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Proceedings Paper

Enhancement of the Spitzer Infrared Array Camera (IRAC) distortion correction for parallax measurements
Author(s): Patrick J. Lowrance; Sean J. Carey; James G. Ingalls; Jason A. Surace; Peter Capak; John Stauffer; Chas Beichman; David Shupe; J. Davy Kirkpatrick
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Paper Abstract

The Spitzer Space Telescope Infrared Array (IRAC) offers a rare opportunity to measure distances and determine physical properties of the faintest and coldest brown dwarfs. The current distortion correction is a 3rd order polynomial represented by TAN-SIP parameters within the headers. The current correction, good to 100 mas, was derived from deep imaging, using marginally resolved galaxies in some cases, and has remained stable throughout both the cryogenic and warm mission. Using recent Spitzer calibration observations mapped to HST/ACS calibration observations of 47 Tuc with an absolute accuracy good to 1 mas, we are working towards a possible 5th order polynomial correction that theoretically could allow measurements to within 20 mas. Extensive testing, using observations of 47 Tuc, NGC 6791 and NGC 2264, are underway, after which the new parameters will be used to update all the 3.6 and 4.5um data taken within warm and cryogenic missions. We anticipate if achievable, this new accuracy could be combined with other ongoing enhancements (Ingalls et al, 9143-52) that will permit measurements of parallaxes out to about 50 pc, increasing the volume surveyed by a factor of 100, and enabling new capabilities such as luminosity measurements of the population of young brown dwarfs in the beta Pictoris moving group.

Paper Details

Date Published: 28 August 2014
PDF: 7 pages
Proc. SPIE 9143, Space Telescopes and Instrumentation 2014: Optical, Infrared, and Millimeter Wave, 914358 (28 August 2014); doi: 10.1117/12.2057195
Show Author Affiliations
Patrick J. Lowrance, Spitzer Science Ctr. (United States)
Sean J. Carey, Spitzer Science Ctr. (United States)
James G. Ingalls, Spitzer Science Ctr. (United States)
Jason A. Surace, Spitzer Science Ctr. (United States)
Peter Capak, Spitzer Science Ctr. (United States)
John Stauffer, Spitzer Science Ctr. (United States)
Chas Beichman, Infrared Processing and Analysis Ctr. (United States)
David Shupe, Infrared Processing and Analysis Ctr. (United States)
J. Davy Kirkpatrick, Infrared Processing and Analysis Ctr. (United States)

Published in SPIE Proceedings Vol. 9143:
Space Telescopes and Instrumentation 2014: Optical, Infrared, and Millimeter Wave
Jacobus M. Oschmann Jr.; Mark Clampin; Giovanni G. Fazio; Howard A. MacEwen, Editor(s)

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