TRIDENT: an Infrared Differential Imaging Camera Optimized for the Detection of Methanated Substellar Companions

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A near-infrared camera in use at the Canada-France-Hawaii Telescope (CFHT) and at the 1.6-m telescope of the Observatoire du Mont-Megantic is described. The camera is based on a Hawaii-1 1024 x 1024 HgCdTe array detector. Its main feature is to acquire three simultaneous images at three wavelengths across the methane absorption bandhead at 1.6 {micro}m, enabling, in theory, an accurate subtraction of the stellar point spread function (PSF) and the detection of faint close methanated companions. The instrument has no coronoagraph and features fast data acquisition, yielding high observing efficiency on bright stars. The performance of the instrument is described, ... continued below

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PDF-file: 43 pages; size: 0.8 Mbytes

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Marois, C; Doyon, R; Nadeau, D; Racine, R; Riopel, M; Vallee, P et al. April 8, 2005.

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A near-infrared camera in use at the Canada-France-Hawaii Telescope (CFHT) and at the 1.6-m telescope of the Observatoire du Mont-Megantic is described. The camera is based on a Hawaii-1 1024 x 1024 HgCdTe array detector. Its main feature is to acquire three simultaneous images at three wavelengths across the methane absorption bandhead at 1.6 {micro}m, enabling, in theory, an accurate subtraction of the stellar point spread function (PSF) and the detection of faint close methanated companions. The instrument has no coronoagraph and features fast data acquisition, yielding high observing efficiency on bright stars. The performance of the instrument is described, and it is illustrated by laboratory tests and CFHT observations of the nearby stars GL526, {nu}-And and {chi}-And. TRIDENT can detect (6{sigma}) a methanated companion with {Delta}H = 9.5 at 0.5'' separation from the star in one hour of observing time. Non-common path aberrations and amplitude modulation differences between the three optical paths are likely to be the limiting factors preventing further PSF attenuation. Instrument rotation and reference star subtraction improve the detection limit by a factor of 2 and 4 respectively. A PSF noise attenuation model is presented to estimate the non-common path wavefront difference effect on PSF subtraction performance.

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PDF-file: 43 pages; size: 0.8 Mbytes

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  • Journal Name: Publications of the Astronomical Society of the Pacific; Journal Volume: 117

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  • Report No.: UCRL-JRNL-211524
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 875370
  • Archival Resource Key: ark:/67531/metadc878989

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  • April 8, 2005

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  • Sept. 21, 2016, 2:29 a.m.

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  • Dec. 2, 2016, 4:21 p.m.

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Marois, C; Doyon, R; Nadeau, D; Racine, R; Riopel, M; Vallee, P et al. TRIDENT: an Infrared Differential Imaging Camera Optimized for the Detection of Methanated Substellar Companions, article, April 8, 2005; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc878989/: accessed August 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.