The Mauna Kea Observatories Near‐Infrared Filter Set. II. Specifications for a New<i>JHKL</i>′<i>M</i>′ Filter Set for Infrared Astronomy

Tokunaga, A. T.; Simons, Douglas A.; Vacca, William D.

doi:10.1086/338545

Cited by 435 publications

(355 citation statements)

References 15 publications

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“…NICS is equipped with a set of Mauna Kea Observatories near-infrared CH 4 s and CH 4 l filters as specified by Tokunaga et al (2002b) (as shown in Figure 1), and 1024x1024 Rockwell HAWAII-1 HgCdTe detectors.…”

Section: Observationsmentioning

confidence: 99%

49 new T dwarfs identified using methane imaging

Cardoso¹,

Burningham²,

Smart³

et al. 2015

Monthly Notices of the Royal Astronomical Society

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We present the discovery of 49 new photometrically classified T dwarfs from the combination of large infrared and optical surveys combined with follow-up TNG photometry. We used multi-band infrared and optical photometry from the UKIRT and Sloan Digital Sky Surveys to identify possible brown dwarf candidates, which were then confirmed using methane filter photometry. We have defined a new photometric conversion between CH 4 s -CH 4 l colour and spectral type for T4 to T8 brown dwarfs based on a part of the sample that has been followed up using methane photometry and spectroscopy. Using methane differential photometry as a proxy for spectral type for T dwarfs has proved to be a very efficient technique. Of a subset of 45 methane selected brown dwarfs that were observed spectroscopically, 100% were confirmed as T dwarfs. Future deep imaging surveys will produce large samples of faint brown dwarf candidates, for which spectroscopy will not be feasible. When broad wavelength coverage is unavailable, methane imaging offers a means to efficiently classify candidates from such surveys using just a pair of near-infrared images.

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Section: Observationsmentioning

confidence: 99%

49 new T dwarfs identified using methane imaging

Cardoso¹,

Burningham²,

Smart³

et al. 2015

Monthly Notices of the Royal Astronomical Society

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“…In Table 1 we list the objects along with MKO magnitudes (Tokunaga et al 2002) and near-infrared (hereafter NIR) spectral types. The NIR spectral type classification follows the scheme described in Burgasser et al (2006a).…”

Section: Observations and Reduction Proceduresmentioning

confidence: 99%

Parallaxes and physical properties of 11 mid-to-late T dwarfs

Marocco

Smart

Jones

et al. 2010

A&A

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Aims. We present parallaxes of 11 mid-to-late T dwarfs observed in the UKIRT Infrared Deep Sky Survey. We use these results to test the reliability of model predictions in magnitude-color space, determine a magnitude-spectral type calibration, and, estimate a bolometric luminosity and effective temperature range for the targets. Methods. We used observations from the UKIRT WFCAM instrument pipeline processed at the Cambridge Astronomical Survey Unit. The parallaxes and proper motions of the sample were calculated using standard procedures. The bolometric luminosity was estimated using near-and mid-infrared observations with two different methods. The corresponding effective temperature ranges were found adopting a large age-radius range. Results. We show the models are unable to predict the colors of the latest T dwarfs indicating the incompleteness of model opacities for NH 3 , CH 4 and H 2 as the temperature declines. We report the effective temperature ranges obtained.

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“…Filters in the collimated beam are inclined by 5Њ to prevent "narcissus" ghost images from being refocused onto the detector. The other filter wheel in the converging beam is less susceptible to this type of ghost images and is therefore used for filters that were not designed for a 5Њ tilt, in particular for the "Mauna Kea standard" broadband filters (Tokunaga, Simons, & Vacca 2002).…”

Section: Camera Opticsmentioning

confidence: 99%

The Gemini Near‐Infrared Imager (NIRI)

Hodapp¹,

Jensen²,

Irwin³

et al. 2003

PUBL ASTRON SOC PAC

285

234

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ABSTRACT. This paper presents the basic design of the Gemini Near-Infrared Imager (NIRI) and discusses its capabilities. NIRI offers three different pixel scales to match different operating modes of the Gemini telescope and allows polarimetric and spectroscopic observations. It is equipped with an infrared on-instrument wave-front sensor (OIWFS) to allow tip-tilt and focus correction even in highly obscured regions. The science detector array is an Aladdin II InSb pixel device sensitive from 1.0 to 5.5 mm. 1024 # 1024

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The Mauna Kea Observatories Near‐Infrared Filter Set. II. Specifications for a NewJHKL′M′ Filter Set for Infrared Astronomy

Cited by 435 publications

References 15 publications

49 new T dwarfs identified using methane imaging

49 new T dwarfs identified using methane imaging

Parallaxes and physical properties of 11 mid-to-late T dwarfs

The Gemini Near‐Infrared Imager (NIRI)

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