companion to the nearby star G1229, with no more than onetenth the luminosity of the least luminous hydro-gen-burning star, is reported, concluding that the companion is a brown dwarf with a temperature of less than 1,200 K, and a mass ∼20–50 times that of Jupiter.
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Direct Detection of Galactic Halo Dark Matter

A survey to find faint, cool white dwarfs with large space velocities, indicative of their membership in the galaxy's spherical halo component reveals a substantial, directly observed population of oldwhite dwarfs, too faint to be seen in previous surveys, and represents a direct detection of galactic halo dark matter.
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First light of the Gemini Planet Imager

Observations ofBeta Pictoris clearly detect the planet, Beta Pictoris b, in a single 60-s exposure with minimal postprocessing, and fitting the Keplerian orbit of Beta Pic b using the new position together with previous astrometry gives a factor of 3 improvement in most parameters over previous solutions.
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The Spectrum of the Brown Dwarf Gliese 229B

We present a spectrum of the cool (Teff = 900 K) brown dwarf Gliese 229B. This spectrum, with a relatively high signal-to-noise ratio per spectral resolution element (≳30), spans the wavelength range…
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A search for J-band variability from late-L and T brown dwarfs

We present J-band photometric observations of eight late-L and T type brown dwarfs designed to search for variability. We detect small amplitude periodic variability from three of the objects on…
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The Gemini Planet Imager: from science to design to construction

The Gemini Planet Imager (GPI) is a facility instrument under construction for the 8-m Gemini South telescope. It combines a 1500 subaperture AO system using a MEMS deformable mirror, an…
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SPECTRAL ENERGY DISTRIBUTION AND BOLOMETRIC LUMINOSITY OF THE COOL BROWN DWARF GLIESE 229B

Infrared broadband photometry of the cool brown dwarf Gliese 229B extending in wavelength from 0.8 to 10.5 micron is reported. These results are derived from both new data and reanalyzed, previously…
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Tests of the Accelerating Universe with Near-Infrared Observations of a High-Redshift Type Ia Supernova

We have measured the rest-frame B-, V-, and I-band light curves of a high-redshift type Ia supernova (SN Ia), SN 1999Q (z = 0.46), using the Hubble Space Telescope (HST) and ground-based…
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Infrared Spectrum of the Cool Brown Dwarf Gl 229B

Spectroscopic measurements of a cool brown dwarf, Gl 229B, reveal absorption features attributable to methane in the near infrared much like those of Jupiter. These features are not seen in any star.…
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